Quote Originally Posted by Tooks View Post
It monitors 12v battery health/voltage, and uses a DC to DC charger to keep it charged from the traction battery if necessary.

Most modern EVs do to be fair, although VW and Hyundai struggled with their implementation of it initially, but it’s sorted now.
Unfortunately, my daughters MG ZS EV doesn’t and had a flat battery on our return from Lanzarote in November.

Fortunately I have a set of jump leads in the wife’s car so was able honour enough charge in the 12v battery to power up the electrics, at which time the traction battery took over.