Official specifications:

Nominal Capacity: 2,500 mAh

Nominal Voltage: 3.6V

Standard Charge: 1250mA, cut off: 50mA

Fast charge: 4000mA, cut off: 100mA

Max. Charge Voltage: 4.2 +/-0.05 volt

Max. Charge Current: 4000mA

Standard Discharge: 500mA

Fast Discharge: 10000mA, 20000mA

End voltage: 2.5 volt

Weight Max.: 47.0 g

Operating Temperature: Charge 0 ~ 50°C, Discharge -20 ~ 75°C

Storage Temperature: 1 month -20 ~ 60°C, 3 month -20 ~ 45°C, 1 year -20 ~ 20°C