The 20V MAX* XR® POWERPACK 4Ah Battery deliver 50% more power and a longer lifespan*. Engineered with tables cell technology, our best performing 20V MAX* 4Ah battery¡ powers through tough jobs, day in and day out. XR® POWERPACK batteries are a part of our best performing line of 20V MAX* batteries and are compatible with 20V MAX* tools.