This is a ready to use 3d printed adapter(only) to use your Bosch Nicad tools with Milwaukee M18 batteries. NO modifications to your tools or batteries and it locks in place. I can't say it fits on all of the Bosch 18v Nicad tools but it does work on all the tools in the pictures.
Dewalt Battery Adapter Kit 18v Tools Makita Battery Milwaukee Tool Adapter - Bat618 - Aliexpress
Bosch 18v Nicad Battery to Makita Lithium Battery Adapter
This is a ready to use 3d printed adapter(only) to use your Bosch Nicad tools with Makita Lithium batteries. NO modifications to your tools or
Bosch 18v/24v nicad battery to Makita lithium battery Adapter
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Bosch 18v nicad battery to Milwaukee M18 battery adapter
Bosch to Milwaukee Battery Adapter - Powuse
Li-ion Battery Converter Adapter For DeWalt For Makita For Bosch For Milwaukee M18 Hitachi For Metabo For AEG RIDGID DEVON Worx
DM18BSL BPS18BSL MT20BSL Li-Ion Battery Converter Adapter For Makita/DEWALT/ Milwaukee/Black&Decker Battery to for Bosch 18V tool - AliExpress
Bosch 18v nicad battery to Milwaukee M18 battery adapter