18650 battery is extensively used is many accessories.

Product Name: 18650 1200/2600/3000 mah Battery
Model: 18650
Nominal voltage: 3.7V
Discharge cut-off voltage: 2.5V
Charge: 1.50A, 4.20V,CCCV 150mA cut-off
Discharge: 0.2C, 2.5V discharge cut-off
Standard charge: CCCV, 1.50A, 4.20 ± 0.05 V, 150mA cut-off
Rapid charge: CCCV, 4A, 4.20 ± 0.05 V, 100mA cut-off
Charging time: Standard charge : 180 min / 150mA cut-off Rapid charge: 70 min (at 25 °C) / 100mA cut-off
Max. continuous discharge: 15A(at 25°C), 60% at 250 cycle