Nitecore Battery NL2155HPR 21700 5500mAh USB-C Rechargeable

Features:

• Size: 21700
• Chemical: Li-ion / Lithium-ion
• Capacity: 5,500mAh 3.6V (19.8Wh)
• Dimensions: Length: 77±0.3mm, Diameter 21.8±0.3mm
• Weight: 75g
• Built-in USB-C charging port with dual LED charging indicators
  

Warranty : 

1-year warranty from the date of purchase. Overdischarging or battery leakage is not covered nor is fast draining of battery while using. Please keep the voltage of all Li-Ion batteries above 3.8V for healthy storage. Recharge as soon as possible when you have run them down. Storing a depleted ( less than 3.2V open voltage ) battery may permanently damage/ shorten life/cycle.

See in the official website: http://flashlight.nitecore.com/Product/nl2155hpr