These Dremel and Bosch batteries are functionally identical, but a piece of plastic is reversed on top, preventing them from being interchangeable. : r/assholedesign
Bosch Professional GRO 12V-35 Cordless Rotary Multi-Tool (Without Battery And Charger) 「International Version - No Warranty」 - - Amazon.com
Bosch/Dremel/CST Berger/RotoZip Battery Cover #BSH-1618C01707 - Tool Parts and Accessories - PartsWarehouse
Dremel 8260 Cordless Rotary Tool is “Smart” & Brushless