The spare battery for the Fenix TK72R flashlight. This is a Proprietary Battery and ONLY works with Fenix TK72R Rechargeable Flashlight.
 
Features of Fenix ARB-L45-14000:    

• 7.2 Volt
• 7000 mAh large-capacity battery with outstanding performance
• The battery has triple over-heat protect for safety and reliability
• Built in over-charge, over-discharge protection circuit to ensure the maximum performance of the battery
• The circuit board has front and back protections to make it more impact-resistant and reliable
• No battery memory effect, negligible self discharge