MAXIMUM RUNTIME. LONG LIFE. FAST CHARGING. The MILWAUKEE REDLITHIUM™ USB 2.0Ah Battery powers MILWAUKEE USB Rechargeable products. The REDLTIHIUM USB Battery delivers maximum runtime, long life, and fast charging. Get more performance with 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 faster charge times when charged by a MILWAUKEE USB Rechargeable product or the REDLITHIUM USB Charger. The MILWAUKEE REDLITHIUM™ USB 2.0Ah Battery is covered by a 2 year warranty.