3M™ Versaflo™ Battery TR-830 is our lithium-ion battery pack designed for use with the 3M™ Versaflo™ TR-800 Series Powered Air Turbo, Charges quickly (90 % charge in approximately 3.5 hours), Approximately 750 full charge/discharge cycles , Standard capacity rechargeable lithium ion battery , Mechanical attachment of battery to help prevent battery removal and spark risk during use per EN 60079-11 , Built in charge level indicator, Battery features bumpers to help absorb impacts, ATEX certified, CE and NIOSH approved