Nobody knows better than you that improving the productivity and efficiency of an entire team can save you time and money. When you go cordless with the Hoover HVRPWR™ 40V battery system, your team has the swap-and-go flexibility to seamlessly recharge and replace batteries among multiple uprights and backpacks without slowing down. Battery Type: Li-Ion; Battery Size: 40 V; For Use With: CH93619 Hoover Commercial Backpack Vacuum; Battery Capacity: 12 mAh.