Milwaukee's REDLITHIUM? USB 3.0AH Battery provides more runtime, longer life, and faster charging. This USB 3.0 battery pack delivers up to 20% more capacity for Milwaukee USB Rechargeable solutions compared to the First Generation REDLITHIUM? USB Battery (48-11-2130). With higher capacity, users get longer runtime and more power for performance in every MILWAUKEE? USB Rechargeable solution. Eliminate the need for single-use batteries with these USB rechargeable batteries that deliver more charges for longer life out of a single battery pack. You'll get back to work faster with 3X faster charging times when using a Milwaukee USB Rechargeable product or the REDLITHIUM? USB Portable Power Source & Charger (48-59-2012). Our REDLITHIUM? USB 3.0AH Battery is covered by a 2-year warranty.