BPS

I.e. should not be going off after batteries are full/drained.

Supplemental should have UV protection.

Things like button cells and other batteries that do not control the operation of the car do not count as supplemental batteries.

Charging the supplemental battery from main pack is allowed, but must have active protection. Otherwise, only passive UV protection is required.

Applied at negative end due to better thermal contact with sensors.

MSXV here we come