Those M12 battery packs look very close to this one I restored months ago:
There is no BMS in the above packs, also manufactured by Bosch I think (with references 2607336013, 2607336014, 2607336027, 2607336863, 2607336864, …). I think they're pretty much the same thing despite the slight differences.
Soon after I found some inexpensive 3rd party compatible packs which looked good, but who knows.
Take a look here: Looking for tips for rebuilding power tool battery packs.