REDLITHIUM USB (universal serial bus) battery powers Milwaukee USB rechargeable products. REDLITHIUM USB battery delivers more run time, longer life, and faster charging. More performance with two times more capacity than three AAA alkaline batteries. Eliminate the need for disposable batteries with over 2000 charges for longer life. 2 year warranty. No. 48-11-2130: Type: USB, Battery Power Type: Lithium-Ion, Warranty: 2 Yr., Pkg Qty: 1, Package Type: Clamshell