Generally you can get "aftermarket" battery packs for power tools from the more well known suppliers, which are almost identical, just slightly different. Things like Makita 18V packs have a large clone market, mostly because of the price of the OEM part, and there are a few tool manufacturers who sort of standardised on older battery mounts, copying either Bosch, Dewalt, Makita or Milwaukee batteries, and making an entire range around them.
Makita 18V packs are common, and you find 3D models for the sockets available for use, plus plenty of suppliers of the battery packs, and also the sockets as well, so you simply clip in the battery. they lack some of the features, like perhaps a voltage monitor in the tool, but all generally include at least some rudimentary BMS in the packs. Just look for your local battery operated tools at the large suppliers, and look for the generic packs for them, which will be a start as to the one you choose.
For others the Sony battery system has many clones, that all interface with the cameras and such, and the same for Canon as well, Dave has done a video or three about his studio lighting, and repairing the battery systems on them as well.