John Rumm wrote:
There will usually be a BMS in the pack on any respectable battery,
however some also communicate with the device - perhaps allowing the BMS
to instruct the tool to shut off or passing thermal data from the tool
to the batt (this is conjecture - I have not studied what passes on the
additional pinouts on the batteries)

That's pretty much how it works in this Aldi pack/drill:
https://www.youtube.com/watch?v=2d6iggXptNc

The BMS handles the battery monitoring (a bit sad he didn't take that
apart), but the drill has its own cutoff circuit if the battery is over
temperature.

Theo