A bloke with too many hobbies.
We have quite a few low cost Ozito (Bunnings) battery powered tools around here even though I've been transitioning to Makita. The battery packs put out about 20V when fully charged which is too much for nominal 12V radios. I purchased a variable buck converter that can regulate this voltage down.
To get power from an Ozito battery I butchered a spare single battery charger with pins like this: