Specs:

• Rated Capacity: 4.0Ah (Minimum), 4.1Ah (Typical)
• Rated Charge: Limiting 4.2A and constant 4.2V charge for 1.5 hours or 50mA at 23C.
• Rated Discharge: constant 0.84A discharge until 2.5V at 23C
• Nominal Voltage 3.6V 
  
• Shipping Voltage: >3.45V (approximate state of charge on arrival <30%)
  
• Internal Resistance: <15mΩ (measured by AC impedance at 1kHz)
• End of Charge Voltage: 4.20±0.05V
• End of Discharge Voltage: 2.5V
• Charging Time: approximately 90 minutes
• Maximum Charging Current: 8.4A 
• Maximum Discharging Current: 45A (this is NOT continuous)
• Operating Temperature:
• Charging: -20~60C
• Discharging: -40~60C
• Storage Temperature: <35C, recommended <23C for long term storage

What's in the case:

• 1 x Molicel P42A 21700 Battery