The De Walt DCB360XJ offers the user extended runtime & maximum power to complete the toughest jobs quickly. Featured is an LED state of charge indicator that means you know exactly when your battery requires charging, allowing you to plan your jobs accordingly. It is ergonomically designed & gives the user an upgraded 4.0 Ah while still not increasing the size of the actual battery pack. There is no memory effect & virtually no self-discharge meaning maximum productivity & less time spent charging. It is compatible with all De Walt 36V Li-Ion tools.