How to Recalibrate the iPhone Battery
Jeremy Laukkonen is automotive and tech writer for numerous major trade publications. When not researching and testing computers, game consoles or smartphones, he stays up-to-date on the myriad complex systems that power battery electric vehicles.
Jerrick Leger is a CompTIA-certified IT Specialist with more than 10 years’ experience in technical support and IT fields. He is also a systems administrator for an IT firm in Texas serving small businesses.
What to Know
- The iPhone’s calibration tool (iOS 14.5 and up) runs automatically, but you can check its status in Settings Battery Battery Health.
- You can recalibrate older iPhones by draining the battery, fully charging it, and immediately restarting the phone.
This article explains how to recalibrate the iPhone battery using Apple’s battery recalibration tool. It also explains the old style of battery calibration.
How to Recalibrate the iPhone Battery
Apple released a battery calibration tool alongside iOS 14.5 which you can use to recalibrate your battery. If you don’t have iOS 14.5 or newer, you’ll have to update your operating system before using this tool.
If your phone is fully updated and has the battery recalibration feature, it will run automatically and help improve your battery life over time. You can check its progress at any time in the battery health section of your iPhone settings.
According to Apple, the recalibration capability for the iPhone battery is only available on iPhone 11, iPhone 11 Pro, and iPhone 11 Pro Max to address inaccurate estimates of battery health reporting for some users.
Here’s how to use the iPhone battery recalibration tool:
Tap Battery.
Look for Important Battery Message at the top of the display for information about the battery recalibration process on your phone.
If you don’t see a message, come back and check later. The calibration process is automatic, and it can take a while.
How Does iPhone Battery Recalibration Work?
The battery calibration tool introduced with iOS 14.5 calibrates your battery automatically, so you don’t need to turn on the feature. The calibration can take weeks, and even then, it’s an ongoing process. If you don’t see a message about the status of your recalibration, check back later. As it recalibrates your battery, you will see your Maximum Capacity and Peak Performance Capability change to reflect the actual status of your battery.
How to Calibrate Other iPhone Batteries
The iPhone battery calibration tool isn’t available for all iPhones, but another iPhone calibration process has been around a lot longer. This process requires you to fully drain the battery, which can be harmful to lithium-ion batteries like the ones found in iPhones. With that in mind, you should only use this calibration process if your battery life is already low, and you should only do it occasionally. If you only calibrate your battery every few months or when your phone needs it, the benefits you see from calibration should outweigh the potential harm done by allowing the battery to die completely.
If your phone has an automatic calibration tool, do not use this process. Allow the calibration tool to do its job, even if it seems slow.
Here’s how to calibrate an older iPhone battery:
How to calibrate the battery on your MacBook
The battery on your MacBook, MacBook Air, or MacBook Pro isn’t like any other battery. It’s a highly sophisticated piece of technology that knows exactly when to charge your Mac. It also detects and notifies Mac users how much time is left before the device turns off based on their current usage. When your Mac is new, the battery is calibrated and able to perform all those functions. But the used battery needs to be re-calibrated now and then. And in this article, we’ll show you how you can do it.
Why calibrate the battery on your MacBook?
Click the battery menu, and you’ll see an indication of how many hours and minutes you have left before your Mac’s battery runs out of charge. Or go to System Settings, click Battery and take a look at the options. But all that information and customization is only accurate if the battery is calibrated correctly. If not, the information may be incorrect, and the customization options won’t work as you expect.
How to calibrate your Mac’s battery
On newer MacBook Airs and MacBook Pros, calibration happens automatically. All you have to do is occasionally allow your battery to run down to zero and power off your Mac. Then power it back on and let it charge to 100%. The battery will recalibrate. On older models, the process is a bit more involved.
- Fully charge your MacBook’s battery while you’re not using it. Then, wait until the light on the MagSafe connector has turned green. Once it’s charged, start using your Mac while it’s still plugged into AC power. Use it like that for two hours. When two hours have passed, unplug your MacBook. Then, keep using it while it runs on battery power until you get a warning telling you that power is running low.
- When you see the warning, save your work and keep using your Mac until it goes to sleep. After that, hold down the power button to turn it off.
- Wait at least five hours, and plug it in again. Then, wait for it to fully recharge.
The battery is now re-calibrated. The information you see in the battery menu bar item and System Settings should be accurate.
How to reduce the battery power your Mac uses
You can do several things to reduce the power your Mac uses to preserve battery life. The first thing you should do is pay a visit to the Battery pane System Settings (or Energy Saver in pre-Big Sur versions of macOS). Use the options there to lower screen brightness when your Mac runs on battery power and set your display to go to sleep more quickly.
Here are a few other things you can do:
Disconnect peripherals you’re not using
If you have an external hard drive or USB stick plugged into your Mac, and it doesn’t have its own power source, it sucks power from your Mac. And if your Mac isn’t plugged in, it uses battery power. The same is true for USB microphones, webcams, etc.
Close browser tabs
Every open browser tab consumes CPU cycles, meaning it uses power. If you have dozens of tabs open, that puts significant pressure on your battery.
Use the battery menu bar item to identify greedy apps
Click the battery menu bar item, and you’ll see it displays apps that are overusing battery power. If you’re not using the apps listed, quit them. And even if you are, it’s worth restarting them if something causes them to use that much energy.
Get rid of unnecessary login items and launch agents
Apps and processes that launch when your Mac boots run in the background and consume your Mac’s power. The rule is simple: if you don’t need them, get rid of them! And here’s a simple way to do it.
The most effortless way to remove login items and launch agents is to use CleanMyMac X’s Optimisation module:
- Download CleanMyMac X and launch the app.
- Choose Optimization in the sidebar.
- Select View All Items.
- Check the boxes next to Login Items and Launch Agents and press Remove.
Once it’s finished, all login items and launch agents will have been removed. CleanMyMac X can also uninstall applications you don’t need. Alternatively, it can reset them to their default state, if they have started to misbehave, consuming too much energy.
Your Mac’s battery is intelligent. It can tell you how long it has left before it’s out of charge and even optimize its charging schedule based on your usage. However, to do all that, it needs to be calibrated, and occasionally that might involve stepping in to do it manually. Follow the steps to keep your Mac’s battery in top condition for as long as possible.
How To Calibrate Your Battery For Optimal Use
When a battery is first used, or after it has been left unused for a period of time, it needs to be calibrated. This process ensures that the battery is able to store and deliver the correct amount of charge. To calibrate a battery, the first step is to discharge it completely. This can be done by running a program that will use up all of the battery’s power. Once the battery is completely discharged, it needs to be recharged to 100%. This can be done by either plugging the device into a power outlet, or by using a separate battery charger. Once the battery is fully charged, it is ready for use. However, it is important to note that the battery will need to be calibrated on a regular basis. This is because over time, the battery will become less accurate in terms of its charge level. As a result, it is important to recalibrate the battery every few months to ensure that it is working properly.
You can prolong the life of your laptop battery by performing simple calibration. In this article, we’ll show you how to calibrate your battery quickly and easily. Once the work is finished, you will receive nearly an hour of battery backup and no downtime. It is recommended that you calibrate your laptop’s battery once every three months. In most cases, if you’re using your laptop solely to calibrate the power, you should have it calibrated once a month. You can ensure the accuracy of your laptop’s battery life indicator by performing an accurate battery calibration. By doing so, you gain a better idea of when to recharge.
If your laptop battery does not hold a charge like it used to, it could be time to calibrate it. With this improvement, the battery level indicator’s accuracy can be increased and its life can be extended. Because calibration can take several hours, ensure you have plenty of time to do it. Most other laptops use software calibration systems to calibrate their batteries, but the MSI laptops use a hardware calibration system. As a result, the battery calibration data is stored on the laptop rather than in the operating system. To change calibration data on a laptop without first opening and replacing the battery, a physical inspection of the machine is required. The MSI battery calibration app can be used to calibrate your laptop’s battery.
This can help prolong the life of your battery and ensure that it is accurate in its readings. The Battery Saving mode on MSI laptops is the best option. This method will help to reduce your laptop’s power consumption while extending its battery life. If you’re running Windows 11, go to Settings and then Battery. A third-party tool, such as BatteryInfoView, can also be used to check your battery’s health. The free tool contains a wealth of information about your battery and allows you to easily identify its health. In order for the laptop battery to be properly calibrated, it will take about two hours.
The battery of your laptop should be calibrated in order to extend its lifespan. This post will walk you through the steps required to ensure that your battery is properly calibrated and working properly. The simplest way to calibrate your MSI laptop battery is to plug it in and let it charge until it is completely depleted. If your laptop’s battery isn’t holding a charge as it used to, or it isn’t running smoothly, it might be time to replace it. By performing this procedure, you can greatly extend the battery life and performance.
Users who use their laptops primarily to power up the battery are advised to check it once every three months. If you travel frequently or occasionally interchange between power and battery modes, it is recommended that you run Battery Calibration once a month.
Your laptop battery is not difficult to precisely calibrate; simply running it to near-empty and then charging it all the way back up to full capacity is the process, and some PC manufacturers even offer utilities that do this for you.
What Does Battery Calibration MSI Do?
Battery calibration helps ensure that your laptop’s battery is accurately reporting its charge level. Over time, batteries can become inaccurate, displaying a full charge when they are only half-full or vice versa. This can lead to your laptop unexpectedly shutting down due to low battery power. Calibrating your battery regularly can help avoid this problem.
It simply calculates how much power remains in your battery and uses that information to adjust screen brightness, network activity, and other settings on your Android device. Because your battery does not provide the best performance, this is essential. Even if you don’t use your phone, it can lose power even if you don’t use it. As a result, by calibrating your battery, you can help your Android OS adjust settings to ensure that your phone runs smoothly and lasts longer by keeping your battery level in check.
MSI Battery Calibration: The Easiest Way To Get Accurate Battery Readings
Using theMSI Battery Calibration software, it is simple to easily calibrate your laptop’s battery. It helps to ensure that battery readings are accurate in regard to how much juice is left in the battery. It can take a few hours to calibrate, but it will be well worth it in the long run.
How Long Does It Take For MSI Battery Calibration?
To calibrate a MSI laptop battery, it should take about three hours to fully charge the battery. After the battery is fully charged, it should be left plugged in for another two to three hours. This will help condition the battery and ensure that it can hold a charge for a longer period of time.
If the MSI Battery Calibration is not performed, it can harm the battery’s capacity or service life. It is critical to allow the battery to run from 100% to almost 100% before returning it to 100% by charging it all the way up to 100%. It is recommended that laptops connected to the power supply be calibrated once every three months. MSI laptop batteries perform admirably in our most demanding tests. The battery’s life expectancy increases as a result of charging it 24 hours a day. If you are charging your laptop, you can play games while it is fully charged. If you play GPU-intensive games on a laptop’s battery power, it will be damaged over time.
If your phone has any hardware problems, such as a faulty battery, you will be unable to perform the factory reset. It is critical to connect the laptop to the power supply and allow it to turn 100% before unplugging it and waiting for the shutdown. Some PC manufacturers offer utilities for simplifying the process of determining your laptop’s battery life.
How Long Does A Laptop Battery Calibration Take?
The battery should be allowed to rest for at least two hours before fully charged. During this time, a power adapter can be used to keep your computer running.
The Advantages And Disadvantages Of Lithium Ion Batteries
Despite the fact that lithium ion batteries have numerous advantages over traditional battery types, they are frequently regarded as a modern marvel. This type of battery is frequently regarded as environmentally friendly because it produces no harmful emissions when used. Furthermore, lithium ion batteries are frequently thought to be more durable than traditional batteries. Some of the disadvantages associated with lithium ion batteries are similar to those associated with other types of batteries. One of these is that they must be calibrated on a regular basis in order to stay competitive. It is especially true when the battery is rarely completely discharged in an emergency. A Li-Ion battery can be calibrated once every three months for general use. A battery that is frequently not completely depleted should be calibrated once a month.
What Happens If I Cancel Battery Calibration?
Your device may appear oddly if you do not calibrate it; your device will be unable to read the battery percentage, and it will most likely shut down abruptly even after the new battery is half-charged or nearly dead.
How To Calibrate Your Laptop Battery
During this procedure, your battery is always being charged to maximum capacity, and it can also assist you in identifying any issues with your battery. When your battery runs out of power or is unable to hold a charge, for example, calibration may be required to restore its full power. As a result, if you’re having problems with your laptop battery, you might want to calibrate it.
How Does Battery Calibration Work?
A simple method for restoring your battery is to remove it from 100% capacity and almost completely remove it from charging. A power meter will tell you how long the battery is actually alive and give you a better idea of how much battery capacity is still available.
It is impossible to predict how much energy a battery is capable of storing at any given moment. New full charge and full discharge anchors can be used to ensure accurate estimates. A battery health management feature on Apple MacBooks with Thunderbolt 3 ports running macOS Catalina (10.15 or later) or later prevents them from being fully charged. To calibrate, a full charge, discharge, and charge are applied. The process is carried out in equipment or via a battery analyzer, depending on the type of battery. The only way to calibrate a battery is to drain it below 10%. The same can be said for giving someone a broken fuel gauge and instructing them to drive until the tank fills up.
Software may claim a near zero battery charge if the chemical state of the battery is closer to 10%. The goal of this procedure is to prevent the battery from ever falling below a safe level. If you want to be certain about all of this, you can check Apple’s official battery calibration procedure.
If the battery on your Switch is not calibrated properly, try draining it until the system turns off on its own, then charge it for at least 5 hours before turning it off. This should result in a system reset and the proper charge level being restored.
Does Battery Calibration Apps Work?
Does a calibration app for Android work? They only delete calibration data on your phone. It will then attempt to rebuild the file from scratch, unaware of previous usage and charging characteristics.
How to calibrate your laptop’s battery and fix inaccurate wear info
The issue I’ve been coming across recently seems to be mostly with Dell’s XPS line of laptops, though it can certainly affect others: My new XPS 13 9370, XPS 15 9575, and XPS 15 9570 showed 8, 14.5, and 10% battery wear out-of-the-box, respectively (a battery wear of 10% means that the battery is only able to charge to about 90% of its rated capacity).
Normally, batteries will only show this much wear after a year of heavy usage, and it isn’t something you should accept in a new laptop. I realized something was up when every single XPS 15 I checked out new had around 10% battery wear reported, however. Warning: lithium-ion batteries should generally not be fully discharged as this cause real wear to the battery. Thus, battery re-calibration should only be conducted sparingly when you suspect a problem with the way the battery reporting its capacity.
Battery calibration hasn’t been much of a necessity since lithium-ion batteries got so much smarter over the past few years. Thus, even as someone who considers themselves to know quite a bit about notebooks, properly calibrating the battery in my new XPS laptops (showing incorrect wear percentages out of the box) was something I had to do a bit of reading up on combined with some trial and error to get right, and so I thought I would write a brief guide on how to do it right the first time.
Following this protocol, I was able to reduce the reported wear levels significantly to the low single-digits and recover a good deal of battery life.
Checking your battery’s reported wear
Before bothering with a calibration, it’s necessary to check the reported health of your battery. If your battery is new and showing less than 95% of its original capacity then it is probably worth recalibrating.
Go to the Start menu and search “cmd” to show the Command Prompt (PowerShell will do fine as well). Right-click the search result to run your choice of app as an administrator. Copy and paste the following line into the command line: powercfg /batteryreport
The battery health report will be output to the Windows\system32 folder by default.
Copy the directory path and paste it into your favourite web browser to view it. Once it opens, you can scroll down a bit and you should see your battery’s health as a function of design capacity (rated capacity) and full charge capacity (actual amount the battery reports it is able to hold).
After calibration. Before calibration, the full charge capacity was only 87,000 mWh, or less than 90% of advertised.
By doing some quick math you should be able to see how healthy your battery currently is. Technically it is not good to fully charge and discharge a Li-Ion battery often (which is what calibration requires), so if your battery is not new and the wear percentage seems reasonable, it may be best to leave it. If you see only 90% of capacity on a new laptop, however, then this guide will definitely help.
Step 1:
First, you will need to let your laptop charge to its “full” capacity. OEMs like Dell and Lenovo allow the user to set charging-thresholds on the battery in order to preserve the battery health (this is a very good practice that I encourage all OEMs to follow). Thus, to charge the laptop fully, you’ll need to find that setting and set your charging threshold temporarily to 100%. On XPS machines, this is done through Dell Power Manager or the BIOS.
You’ll need to set the charging behavior to “Standard” or change the slider manually to 100% to complete the first step. Once this is done, make sure your laptop is plugged-in and allow it to charge completely.
Step 2:
Next, you need to let the battery completely discharge until forced shut-off (not just hibernation). There are a few ways to do this, but my favourite method is the simplest: Restart the laptop in BIOS mode, then go out of the house for the day. With this method, you don’t need to worry about the laptop going to sleep or hibernating as these features are not enabled when viewing the BIOS. Additionally, power-saving states are not enabled for the CPU when in the BIOS either, meaning the laptop will run down significantly faster than it would in Windows under normal usage.
You could also use the laptop normally and let it run down until it automatically hibernates, then leave it in BIOS as described above as well. This requires your turn off all of the sleep and hibernation timers in the Power Options control panel first, however.
Step 3:
WAIT. Do not immediately charge the laptop; be sure the laptop has been sitting cool and unplugged for 3-5 hours before the next step. Failing to perform this step can result in making your reported battery wear worse.
Step 4:
Plug the laptop in and let it charge to maximum uninterrupted. You should be able to use the laptop in Windows at this point, but I let it charge in BIOS out of superstition. When you generate your battery report again, you should (hopefully) see a much higher rated capacity for your new battery.
Conclusion
That’s it! Using this method I was able to reduce my 9575 reporting 14% wear down to 4%, my 9570 reporting 10% down to 3.8%, and my 9370 reporting 8% wear down to 4%, and I hope it fixes the problem for you simply as well. As always, try to practice good battery care to prolong their lives: Keep them cool, don’t run them dry, and don’t charge them to maximum often. If you are interested in reading more about safety and care for Li-Ion batteries, you can check out this guide for further reading.
Did you also get an XPS laptop with double-digit battery wear? Please share your results in the Комментарии и мнения владельцев.
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Article by: Douglas Black Douglas Black. Editor. Douglas is a technical writer, educator, DJ, and music producer based in Florida, USA.
77 Комментарии и мнения владельцев
Absolutely — the lack of QC is, imo, one of the main reasons why companies like Apple can exist despite being noncompetitive in almost every other arena. I would guess that whoever has been supplying their batteries is the same company for all 3 XPS machines, thus why they all have incorrect wear/capacities.
Absolutely! Apple charges for looks and brand name, rather than functionality or features. case in point is the MacBook, which has seen nothing by way of change in donkey’s years! I used a MacBook Pro (15) way back, unning on Panther or something. Sure, the Wi-Fi connected before I knew what was happening, the Machine was beautiful (though obscenely heavy compared to my IBM ThinkPad) and the illuminated Apple Logo was cool… However, I missed my favourite Apps, missed my favourite Games (I used to be something of a gamer back then) and the familiar Menus and Colours of Windows!! After 6 months usage (it was provided by the Office), I returned it for a HP. I was soo relieved! The guy who was allotted my MacBook was pleased as punch too, as I had maintained it scratch-free, in mint condition!! That was the last I ever wished for an Apple – Phone, Pad, Laptop of Desktop!!
Hello, I have a 10 months old premium Lenovo notebook (Yoga c930). First battery was replaced after just 2 months with wear level of 6%. Second battery is already at 26% wear. I have tried recalibration, but Lenovo is kind of now ignoring me because Lenovo Vantage says battery is in Good condition. I guess they dont care for wear level! This battery is inside for 6 months and it seems I have lost 1/4 of its capacity already. In my opinion this is just crazy, especially for such expensive device. Any Комментарии и мнения владельцев?
That sucks. I’d press for a replacement if that’s included in your Warranty package, 26% wear in half a year is awful.
I plugged in my battery and overslept, today. When I woke up my battery’s wear level went from 0% to 3%. I have a new zephryus g14 bought a month ago. Shall I follow this tutorial or should I wait to see if the wear percentage in the next couple of days increases?
I think that’s small enough that it’s probably accurate and there’s no need to follow this guide at this time.
worked for me perfectly on my new xps 9570. from 87 to 93mWh. If i repeat this process, will i get to 97mWh at some point or is 93 the best result i can get for my battery and it will only get worse from this point?
As far as I know, it shouldn’t get worse, so you could try it one more time, but it won’t probably do much. 93/97 is not bad though. Update: Also see Kirikshi’s the reply below.
That is not true, as any Li-Ion battery is very susceptible to complete discharge. It is said to resist quite low (1-2 dozens) of complete harsh discharges (as in the article) till its completely dead in terms of residual capacity. So, this experiment (albeit it can help with the calibration) is not a fortnight trick. No one promised that following complete discharge will damage battery (decrease capacity) less, than it rescales the calibration. Another reason not to risk – Li-Ion batteries show thermoelecric effect – voltage of a unified battery depends on temperature. (example: https://www.nature.com/articles/ncomms4942#f1) As a result, if you drop your charge to critical level and afterwards your laptop battery cools down – it goes below critical level, damaging the cell. All of this means that the procedure, even if it leads to calibration with winning around 5-10% of capacity, shouldn`t be implemented often (more than 4-5 times for the battery life).
That is correct — I hoped I made it clear in the article not to do this unless your battery should be brand new but is showing unusual wear (such as the case with many Dell laptops).
Thanks, you’re right, I was only suggesting performing this one more time. I’ll edit the initial reply to make it more clearly.
Turn on the computer and immediately press the F2 key repeatedly, once every second until the HP PC Hardware Diagnostics UEFI menu displays. Click Component Tests in the main menu.
Thanks for this article. I’m here because of my Dell XPS 15 9570, FullHD, 97Wh. The first weeks the battery last about 8-10h with my use case which look like this: 60% Videos/Streams via LAN 25% Office Work 10% Music via external speakers 05% Gaming After about ten weeks, the battery only last about 4-6h with the same use case. So, I just have done the cmd step, and the battery has a full charged capacity of 77Wh, compared to 97Wh! After ~twelve weeks just 80%! of the capacity is left. I hope with the steps the capacity will increase again, if not this was the first and last time buying such an expansive notebook from Dell…
So, after 2.5 days, and about 6.times repeating the steps 1-4, the battery is now mostly healed. From 77Wh to 89Wh in just a short time. I also know what one problem was. Like with the smartphones-batteries, I thought it would be okay to charge my notebook at about 15-20% up to 97-100%. But this notebook looks like it does not work with this way of charging. But, in my opinion the notebook should handle this kind of charging in a better way. I mean, I can not wait everytime to charge up to 100% and then leave my flat. Thank you for this steps, saved my money for a new battery ;).
Just repeated this process 3 times with my 9575, but unfortunately my battery went from 13% of wear (laptop is only 4 month old and was shipped with 5.7%) to 23%. I discharged it from the full state in BIOS. Then I waited for 5-13 hours to discharge more and then didn’t touch it when it was charging. What am I doing wrong? BTW the time I switched from charging from max 94% to 100% (and started using Manjaro Linux) I saw a drop in a capacity to that 13%, I’ve previously mentioned. BIOS 1.2.0 (latest)
Hi, I ve been checking the actual capacity, and it fell from 96000mah out of the box, till 88000, about 2 months later. The weird thing is that now after a full charge, I disconnect it and it inmediately drops from 100 to 95, or 98 in today’s case. I did this calibration yesterday but didnt solve the problem!
That sounds like it’s what you’re battery’s actual capacity is. It isn’t great but not malfunctioning yet
My 9575 on 1.2.0 BIOS (don’t know if that matters) after 3 of these procedures went from 13.5 to 21.5 battery wear? I charged the laptop to 100% then opened BIOS and sit there till it powers off. Then I waited 5-10 hours and plugged back in to charge to 100%. Every time I opened the OS the battery capacity slowly had gone out. What am I doing wrong? Laptop is only 4 month old and was shipped with 5.7% wear.
sorry for the late reply. I would suggest calling for a new battery before your laptop is 6 months old – you may really have 21% battery wear, and batteries are usually only covered for the first 6 months of warranty. Tell them it’s at 21.5% wear and it’s running out much too soon, and they should help you out with a new one.
I did so as you mentioned.but the wear level increased to 20% from 14% dell 4 cell 41mah battery purchased before 1 week. At first recharge wear level was 5% and my lappy automatically goes to hibernate at 37% and suddenly it show 8% then after wear level increased to 14 and now it’s 20. Backup is approx 3 hours all settings are normal. Did I got the defective piece…it’s nearly 4 months old manufactured as mentioned on box. I conslulted dell they took several tests and all tests were cleared successful…and told me to charge discharge some more cycles for stability. Should I opt for replacement as the retailer gives me full 1 year warranty at his shop. Can you suggest me what should I do….thanks
Sorry for the late reply! If you have a new battery with 14% wear that re-calibrated to 20%, I would return it to the shop indeed.
There is no way to keep the 9370 (XPS 13) from turning off at critical battery level (which cannot be set lower than 2% in advanced power settings) even if I am in BIOS. I keep turning it on and then it turns off after booting up again and again. I don’t know if this impacts the calibration process. I calibrated it a week ago and gained 10% capacity (design is 52Wh and it had increased to nearly 48Wh) but three days later it dropped to 41Wh so I hesitatingly, as attempting it once more. One other question, the 9370 BIOS allows me to set charging between 50 and 90%. But when I do that it stops at 90%, gives me the message plugged in not charging but never leaves 90%. So it doesn’t discharge down to 50% ever. Turned that off after a day setting at 90%. Is this a problem with Modern Sleep or can I change something in registry? I tried asking this on Dell without any luck.
I did the steps from 1 to 4 for my XPS 9570 and I managed to decrease the wear from 10% to 4,3% (from 87MWh to almost 93Mwh). It is crucial to leave you laptop discharged for 3-5 hours before charging it again to full capacity.
Hi, First of all I would like to thank you for the guide. Unfortunately it has not been helpful for me. The battery in my X1 Extreme went down from 75MWh to 72MWh. Its design capacity is 80MWh and it only has 25 recharge cycles so far. I also mostly use the laptop plugged in with a 80% threshold activated. Does this mean my battery is faulty and should I file a claim for a new one? Or should I try to recalibrate the battery one more time? Thanks so much, your support is greatly appreciated.
Batteries are so mercurial that I almost feel like recalling this guide. I’ve successfully re-calibrated batteries with this process quite a few times, but mostly from Dell. Lenovo seems to play on the conservative side with their firmware (batteries included) I think, in order to keep things more reliable. Just a theory. After 25 cycles and you’re at 72Wh though, I’d try recalibrating once more (leave it a good while to cool off before charging) before trying for a new battery.
Hi Douglas, Thanks so much for your quick reply. Will recalibrate one more time before trying for a new battery then. Thank you!
I would maybe edit the guide to add a big bold warning at the beginning along the lines of: Generally this process should only be performed once, and only if you believe you believe the indicated degradation is inaccurate. It will NOT improve a legitimately worn battery. I would hate to see the guide recalled since it is a great resource.
Hi ,two days before I had a sudden battery failure. The first time that I did the recalibration to the battery following these steps I had a 0% wear and after 8 months of use my battery was at 94WHr / 97 Whr. After changing the battery I tried yesterday to calobrate my battery but I dont remember what I have done in the past. So yesterday I let it fully discharged after replacing the battery. Then recharged to full after 5 hours. Today I used the laptop and I let it to fully diacharged again and I charged it to 100% but the battery is 93Whr / 97. Will be a problem if I repeat the steps again – one more time ?
Worked for me the first time. In the very beginning I could get some wear levels going down. But now after repeating the process, every time I let the computer completety discharge in BIOS it only gets worse. I am repeating the process each month and my wear level that was at 6% is at 16% now. So I won’t do it again. Ever…
Don’t keep doing it. It’s likely that is the actual wear on your battery. This process is takes a toll on your battery and I wouldn’t do it unless you have a reason to think the battery wear is inaccurate
Worked great on my Dell Precision 5530. Went from Full Charge Capacity of 87,500 mWh (out of 97,003) to 93,275, or 9.8% degradation to 3.8%. Big improvement. Thanks for writing this up.
My battery have 92.5% health out-of-the-box ( vostro 7590 ). How do you think – will dell change this battery?
If you should be an explorer, a soldier, a solo sailor, a woodsman, or just an out side person on your own, NEVER use a Smart Battery It could kill ya with all kinds of power still available to keep your work going. Not a choice for the Military or Arctic. DELL Battery is a 11.1 Volt 53Watt Li. for the 9 Pin Dell connector. Dell D5318 4800 mAH. Test battery is a fake mail order Model 6000 reported as: 54SanyoDELL 00 and with a rating 11.1V 5200mAh /58Wh that is really a : 10.8 Volt 10,800mAh / 38.8 Wh battery. The 3.6 volt cells are over charged to 4 volts in use. 4.00 volts per cell is 100% (NOTICE 4.02volts will trigger the battery FET thermal kill of fuses!) 3.86 volts per cell is 80% reported by LEDs; BIOS at 71% charge; Windows at 72% charge. 3.80 volts per cell is 60% reported by LEDs. 3.75 volts per cell is still 60% 3.70 volts per cell is still 60% 3.60 volts per cell is still 60% 3.52 volts per cell is still 60% [I stopped the load test here]. New tests on a 47 ohm load wired inside the battery: show (Running on load resistor all day some 20 hours at 60% showing in the test LEDs.) 3.92 [start] – 3.8 [mid test] – 3.5 [end test] volts per cell LED reports all at 60% charge. LapTop Diags (from Dell CDROM) report 4.02 volts at cells is 100%. LapTop Diags (from Dell CDROM) report 3.91volts at cells is 50%. Thus the Laptop reports a drop of 0.11 volts is a 50% drop in charge! The Battery LEDs show a drop of 0.4 volts is a 20% drop in charge! Bench measurements show a drop of 0.4 volts from a 108% charge is Still 100% charged! My conclusion is that the BIOS and Windows battery programs are NOT measuring the charge of the Battery
thanks for the article ! i got a dell ispiron 2 in 1 7391 since last thursday. initial wear was 8% and now it’s 4%. i understand it’s a good wear so i am not going to try again. at least now but maybe in future
How to Calibrate an iPhone Battery 2023
Poor battery life is a long-standing complaint among smartphone users. It doesn’t matter if you’re an iOS or Android user; if you use your phone often, the battery is prone to conditions. You can find kinds of questions about iPhone battery performance online.
Your iPhone battery perform will not as well as it used to over time. To fix this, you need to calibrate your iPhone battery to get an accurate percentage. Here you can learn tips on how to calibrate iPhone battery issues.
What is battery calibration?
iPhone battery calibration is also known battery resetting. The user’s battery percentage readings are often inaccurate and unstable, and the faster the battery is drained, the shorter the battery life will be. If your iPhone suddenly shuts down when the battery life percentage hits single digits, you can conclude that the timing calibration is poor. Battery calibration is a way to correct erroneous battery statistics and display incorrect battery times.
Do iphones need calibration?
Many factors may cause issues with battery calibration, such as software updates, app refreshes, new features developed on the phone, and even ordinary daily use can cause discrepancies.
Calibrating battery ensures two things.
Helps software calculate the range of battery life.
Steps to calibrate your iPhone
Prepare to Calibrate iPhone Battery
Before starting the calibration process, you should take some preparatory steps. They all revolve around disabling features and services so that tasks consume as little power as possible. This will help get accurate readings later in the process. After resetting the battery, you can re-enable all of these options.
Calibrate iPhone battery
Now you’re ready to calibrate your iPhone battery. Please be more patience; It’ll need several full charge/discharge cycles to complete.
Drain iPhone battery completely
Drain the iPhone battery completely, make sure there is no battery power left. The right way is to play the video, or just leave the iPhone aside without doing anything until it runs out the power and turns off automatically. Turning on the flashlight and turning up the screen brightness is also a good way to drain power.
Fully charge your iPhone
Plug your iPhone into the charger without interruption until it shows a maximum of 100% battery. Continue charging for another two hours. NOTE: Please use the original or an Apple certified cable and charger
Reboot your iPhone
Reboot your iPhone and repeat the whole process again
Follow the same guidelines as before. Note that this will takes you a lot of patience; you’ll need to wait several full charge/discharge cycles for it to complete.
After all
Re-enable previously disabled services and features. Turn location services, background refresh and auto-updates back on, and turn up screen brightness
How often should you calibrate iPhone battery?
After installing every major iOS upgrade
When identifies a noticeable battery drainage
AiXun BC01 Battery Calibrator
If you are looking for the easiest and safest way to calibrate iPhone battery abnormalities, AiXun BC01 battery calibrator absolutely your first choice. It is a mobile phone repair tool specially designed for 11-14 series iPhone battery calibration.
One key startup, battery health rises to 100% automatically
Support battery charge and discharge round cycle test for 11-14 series
Type-C interface input, HD 0.9 inch OLED display
Support QC/PD fast charge protocols, online software upgrade
Operate only with one battery for each time, proper layout
Adjust discharging current automatically according to the cell performance
Clearly visible data, switch charging and discharging status optionally
Adjust wind speed automatically based on the power and temperature change, built-in overheating protection function
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