The highest realistically available on an 18650 today is about 4000 mAh, anything higher than that is marketing hype. “3000 mAh” measures the amp hours the battery can provide.“3.7v” – is the optimal or peak voltage.“protected mode” means it has an overcharge and overdraw circuit protection built in (more info below).The 21700 at 1550 cubic mm, is larger than the 18650 battery – the 2170 is not interchangeable.Ĭomparing 18650s to Other Common Batteries Battery MakeĪ battery might say protected mode 3.7v 18650 3000 mAh low self discharge for high drain devices. Note the 14500's cannot be used in all AA devices unless they support both 3.7 and 1.5 volt batteries. The 18650 is 1170 cubic mm, the 14500 and AA are 700 cubic mm, the AAA is 467 cubic mm. The following is a picture showing various battery sizes. More info on the 21700: Everything You Need to Know About the 21700 Battery Various Battery Sizes Panasonic NCR 18650 3400mAh NOT PROTECTED Less expensive PROTECTED and good for high drain devices. Has micro-USB charger port so it can charge itself with a cable/usb port Recommended 18650 Batteries Battery Make and Type Charge time can vary with amperage and voltage of the charger and the battery type. The average 18650 battery charge time is about 4 hours. Many knock off, no-name brands lie about high mAh (capacity). We also recommend you stick with high quality “brand name” 18650s.

The popular LG HG2 and INR and Samsung 25r and 35e are UNPROTECTED batteries, only use them in a device designed to use unprotected 18650s. Unprotected cells can be overcharged and burst and potentially cause a fire unless there are specific electronics to protect the battery. Protected cells include a protection circuit that stops the cell from being overcharged. We absolutely recommend protected cell 18650 batteries. There are two types protected and unprotected. The 18650 cell has voltage of 3.7v and has between 1800mAh and 3500mAh (mili-amp-hours).ġ8650s may have a voltage range between 2.5 volts and 4.2 volts, or a charging voltage of 4.2 volts, but the nominal voltage of a standard 18650 is 3.7 volts. An 18650 is a lithium ion rechargeable battery.

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