More runtime. Longer life. Faster charging. The Milwaukee REDLITHIUM USB battery powers Milwaukee USB rechargeable products. The REDLITHIUM USB battery delivers more runtime, longer life, and faster charging. Get more performance with 2X more capacity than three AAA alkaline batteries. Eliminate the need for disposable batteries with over 2,000 charges for longer life. Get back to work faster with 3X faster charge times when charged by a Milwaukee USB rechargeable product or the REDLITHIUM USB charger. The Milwaukee REDLITHIUM USB battery is covered by a 2 year warranty.