3M Battery TR-621 High capacity Versaflo™ (TR-600 PAPR)

3M™ Versaflo™ TR-632 High Capacity Battery, lightweight high capacity lithium-ion battery for use with the 3M™ Versaflo™ TR-600 Filter Unit, it charges quickly (recharges in less than 4 hours) and includes an indicator of charge level, the battery charge level is easily visible, can be rinsed for easy cleaning or can be submerged temporarily.
The system has a battery life of 9.5 to 19 hours