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
1~4Packs 4.0Ah BAT411 Li-ion Battery for Bosch 10.8 Volt GBA12V30 BAT420 BAT411 | eBay
Bosch 12 Volt Battery | ExpertPower Direct
Bosch BAT414 12-Volt Max Lithium-Ion 2.0Ah High Capacity Battery , Black - Battery Testers - Amazon.com