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: Bosch 1600A005B0 Battery Pack PBA 18V 2.5Ah W-B, 18 V, Black : Tools & Home Improvement
Bosch Genuine GREEN 18v Cordless Li-ion Battery 2.5ah and 3A Fast Charger | Battery Packs