Battery Adapter for Einhell / OZITO 18V Li-Ion Battery DIY (There are versions with and without switch) Adapter Power Tools - AliExpress
Einhell Power X-Change 18V, 5.2Ah Lithium-Ion Battery Starter Kit - Battery and Charger Set - Universally Compatible With All PXC Power Tools And Garden Machines : Amazon.com.au: Garden
Power X-Change batteries and chargers | Einhell.si
Einhell Power X-Change 115mm (4 Inch) Cordless Angle Grinder With Battery And Charger - 18V Disc Battery Grinder For Cutting, Grinding And Polishing - TE-AG 18/115 Li Power Tool Set With Storage