18650 Li-ion Rechargeable Battery (1500 mAh) battery is a Li-ion rechargeable battery with a 1500 mAh Battery Capacity. This is not a standard AA or AAA battery but is very useful for applications that require continuous high current or high current in short bursts like in cameras, DVD players, iPods, etc. A 18650 cell can be charged and discharged up to 1000 cycles without much loss in battery capacity. They are safe to use, environmentally friendly, and have long battery life. It comes with high energy density and provides excellent continuous power sources to your device. It should be used with a protection circuit board that guards the battery against over-charge, and over-discharge of the pack, and avoid over-current drawn.