Rechargeable battery: 16340 rechargeable battery, 3.7v lithium battery, cycle charging times of more than 500 times Standard battery: 16340 battery where “16” means the diameter is 16mm, “34” means the length is 34mm, “0” means it is a cylindrical battery Intelligent efficiency: Improved low self-discharge feature maintains 60% capacity after 3 years of non-use Convenience: Battery is partially pre-charged and ready to use out of the box. It is recommended that the battery is fully charged before use Widely used: 3.7v battery is suitable for digital cameras, toys, remote controls and other household devices 16340 Rechargeable Battery 3.7v Lithium Ion Battery 2800mah High Capacity Long-Lasting for Flashlight, Radio and Remote (4, 2800 mah)