Functions  Battery model: Rechargeable CR123A lithium-ion battery (no AA or AAA batteries)  Battery capacity: 1300 mAh  Battery dimensions: 34 mm (height) x 16 mm (diameter).  Battery voltage: 3.7 V, No memory effect  Charger input: DC 5 V/1-2 A  Charger output: DC 3.7 V/500 mA  Charger indicator: The red light stays on continuously while the battery is being charged, and the green light remains on steadily when the battery is fully charged or unburdened.    Battery usage: Flashlight, headlight, power bank, battery.  It can be used for children's toys, electric toothbrushes, electric shavers, remote controls, flashlights, wireless keyboards, wireless mice, alarm clocks, cameras, pocket calculators, gaming consoles, and electronic scales.    Note:  – Do not burn.  – Do not disassemble.  - Do not short-circuit the plus and minus poles.  - Do not expose to heat.  - Not fully discharged.  Do not force the lithium-ion battery in.  - Use only high-quality chargers.  - Fully charge before first use.  Store in a cool, dry place at approximately rated voltage.    Delivery contents  4 x Battery (no AA or AAA batteries)  1 x USB charger