The FEIN 92604344020 GBA 18 V 2.0 Ah AS Battery Pack is a compact Li-Ion battery featuring a charge status indicator and Electronic Cell Protection (ECP) to protect against overload, overheating and total discharge. COOLPACK 1.0 technology helps extend battery service life and supports longer operating periods. Compatible with all 18 V cordless tools featuring the AMPShare or Bosch Professional 18 V battery interface.