DEWALT DCB184 18V 50AH XR LITHIUM ION BATTERY PACK WITH CHARGE INDICATOR TWIN PACK Delivering 66 more runtime than a standard 30 Ah battery pack The batteries phave an LED state of charge indicator to help manage pack charging They have a lightweight design that provides the user with upgraded 50 Ah Power without increasing the size or weight over the 18 Volt 30 Ah battery pack No memory effect & virtually no selfdischarge for maximum productivity & less downtime They have protection against overheating overloading & deep discharge conditions which increases the overall battery life