Specially designed for the Tern Wear line this 30V lithium ion battery pack with charger powers the dual fan driven air-cooled vests. The battery can be run in four modes: 17V - 20V - 23V - 26V - 30V What&';s Inside the Kit 30V Rechargeable LiIon Battery Charging Cable (~4 hr full charge) Specifications Battery Type: Lithium Ion Voltage: Variable 17V - 20V - 23V - 26V - 30V Run Time: 4-11+ Hours (approx) Charge Time: 4 Hours (approx) Output Current: Max 3.2A Operating Temperature: 0AdegF ~ 104AdegF / 0AdegC ~ 40AdegC Charging Temperature: 0AdegF ~ 104AdegF / 0AdegC ~ 40AdegC Storage Temperature: 14AdegF ~ 113AdegF / 0Adeg ~ 40AdegC Water Resistance (Battery): Simple Waterproof Structure Not Guaranteed To Protect Against Submersions Battery Weight: 394g Run Time Modes Mode Voltage Level Approx. Runtime 1 17V 11+hr 2 20V 9hr 3 23 V 6 hr 4 26V5 5hr 5 30V 4+hrs