Choose the best 18650 batteries. specs and performance
18650 batteries are common for vape pens, torches, doorbell cameras, power tools and also often packaged in battery packs such as solar cells, marine batteries, portable energy storage, etc.Here is a definitive guide to help you to choose the best 18650 batteries.
What is a 18650 battery
The 18650 battery is a Li-ion battery that is rechargeable/replaceable and is widely used in portable devices like electronic gadgets. Due to its high-drain feature, this battery has a high output voltage and current. This battery has a dimension of 18 mm by 65 mm, hence its name.
Common specifications for 18650 battery
Below is a table showing the specifications of the best 18650 batteries.
18650 Battery Specification Table
Battery type
Size/ dimension
Operating voltage
Discharge Cut-off voltage
Charge discharge cycle
Optimum /Minimum charging time
Shelf life
Charging method
Charging voltage
Charging current
Internal resistance
Product variant
Self-discharge
There are various 18650 batteries in the market. However, not all of them are powerful. Therefore, in this section are the three most powerful 18650 batteries.
How to Know a Fake 18650 Battery
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An average genuine 18650 batteries will weigh about 45g and no nothing less than 42g. You can see I have a fake 18650 battery in the pic weigh 32g only and the genuine 18650 battery weight 45g. Some genuine 18650 battery can weigh more than 50g. Good brands will tell you the weight of the battery.
You can use a digital kitchen scale.
Why fake 18650 battery weigh less? That is because inside is a smaller battery with step up circuit which wrap in layers of paper and stuffed inside a 18650 battery size case then heat shrink in a tight plastic label sheet to make it look real.
Genuine sellers will specify battery weight in their product description/sheet.
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Комментарии и мнения владельцев
There is a lot of great info here both in the video and in Комментарии и мнения владельцев too. I am learning from everyone I can about using these 18650 batteries but I dont see much info about their C ratings only mAh’s/fake or not. I use them for very high discharge applications (custom r/c vehicles) and now using an awesome little spotwelder to help create them. No more trying to solder/fail batteries. If i can figure out how to create (instructables) i will. https://youtu.be/TJq31wVMOuw
Fake is the wrong word. A fake battery would be one that is not a battery at all. In fact, there are empty cells made that are not fake, they are simply sold as empty to fill a mechanical void for battery packs with odd numbers of cells, and are used to fill a space mechanically for the structure of tha pack, without unbalancing the individual strings of cells. This is common in higher density packs that have staggered string sizes, or a pack with a specific shape, but wanting to maintain the fullness of the pack within that shape.
There are a lot of different capacity cells sold, and each weigh a different amount. There are a lot of reasons for using smaller cell sizes, ranging from reducing the cost of the cell for marketing or cost reasons, to safety regulations for a particular regulated application. There are safety standards for appliances used in critical or hazardous environments that might limit how much lithium is present, or have containment requirements that reduce how much you can put in a cell and still meet the safety spec. A cell that is integrated as a backup of short duration might be made for one application, and find it’s way to the surplus market where it is sold on ebay. Nothing fake going on there, as long as no lies are being told.
If the battery has a rating that matches it’s actual capacity, any capacity or weight is valid. That is a big IF as exaggerations and rip-offs are common. Anyone can cut the shrink wrap off a cell, and replace it with a new wrap, with whatever markings they want. These repackaged cells can simply be remarketed cells, or actual forgeries of popular brands. Some flashlight makers rebrand all batteries they sell. Some are honest and some are not.
And besides capacity specifications, there are safety features, and the absence or presence of cell protection circuitry that has an impact as well.
When evaluating a cell from a new vendor, you should perform a capacity test where you drain a cell to the rated cutoff voltage, then test the charge cycle to see how much charge it takes, then perform a discharge at both slow and fast rates to see the results from thos tests. Discharge rates matter! The slower you discharge a storage cell, the more power in total you get from it. And that affects the cell rating for a given application. So the same cell can have a different capacity depending on what it is used for.
And a sand filled cell sounds fishy, and probably is. Unless there are weight requirements that need to be met coupled with a lower capacity requirement. The buyer of a manufacturer’s production run is responsible for the specifications of that run, and their reasons and final product markings could be honest or dishonest. While I would agree in principle that dishonestly market batteries are somewhat fake in nature, the word fake is not an accurate word in most cases. A buyer will always do capacity spot checks as part of the qa of the incoming parts, as most parts have a certain percentage of bad units, and for a product build there will need to be some way to accommodate for the occasional bad part, especially from a new manufacturer or from a surplus supplier. Even new chips might be remanufactured pulls from scrap electronics, so the incoming QA team is there to keep suppliers honest.
So you are right that there is more to a battery than the claims printed on the shrink wrap cover. But the QA process is so much more than just weighing the cell.
Product specifications
Cells with specification different from the above products can be provided upon customer’s request.
Cells with specification different from the above products can be provided upon customer’s request.
Product features
It’s the perfect pack solution for a Power Tool
Reduce recharging time Samsung SDI provides the world’s fastest charging pack technology that allows for full recharging within 30 minutes.
Enhance quality and safety Samsung SDI conducts field risk review to provide safe and high-quality packs for power tool. Field Risk Review: Samsung SDI’s safety validation test for evaluating the risk of the product under an environment similar to an actual usage environment.
Get fully supported by exclusive power tool pack development team Samsung SDI has a team committed to developing packs for power tools, and responds to customer demands in a professional and timely manner.
Product specifications
The specifications above are for Samsung SDI’s representative packs.Samsung SDI can also provide packs with a custom specification desired by the customer.
The specifications above are for Samsung SDI’s representative packs.Samsung SDI can also provide packs with a custom specification desired by the customer.
Manufacturing process
Watch how the Samsung SDI’s Li-ion Battery cell is developed into a battery pack
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Product Model: INR 18650 30Q
Rechargeable Lithium Ion cells have a negative electrode (anode) made from lithium compounds. Lithium is a highly reactive material and is much lighter than the hydrogen-absorbing metal alloy of the NiMH negative electrode. This leads to higher gravimetric energy densities for the Li-Ion cell.
Have low internal resistance and high flat voltage characteristics during strong current discharge, which ensures a wider application field.
Provide long storage life with few limiting conditions. It offers problem-free charge after long storage, permitting to use in a wide range of applications.
Generally, what are Lithium-Ion Batteries? A. Lithium-ion batteries are rechargeable batteries in which lithium ions move from the anode to the cathode during discharging and back when charging. They are popular batteries for use in consumer electronics because they provide high energy density, possess no memory effect and have a slow loss of charge when not in use. These batteries come in a wide variety of shapes and sizes. Compared to lead-acid batteries, Lithium-ion batteries are lighter and provide a higher open circuit voltage, which allows for power transfer at lower currents. These batteries have the following characteristics:
Features of ionic Lithium-ion Deep Cycle Batteries:
Light weight, up to 80% less than a conventional, comparable energy storage lead-acid battery. Lasts 300-400% longer than lead-acid. Lower shelf discharge rate (2% vs. 5-8% /month). Drop-in replacement for your OEM battery. Expected 8-10 years of battery life. No explosive gasses during charging, no acid spills. Environmentally friendly, no lead or heavy metals. Safe to operate! The term “Lithium-ion” battery is a general term. There are many different chemistries for Lithium-Ion batteries including LiCoO2 (cylindrical cell), LiPo, and LiFePO4 (cylindrical/prismatic cell). Ionic mostly focuses on designing, manufacturing and marketing LiFePO4 batteries for its starter and deep cycle batteries.
What are LiFePO4 (Lithium Iron Phosphate) Batteries? A. Lithium Iron Phosphate (LiFePO4) batteries provide several advantages over traditional Lithium-ion batteries based on LiCoO2 chemistry. LiFePO4 batteries provide much higher specific capacity, superior thermal and chemical stability, enhance safety, improve cost performance, enhanced charge and discharge rates, enhanced cycle life and come in a compact, lightweight package. LiFePO4 batteries an offer a cycle life of over 2,000 charge cycles!
Why should I get a ionic’s lithium-ion “Deep Cycle” energy storage battery? A. Lithium-ion batteries provide multiple advantages over standard lead-acid batteries for energy storage use that we’ll outline below:
Substantially Lighter – Lithium-ion batteries are just a fraction of the weight of the original lead-acid battery. Powerful – Lithium-ion batteries operate at a higher voltage than standard lead-acid batteries, giving you faster engine speed for longer durations. Lead-acid batteries drop to just 12.5V when only 20% of the battery capacity is used, but lithium-ion batteries provide over 12.8V even when only 20% of the battery capacity is left. Low Self-Discharge Rate– Lead-acid batteries lose 4%-25% of their charge every month depending on the quality of the plates and separators used. If you leave a vehicle unattended for a month, the lead-acid battery might lose too much power and the vehicle might not start. On the other hand, our lithium battery chemistry loses less than 3% of charge per month; you can go for several months without having to worry. Environmental Friendly– Ionic batteries contain no toxic substances. There is no poisonous lead or corrosive sulfuric acid and as a result, no possible way for an explosive gassing event that is common with lead-acid batteries. In addition, there is no need to maintain acid levels or worry about venting like traditional lead-acid batteries do. The only maintenance that ionic batteries require is ensuring that the battery never drains beyond 80% to ensure optimal life. Long Lasting– Cheap lead-acid batteries usually only last 1 to 2 years while gel and AGM lead-acid batteries last 3-5 years with proper maintenance. However, ionic’s lithium-ion batteries can provide 8-10 years of use, easily exceeding the life of any lead-acid battery. Battery life depends purely on proper operation and maintenance, so use common-sense and ensure the battery does not drain beyond 80% discharge. If you are replacing a lead-acid battery in two years or less due to deep cycling damage, you will save money in the long run moving to a ionic lithium-ion Fast Recharging – ionic’s lithium-ion batteries can accept charge current at up to 5 times faster than a lead-acid battery. What’s more, the charge efficiency is about 75% for lead-acid in contrast to 97% for ionic’s lithium-ion battery. That means less energy is needed to charge and causes less strain on your alternator.