Bosch Cordless Saw Advanced Cut (2.5 Ah Battery 18 Volt System, 18 In)(the plug charger is EU, if used in USA needs a plug adapter for the charger) - Amazon.com
Amazon.com: Labtec BAT609 18V 6000mAh Lithium Battery Replacement for Bosch 18V Battery 17618, 17618-01, 24618-01, 25618, 26618, 37618 Cordless Power Tools Battery : Tools & Home Improvement