Features:Made of good quality material, safe to use.18650 rechargeable li-ion lithium battery.Suitable for laser pointer, flashlight torch and other electronics products.Safe and environmental friendly.Long using time up to 500 times.Descriptions:High energy density, and have an extra long life for all your battery powered devices.Provides excellent continuous power source solutions to your devices.Specifications:Rechargeable Times: Up to 500 times.Size: 66mm x 18mm (Diameter).Model: 18650.Capacity: 4000mAh.Voltage: 3.7VPacket content:1 x 18650 4000mAh Rechargeable Li-ion BatteryNote:According to different conditions, Battery capacity can be divided into actual capacity, theoretical capacity, also called rated capacity.Battery capacity refers to the battery storage capacity.The unit is "mAh", 1Ah = 1000mAh, so there are some differences between rated capacity and actual capacity in Li-ion Battery.It is normal and reasonable.   
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