Bosch Dual 18V and 12V Battery Charger - Dual-Bay GAX1218V-30
Bosch 18V Starter Set Charger AL 1830 CV and Two Batteries PBA 18V 2.5Ah, Black - Worldshop
Adapter(s) for Bosch Home (green series) 18V to Old Bosch 18V - AliExpress
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
Gloria Lithium-Ion Battery "18V/2.5 Ah BOSCH" - Bloomling International