Makita puts the protection/charge control circuitry in the battery pack, instead of in the tool or the charger. That makes their batteries more expensive, but you can't kill them by running them dry or through overheating in use. The pack itself will cut power to the tool. Makes them much more robust than the other common consumer/prosumer brands (not sure about pro brands like Hilti and Fein).

Though not uncommon this is simply a faulty product. Running them empty should not lock them out.

I left a battery on the charger for too long and it became a paperweight.

This kinda soured me on electric lawn equipment for a while.