Best High Capacity Power Banks (25,000mAh ). Nupower power bank

Best High Capacity Power Banks (25,000mAh)

If there’s one thing that many people want to know before they purchase a power bank, it would have to be the power capacity of the portable charger. It’s basically what makes a portable charger, portable in the first place and it’s also what dictates how you’re going to experience your portable charger. As there are power banks that have low power capacities such as 3,000mAh, and those are basically among of the most purchased power banks but at the same time, they don’t last very long but they’re very easy to take anywhere.

Then there’s a step up from that with there being power banks have 10,000mAh power capacities, and these are basically mid-range power banks that have a good amount of power capacity to charge smartphones about two times. At the same time, these mid-range power banks have a small form factor that can still be quite easy to be portable with.

In this guide, we’re going to be going over the best 25,000mAh high capacity power banks. These types of power banks have a lot of power to be used and therefore, they can last for quite a while as they charge many types of devices to their full power multiple times. At the same time, they also use quite a few charging ports so that you can charge many devices at once. So let’s take a closer look if power banks with a humongous power capacity are what you’re really looking for.

The first high capacity power bank that we have to recommend comes from the brand, Anker. They’re one of the highest rated brands that sell charging electronics on the market, with many reviews to prove it. This PowerCore 26800 portable charger is one of Anker’s highest capacity portable charger and it has a 26,800mAh power capacity as you could have probably guessed by the name of the charger. So you’re able to charge smartphones to their full power many times over without any problems, and the same is for a tablet as well. Then there’s the charging side, and there are three USB charging ports to use.

Each of the three ports on this power bank has a 5V/3.0A charging speed and the max output of the power bank is 6A. A 3 Amp charging speed is higher than the norm that most other power banks tend to have which would be 5V/2.4A. Also, with the max output of the power bank being 6A, you’re able to get a 5V/2.0A charging speed even if you’re using all the ports and the max output of power (6A) is being reached.

Recharging the PowerCore 26800 is a great experience and that might sound strange for such as high capacity power bank but it’s true, as this power bank uses two Micro-USB input ports to recharge. So you can use them both at the same time and that will result in an in a 4A recharging speed for a much faster recharge time than if you were to use just a single input port.

Specs of the Anker PowerCore 26800 Portable Charger:

Per Port – 5V/3.0A

Max Output – 6A

5V/2.0A Per Micro USB Input

4A Total if both Micro-USB Inputs are used

  • LED Power Indicators: Four-LED status system
  • Size: 7.1 x 3.2 x 0.9 inches
  • Weight: 1.1 Pounds

Most of the time high capacity power banks use two or three output charging ports, it’s actually quite rare for even high capacity power banks to be using four charging ports. This Aukey power bank goes quite far and it not only has four output ports, but it also has three input ports. The power capacity of the portable charger is abundant at a 26,500mAh power capacity so there’s really no shortage of power to charge your smartphone or tablets to their full power multiple times. You can even charge a USB-C compatible laptop to its full power with this power bank because this charger uses a USB-C port, that said, it’s really only compatible with a USB-C MacBook and even then, the USB-C port on this power bank won’t charge it at its max charging speed. So there are four output ports. Three of the output ports are USB-A ports, with two using a 5V/3.0A charging speed, and one other USB-A port has a 5V/2.4A charging speed. The one other output port is the USB-C port that we mentioned that has a 5V/3.0A charging speed and you can use a USB-C to USB-C charging cable to charge USB-C compatible devices. Of course, like we said before, the USB-C port does not feature Power Delivery, so it’s good to charge any USB-C compatible smartphones, but very few USB-C laptops. Then there’s the recharging part of this power bank and there are three ways to recharge it, and you can only use them one at a time. There’s a Micro-USB input with a 5V/2.0A recharge rate, a Lightning input with a 5V/1.5A recharging speed, and then there’s the USB-C port that can also be used as an input with a 5V/3.0A recharging speed. It’s great to have all these recharging options because it truly makes this power bank a universal one that can be used for iPhone and Andriod users alike.

Specs of the Aukey 26,500mAh Power Bank with 4 Outputs and 3 Inputs:

Initial Capacity: 26,500mAh

Output Capacity: 19,500mAh

USB-A Port 1/2: 5V/3.0A

USB-A Port 3: 5V/2.4A

USB-C Port: 5V/3.0A

Micro-USB Input: 5V/2.0A

Lightning Input: 5V/1.5A

USB-C Input: 5V/3.0A

This RAVpower portable charger goes even further with its power capacity than the previous power banks that we mentioned, as it has a 32,000mAh power capacity. It’s actually one of the highest capacity power banks on the market that still maintains portable charger form factor rather than being a portable power station and that means a lot for portability purposes. So with the 32,000mAh power capacity, you can rest assured that you can keep using this charger for a week straight and not have to worry about running out of power.

There are a total of three charging ports on this power bank, with each of the USB ports outputting a 5V/2.4A charging speed, and the max output of the power bank is 6A. A 2.4A charging speed is a fast standard charging speed, and if you’re charging three devices at once, then each port is still capable of charging at a 5V/2.0A charging rate. Still quite fast and close to the max power of the individual port.

Recharging this RAVpower 32,000mAh power bank could have been an improved a bit and that’s because this power bank uses just a single Micro-USB input with a 5V/2.4A recharging rate. It would have been better to have the input use Quick Charge. That said, just make sure that you use a 2.4 Amp USB wall charger or higher to recharge this power bank as fast as possible.

Specs of the RAVPower Ace Series 32,000mAh Portable Charger:

Speed Per a Port: 5V/2.0A

Max Output: 6A

  • Input: 5V/2.4A Via Micro-USB Input
  • LED Power Indicators: 4 LED Power Capacity Indicators
  • Size: 7.7 x 4 x 1.3 inches
  • Weight: 1.3 Pounds

This is another high capacity power bank that uses four charging ports, and it comes from the brand, EasyAcc. They’re quite a small brand on the market but the power banks that they have released are ones that truly innovative, such as their MegaCharge 16,750mAh power bank and also their new 20,000mAh MegaCharge power bank. This 26,000mAh power banks, of course, has its own special attributes with its immense power capacity and many charging ports. Each of the four charging ports on this power bank has a 5V/2.4A charging speed, and the max output of the power bank is 4.8A. So you can use only use the max power of two ports at the same time, and if you’re charging four devices at once that will slow charging speed down for each of the ports depending on what devices you’re charging. At the same time, it’s still quite impressive to be able to charge four devices at once, such as having two smartphones and two tablets charging at the same time among your friends or family. Then there’s the recharging that is equally as impressive and that’s because this power bank use two Micro-USB input ports that can be used at the same time and using them at the same time will result in a 4A recharging speed.

Specs of the EasyAcc Monster 26,000mAh Power Bank:

2 Micro-USB Input Ports / Per Port: 5V/2.0A / Max Input:4.0A

best, high, capacity, power, banks
  • LED Power Indicators: 4 LED Power Indicators
  • Size: 6.6 x 3.1 x 0.9 inches
  • Weight: 1.2 Pounds

This Zendure power bank is rather new to the market, but it is a great addition to the portable charging space. That’s because the charger has a high power capacity, of course, but there are four charging ports, with one of the ports featuring Quick Charge. The power capacity is 26,800mAh so you’re able to get plenty of full charges for nearly any USB chargeable device that you charge with this power bank.

Three of the USB-A ports on this power banks have a 5V/2.4A charging speed, while one of the USB-A ports uses Quick Charge so you can fast charge Quick Charge compatible smartphones with it. The max output of this power bank is 6.1A (33.5W), so you can use the max power of the Quick Charge port, while at the same time charge another three devices at once, The max output of the Standard ports is 3.1A. So it’s the perfect high capacity power bank if you want to have the ability to charge four devices at once, and at the same time have Quick Charge available for usage.

To recharge this power bank you can use the single Micro-USB input and thankfully the input port uses Quick Charge, so you can use a Quick Charge wall charger to recharge the power bank at Quick Charge speeds.

Specs of the Zendure 26,800mAh 4-Port Quick Charge 3.0 Power Bank:

Each Standard USB Port: 3.1A Shared Output (15.5W)

Quick Charge Port: 6V/3.0A | 6-9V/2.0A | 9-12V/1.5A (18W)

Max Output: 33.5W

Micro-USB Input: 5V/2.0A | 9V/2.0A | 12V/1.5A (Quick Charge 18W)

  • LED Power Indicator: Digital Power Capacity Display with 3-Digits
  • Size: 4.7 x 2.9 x 1.6 inches
  • Weight: 1 Pound

One of the best benefits of having a high capacity portable charger, especially if you’re someone that owns a USB-C Power Delivery laptop or smartphone is that you can make use of Power Delivery portable chargers. Most Power Delivery portable chargers, if not all, come with high power capacities. This is another Anker power banks and very similar to the first Anker power bank that we mentioned but this one features 30W of Power Delivery charging with its USB-C port, so you can charge a USB-C compatible MacBook at a faster charging speed, and you can charge USB-C Power Delivery compatible smartphones at their max charging rate, too. Each of the USB-A ports on this power bank has a 5V/3.0A charging speed. Recharging this power bank is a great experience because the PowerCore 26800 can be recharged at Power Delivery speeds with its USB-C port. The best part is that this power bank comes with a 1-port 30W USB-C Power Delivery wall charger that you can use to recharge the power bank at its max charging speed. You can also use the wall charger directly to charge your device, too.

Specs of the Anker PowerCore 26800 Power Bank with 30W Power Delivery Charger:

Initial Capacity: 26,800mAh

Output Capacity: 20,000mAh

Both USB-A Charging Ports: 5V/3.0A

USB-C Port: 30W

  • Input: 30W through USB-C input with USB-C Wall Charger
  • LED Power Indicator: Yes
  • Size: 6.5 x 3.1 x 0.9 inches
  • Weight: 1.3 Pounds

One other high capacity Power Delivery portable charger that we have to recommend comes from, Jackery. It’s quite similar to the above Anker power bank, as this charger also has a 26,800mAh power capacity that can be helpful with charging smartphones and laptops to full power multiple times. There are only two charging ports on this power bank but that’s not really a bad thing, as one port is a Quick Charge USB-A port, and the USB-C Power Delivery port has a 45W charging speed. That’s 15W higher than most Power Delivery portable chargers are able to offer, so you can charge more powerful USB-C laptops at or near their max charging rate. This Jackery SuperCharge power bank also comes with a 45W USB-C Power Delivery wall charger that you can use to recharge the power bank at its max charging speed. Something that is not very common when it comes to power banks, in general, is the usage of a digital power capacity display, but this Jackery power bank actually does use one with 3 digits being used.

Specs of the Jackery Titan X 20,800mAh 45W Power Delivery Portable Charger:

Initial Capacity: 20,800mAh

best, high, capacity, power, banks

Output Capacity: 15,400mAh

Quick Charge USB-A Port: 5V–6.5V/3A | 6.5V–9V 2A | 9V–12V/1.5A

best, high, capacity, power, banks

USB-C PD Output: 45W

The final best high capacity power banks that we’re recommending is one with an AC outlet that you can use to power appliances and it’s RAVPower’s 27,000mAh power bank. The charger makes use of three charging ports, with two being USB-A ports that each have a 5V/2.4A charging speed, while one other port is a USB-C port that has a 5V/3.0A charging speed. The USB-C port does not feature Power Deliver but it’s still very useful for charging quite a few USB-C compatible devices. Then there’s the AC outlet that’s able to supply 100W of power, so you can power small appliances and it’s also great for providing power to laptop chargers.

Specs of the RAVPower 27,000mAh AC Outlet Power Bank:

USB Port charging: USB Type-C / Two iSmart USB Charging Output Ports

USB Type-C: 5V/3.0A

iSmart Charging Ports: 5V/2.4A

  • Input: 19V/1.6A via DC Input Port
  • LED Power Indicators: 8 LED Power Capacity Indicators
  • Size: 5.5 x 6.7 x 1.6 inches
  • Weight: 1.87 Pounds

To get the most out of a power bank it must be used in the right way. there are some key tips on how to get the best from your power bank.

Power banks are used by a lot of people and they can be essential for providing extra power whilst on the move for mobile phones and other gadgets.

Power banks are easy to use and their operation is easy to master, but there are some pitfalls that can mean they might not be as effective as they might be and provide all the power you want.

By following a few guidelines when using and keeping the power bank, the top performance can be obtained and its life can be extended so it won’t let you down.

Basic power bank usage

Power banks are generally very easy to use, and typically conform to some simple conventions, especially with respect to the connectors.

Normally power bank connectors have separate functions and the two connectors used for these functions are very different, making it easy to differentiate them.

  • Micro USB (sometimes mini-USB): Most commonly a power bank will use a micro-USB for being charged. This enables the standard USB A to micro-USB leads to be used to charge the power bank. Often the same lead used to charge a mobile phone or other device can be used.
  • USB Type A connector: The larger type A USB connector is used to enable the power bank to charge other devices. This means that standard charging cables supplied with most phones and other devices can be used. Normal USB chargers have a Type A connector from which the charge is supplied.

When using the power bank, it is normally only necessary to connect a powered USB micro connector to it for it to receive charge.

Depending on the power bank capacity, its charge level, and the charger, the ambient temperature, etc., it can take quite a while to complete its charge.

As an example, a 1500mAh rated power bank should take very roughly about the same time as a typical smartphone to charge. For larger power banks, this time can be considerably increased. it may take two three, four. times as long.

Power banks have electronic battery management and this includes a safety cut-off to prevent overcharging and overheating. However, whenever possible, it is best to remove the power bank from charger when it is full. at least avoid leaving it connected long-term after its full.

However when using the power bank to charge electronic devices, the leads need to be connected, and it is normally necessary to use a button on the power bank to enable the charging. This is required because a sort circuit on the output of the power bank could generate a lot of heat and possibly cause the power bank to catch fire or explode.

This prevents keys in s (if the power bank is carried in a ) and other metallic items causing an accidental short circuit, and the output normally has to be enabled before use.

Often the power bank will have a simple LED indicator showing the level of charge it has when charging is enabled, or when it is being charged. These indicators often turn off after a short while to preserve the power bank charge.

Power bank charge capacity

One of the most common uses for power banks is to charge mobile phones whilst on the move when there are unlikely to be any suitable charge points.

With modern mobile phone internal batteries now being able to store large amounts of charge (some are over 2500mAh), it is necessary that the power bank has in excess of this if it is to give the mobile phone battery a full charge.

It is also necessary to remember that the charging process is not 100% efficient. some of the supplied power is dissipated as heat, etc.

As a result the power bank should have a slightly larger capacity than the phone battery if it is to give it a full charge.

If the power bank has a smaller charge capacity than the phone, it will only be able to give it a partial charge. this may be acceptable in some instances if the power bank is only needed to top-up the main phone battery.

Power bank care: usage hints, tips guidelines

In order to get the best from any power bank there are a few guidelines that will help ensure the performance is gained from the power bank for as long as possible.

  • Keep at room temperature: The best performance can be obtained from a power bank if it is kept at around room temperature. While this may not be possible all the time, it is wise to use this as a general guideline. The battery technology used in power banks is lithium ion, and these batteries do not like getting excessively cold, or too warm either. One of the key things to remember is that they should not be left in automobiles. In the summer sun the inside of cars can rise to in excess of 50°C, and in winter the cars have no heating when they are not in use, so the temperatures can fall really low in some places. Either scenario is not good for lithium rechargeables.
  • Charge before first use: Manufacturers always recommend giving a new power bank a full charge before use. The internal circuits will cut out the excess charge, but it is always wise to get it into a known state before starting to use it.
  • Keep the battery charged: This may sound obvious, but the power bank is no use if it is not charged up. It helps to get used to charging it up as soon as possible after it has been used. In this way it will always be ready for use.
  • Charge the power bank when not used for period: Lithium ion and lithium polymer rechargeable batteries do not like being left in a fully discharged state for long periods. As batteries will always lose a little charge with time, it is best to periodically recharge the power banks when they have not been used for some while. This means they are ready for use and the battery is kept in tip op condition. The ideal state for a lithium ion battery is neither fully charged or discharged, so if possible keep it in an approximate mid-charge state if it is to be left for a long period.
  • Only use power bank in the intended way: This may sound obvious, but a power bank should only ever be used for charging the type of device for which it is intended. Some devices may have different voltages, although if they have a USB connection this would not be the case. Also large devices may draw too much current from a small power bank and the like.
  • Keep away from moisture: Power banks are electronic devices, and therefore they do not like water, or even moisture. One key piece of advice when using power banks is to keep them dry at all times. With the amount of power within the power bank, moisture can cause significant damage.
  • Don’t keep in or bag with metal objects: In view of the amount of power held within power banks, and the possibility of short circuit, one very important aspect of using power banks is to make sure they are never shorted. Although power banks normally have a button which needs to be pressed to enable the supply on the output, it is always best to be careful and make sure they are never placed in a position where metal objects could short the output. Putting them in a alongside keys is a definite “No No.”
  • Don’t drop it: Power banks incorporate circuit boards as well as the battery. Like any other item of electronic equipment they need to be handled with some care. Dropping them can damage the case, the circuit board, or even the lithium rechargeable battery element itself. Take care when handling them.

Power bank rechargeable batteries are very easy to use. With a few sensible precautions they are really accommodating and provide additional charge when you are on the go and don’t have access to mains power.

One of the main points to remember, is to keep them charged. This is sometimes easier said than done, but there is no use having it if it is not recharged as soon as possible after it has been used.

How to Use a Power Bank: Here’s Everything You Need to Know

You know that anxious feeling when the “low battery” notification pops up on your screen? There’s something about it that can send your mind into a tailspin. Even worse, sometimes you don’t have your charger, and you’re nowhere near an outlet! Luckily, there’s a handy tool out there to keep you fully charged: the power bank. If you’re looking to learn the basics of power banks, you’ve come to the right place. Let’s get right into it!

How to Charge a Power Bank Top

Charging a power bank is pretty straightforward, especially since most of them come with instruction manuals. However, if yours didn’t come with one, you can still charge it without breaking a sweat!

Here is the best way to charge a power bank:

  • Attach the cable to the power bank.
  • Connect the other side of the cable to your power source.
  • Your power bank should begin charging.
  • Once charged, unplug the power bank from the wall and your phone.
  • Step 1: Attach the Cable Attach the cable that came with your power bank to the device itself. Most of the time, the port that connects to your power bank is a micro USB.
  • Step 2: Plug Into Power Source Next, plug in the other side of the cable (usually a standard USB) into your wall plug or your computer. Some wall outlets even have USB ports built in, so if you have one of those nearby, you won’t need a wall adapter!
  • Step 3: Start Charging Your power bank should start charging. If it has an indicator light, keep a close eye on it. Once it is fully charged, all the indicator lights will illuminate.
  • Step 4: Unplug the Charger Unplug the charger from the wall or your computer once all indicator lights are illuminated.

How Often Should You Charge a Power Bank? Top

A general rule of thumb is that the more you charge your power bank, the shorter the lifespan of the device. You should charge your power bank only as often as is necessary. If you use your power bank sparingly, at least charge it once every 3 months to keep the battery active.

Can I Use My Phone While Charging? Top

There shouldn’t be any harm in using your cell phone while it is charging. You may notice your phone getting a bit warm, but this is expected. It’s worth noting, however, that using your phone while it is charging may not result in a 100% charged battery since you are actively using the power source before the charge is complete. If you want your cell phone to be fully charged, it’s best to leave it alone while it powers up!

Why Do Some Power Banks Take Longer to Charge? Top

Some power banks take longer to charge because larger batteries have a bigger capacity to store energy. For example, a high capacity power bank with 20,000 mAh can take up to 40 hours to charge fully. Smaller power banks with 4,000 mAh may only take a couple hours to charge.

Think of it like a shot glass versus a tall drinking glass. It’s going to take a lot longer for a drinking glass to fill with water than it will for the shot glass!

How Long Should You Charge a Power Bank? Top

You should only charge your power bank for the amount of time it takes for it to get a full battery. Once the device is fully charged, you should unplug it from the power source. You can check the user manual to find out how your power bank indicates it has been fully charged, but most of them have some sort of light that shows the amount of power left in the battery.

The amount of time it takes for a power bank to reach its full capacity varies depending on the type. A heavy-duty power bank will take longer to charge than a smaller one. Generally speaking, it takes between 1 to 2 hours for a power bank to become fully charged!

Did You Know?

There are super powerful power banks on the market that allow you to power larger devices like televisions, curling irons, and oscillating fans!

Can I Charge My Power Bank Overnight? Top

You should avoid charging your power bank overnight whenever possible. It is unlikely to cause significant damage, but there is still a chance it could reduce the lifespan of your battery over time.

For lower-quality power banks, leaving your power bank plugged in after it is fully charged can cause overheating, especially if they are left to charge in direct sunlight. The safest option is to always unplug your power bank once it has reached full capacity!

How Can You Make Your Phone Charge Faster? Top

If you ever find yourself in need of a quick battery charge for your smartphone, there are a few steps you can take to make your phone charge faster. Always make sure your charging cables are plugged all the way in and your power bank has enough power to charge your phone.

Here are some tips to make your phone charge faster:

  • Turn on airplane mode
  • Don’t use your phone while charging
  • Turn your phone off
  • Use a high-capacity power bank
  • Don’t use a wireless charger

Turn on Airplane Mode

Putting your phone on airplane mode is a surefire way to reduce charging time. This is because the setting turns off your phone’s Wi-Fi, Bluetooth, and cellular capabilities, which are all settings that drain your power! When your device is on airplane mode, it’s consuming less power, which makes for a quicker charge.

Don’t Use Your Phone While Charging

Using your phone while it’s charging is going to increase the amount of time it takes for your battery to be fully powered. It may be difficult to resist the urge to send that text message or check Instagram, but it’s worth the sacrifice if you want your phone to be fully charged!

Turn Your Phone Off

This strategy works similar to airplane mode because it turns off all the components in your phone that would otherwise be using your battery. When your phone is powered off, it’s able to reach a full charge much faster. Keeping your phone on while it’s charging is like trying to sleep while you’re hungry or thirsty—it’s going to be much more difficult!

Use a High-Capacity Power Bank

Some power banks are more powerful than others. The heavy-duty ones are going to make your phone charge much faster than the smaller ones! However, not all phones can handle a high-powered portable charger. It’s best to contact the manufacturer of your cell phone to see what they recommend. Charging your battery with too much power is never a good idea!

Don’t Use a Wireless Charger

Wireless chargers are a genius invention, but they’re not the best option if your goal is to charge your phone quickly. Plugging your phone in directly to a power bank or outlet is the quickest way to bring it back to life because it’s directly connected to the power source!

At the end of the day, any way you can prevent your phone from using battery while charging will ultimately help it charge faster! You might also notice your phone charging slowly with a low-capacity power bank. Be sure that your phone and power bank are compatible for the most efficient charging.

How Long Do Power Banks Last? Top

The amount of time a power bank lasts varies from product to product, but on average, a power bank should last at least a couple hundred charging cycles.

If you use your power bank frequently, you’re going to consume more charging cycles than someone who only uses their power bank occasionally. There are more durable power banks out there than can last upwards of 1,000 charging cycles, but most of the smaller ones on the market have a lifespan of 200 or 300 cycles. The age of the power bank also has a significant impact on how long it lasts. As the batteries inside of the device age, they become less effective.

How to Store a Power Bank Top

Power banks should always be stored in a cool location that isn’t exposed to direct sunlight, such as a desk drawer. According to Battery University, batteries achieve optimum service life if used at 68 degrees Fahrenheit, or slightly below that temperature.

If you store your power bank in direct sunlight or a warm environment like the glove box in your car, it won’t last as long. It’s also best to store your power bank in a pouch or case when not in use. This helps protect the charging ports so they do not accumulate dust or debris!

Should You Buy a Power Bank? Top

If you’re always on the go or find yourself with a low battery, you should buy a power bank! They come in handy during vacations, trade shows, plane rides, or any time you are using your phone away from an outlet. The type of power bank you’ll need depends on your lifestyle and how many devices you need to charge.

There’s no reason to not invest in a power bank. They’re like an extra insurance policy for your phone’s battery! Having one with you just in case is always a good idea.

The Bottom Line

Power banks make our lives a bit easier by ensuring we never run out of juice. By using them properly, you’re not only protecting the power bank, but you’re also getting the most out of your investment! A properly cared-for power bank will get you through those long meetings and plane rides. Just think of all the adventures you’ll go on while still having peace of mind!

Discharging at High and Low Temperatures. (n.d.). Retrieved March 25, 2020, from

Summerson, C. (2017, December 4). Is Wireless Charging Slower Than Wired Charging? Retrieved March 27, 2020, from

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Lenmar and NuPower MacBook Pro Battery Pack Teardown

Today I took apart two different 3rd party battery packs for the 2006-2008 15″ MacBook Pro. The OEM batteries had the following model numbers A1175, MA348, MA348G/A, MA348J/A, MA348/A.

These packs probably date from early 2010.

NuPower and Lenmar batteries

The first is a Newer Technology NuPower 63Watt Hour Capacity Battery, part # NWTBAP15MBP58RS. There is a barcoded sticker on the outside with the number U091228A11753.

The second is a Lenmar, 10.8v, 60WH/5600 mAh. Model/Part LBMC348.

Superficially they look very similar, but their are some significant differences in their construction.

The NuPower has a relatively thick aluminum plate on the outer surface that is glued to the case. If I recall correctly, this glue failed prematurely and had to be redone. The bottom section of the battery pack is a single piece of plastic, though the back side is painted with a metallic paint to simulate the appearance of the original Apple battery. While this would seem to be a reasonable construction approach, one has to wonder why Apple chose to use a metal back in the first place. A metal back would be thinner than a plastic back, and also transfer heat more readily.

The Lenmar uses a thinner sheet of aluminum for its outer plate. This plate is then adhered to a thin steel sheet that has various bent tabs which catch and latch into the plastic frame of the bottom case. The plastic frame is then glued to a thin steel tray. This is closer to the construction of the original Apple battery pack

Internal view of NuPower and Lenmar battery packs

Once inside, we see a more significant difference in the construction of the two battery packs.

5,600 mAh Lithum polymer pouch cells in NuPower battery pack

Cells from Lenmar battery pack

The NuPower pack, on the left, has a single stack of three 3.7v 5,200 mAh cells. They are labeled as Yoku 3895130, 5,200 mAh/3.7v, BL9120407012749. They measure ~130x95mm and the stack of three is ~11.25mm thick.

The Lenmar pack, on the right, has 3 stacks of pouch cells, each stack is 2 cells deep, connected in parallel. They are labled as YLE 3.7v, ICS594395A280 468061801483. Each pair of cells is ~90x42mm and is also ~11.25mm thick.

I don’t have an original Apple battery around to use in a close comparison, but the Lenmar battery pack construction is much closer to my memory of the stock Apple battery, both in terms of cell configuration, and assembly. I’m still not sure what to make of the absence of a metal back on the NuPower battery. I thought perhaps the Apple and LenMar batteries used the metal back to accommodate a slightly thicker battery, but that doesn’t seem to be the case, since the thickness of the cells in both the Lenmar and NuPower packs is 11.25mm. I don’t know how thick the cells are in an original Apple battery, but I suspect that the metal is there for better heat transfer, and its omission seems like an undesirable bit of cost cutting.

Looking more closely at the cells, I see that Yoku is a battery manufacturer based in Fujian, China. I’m going to guess that the “3895130” gives the dimensions of the cell, 3.8x x95x130mm, which pretty much matches with the dimensions I measured. I don’t know what the remaining number is, but my guess is that it is a manufacturing lot code.

YLE is manufacturer based in Shenzen, China. and ICS594395A280 is a documented part number for a 5.9x43x95mm 2,800 mAh/3.7v cell.

Interesting that the nominal capacity of the Lenmar cells are higher than the cells used in the NuPower, but NuPower claims theirs is a 63 Watt-hour battery, while Lenmar only claims 60 Wh. At this distance though, what I know is that the Lenmar pack is well and truly dead. Two of the parallel packs had voltages ~1v, which is dangerously low. The remaining pair of cells was ~2.6v, which might still be safe to use, though I’d have to put it through testing to see how much of the rated capacity remains. The NuPower still works, and the cells were at something close to 3.7v each. The estimated capacity of the pack, as reported by System Information, is quite low though, perhaps 50% of original, which is why I decided to tear it open in the first place.

I’m not sure what I’m going to do next, other than recycling the low cells. I’ll probably set the good cells aside until I get a hobby charger that I can use to analyze them and decide whether they are worth keeping to power misc projects.

I’m also going to look into buying replacement cells and rebuilding the packs, provided that the price is right and the seller is reputable. I could just order a replacement for the whole pack, but I’d be a bit concerned about getting old stock at this late date.

thoughts on “ Lenmar and NuPower MacBook Pro Battery Pack Teardown ”

Thanks for your interesting description of the MacBookPro A1175 battery, I recently had a similar study with the original pack with the S3P2 cell layout. The battery connector has 6-pins, do you know how it works, have a circuit layout? there is some internal switch so one can not measure open-ciricuit voltage from outside. thanks in advance

Robert, I’ve published some more info on laptop packs, including the pinout of the connectors on these batteries. The MacBook Pro batteries I have present their voltage all the time. It may be that the replacement packs left out the battery enable function, or, it may be that the voltage in your cells are low enough that the battery protection circuitry has triggered to prevent further discharge. To test if it has the battery enable function, monitor the voltage between the outer pins on the connector, then use a 1KOhm resistor to connect between the negative pin and the space that is marked as unused on my packs. If the battery enable function is present, you should see voltage across the pins, though I think it may only be momentary if the cell voltage is also too low. I’m not an expert in this, so please look for corroboration from other sources, but my understanding is that If the voltage is too low, you might be able to revive the cell by applying ~9.1V at a low constant current (~200mA for these packs, I think). Recheck to see if the pack presents voltage after five minutes. If not, repeat, but don’t do it for more than 30 minutes total. Again, check around for more information on boosting or waking a sleeping lithium ion battery, rather than treating me as an authority.

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