Product Details:
Type: Li-ion
Nominal Voltage: 3.7V (at 0.2C discharge current)
Capacity:4200 mAh(Typical),
              4000mAh(Minimum) (From 4.2V to3.0V at 0.2C discharge current)
Charge Method CC/CV (Constant Current/Constant Voltage)
Charge Voltage:    4.2±0.049V
Charge Current:    2000mA×3hrs (Standard)
                             4000mA×2hrs (Rapid)
Discharge Current: 2000mA(Normal Discharge Current)
                             8000mA (Maximum ContinuousDischarge)
Discharge Cut-off Voltage 2.8V/cell

Operating Temperature
Charge:10 ~ +50°C
Discharge:-20 ~ +55°C
Non-operating Temperature -40 ~ +60°C
Relative Humidity Operating 10% ~ 90%
Non-operating 5% ~ 95%
Dimension
Diameter: 26.0 ± 0.5mm,
Height: 68.3
As Shipped Condition 3.70 ~ 3.85V
Recharge Conditions
Pretreatment
Discharge to 2.8V at 0.2C

protection:

PCB Protected against:
Overcharge (4.275±0.04V)
Over discharge (2.65±0.08V)
Over current (7-8A)