Battery 18V 4.0Ah

Bosch BAT620, 18V 4.0Ah Battery.
Promotes unique cool pack design where advanced heat conductive housing keeps battery cooler, lives up to 2x longer, has an integrated fuel gauge (for fast and easy charge status), Cold weather operation (where battery will work down to -4 degree F), presents durable housing that survives 3 m drop and a flexible power system (FPS) that works with all Bosch 18V Lithium-Ion tools. The BAT620 is compatible with all Bosch 18 V Lithium-Ion power tools, radios and more. Maximum run time – up to 65% more run time (compared to Bosch 3.0 Ah).