Bosch BAT618 18-Volt Lithium-Ion 2.6-Ah Fat Pack Battery,Bosch,BAT618" /> Choose fat pack battery for best power and runtime. - Bosch litheon batteries guarantee maximum cycle life, minimum self-discharge and no deteriorating memory effect Bosch lithium ion batteries feature (ECP) - Electronic Cell Protection - prevents cells from overheating, overloading and deep discharging Double lock latching system - securely locks battery pack in Bosch high performance cells - extremely robust to supply high surge currents and minimum energy loss Bosch battery housing - fully functional after 6-Feet drop with external heat sink