The Lithicore 21700 Battery is a lithium ion rechargeable flat top battery and has a 3700 mAh rating. It features a 25 amp continuous and 40 amp max pulse discharge current. 

Features:

• Flat top
  
• Nominal Capacity: 3700 mAh
• Nominal Voltage: 3.7 V
• Discharge Current: Continuous 25 A, Max Pulse 40 A
• Lithium rechargeable battery
• 21.20 mm by 70.20 mm dimensions

Warning:

• Battery has potential to catch fire if mistreated.
• Do not expose to water or fire.
• Do not short circuit.
• Keep out of reach of children.
• Dispose if protective wrap is torn or shows any signs of wear.
• Do not carry batteries in pocket or purse containing metal objects.
• Transport batteries in proper battery case.