Before buying, make sure that you have such batteries and Tool. The tool I work with.
Makita LXT 18V Battery - Fein 18V Tool Adapter ( Jadapters )
Battery Adapters for Einhell 18V Tools (JAdapters)
Battery Adapter for Einhell 18V Lithium Battery, Cordless Power Tool Converter for BL1815 BL1815B BL1820 BL1820B BL1830 BL1830B BL1840 BL1840B BL1850 BL1850B BL1860 BL1860B BL1845 BL1890 BL1890B
Total 20V Battery - Makita LXT 18V Tool Adapter ( Jadapters )
This battery adapter can make your Makita LXT 18V lithium-ion battery work on the Einhell 18V cordless power tools, no need to repurchase new chargers
Adapter For Makita LXT 18V Battery Convert to Einhell 18V Cordless Power Tools
Battery Adapters for Einhell 18V Tools (JAdapters)
Adapter (adapter) for Makita LXT 18V battery-to the Hilti 22v tool - AliExpress
Adapter (adapter) For Makita Lxt 18v Battery-to The Einhell 18v Tool - Power Tool Accessories - AliExpress
Adapter (adapter) For Metabo 18v Battery-to Makita Lxt Tool - Power Tool Accessories - AliExpress
EHB18MTL Electric Power Tool Adapter Converter For Einhell 18V Li-ion Battery For Makita Lithium Machine Replace BL1830 BL1815 - AliExpress
This battery adapter can make your Makita LXT 18V lithium-ion battery work on the Einhell 18V cordless power tools, no need to repurchase new chargers
Adapter For Makita LXT 18V Battery Convert to Einhell 18V Cordless Power Tools