Tenergy 3.6V Li-ion Protected 18650 3400mAh Protected Button Top Battery

Fully Protected Battery: Built-in protection circuit with top quality Japanese IC, protect against over-charge, over-discharge, and over-current.
Ultra High Capacity: True 3400mAh capacity prolongs runtime to any application. (Note: We strongly suggest against using this battery in E-Cigarettes or Vape Mods.)
Button Top Design: Protruding positive terminal creates solid contact when connecting batteries in series or installing in equipment with flat circuit board that are incompatible with flat top batteries.