Trying to sort out the mess that a Plug in Hybrid can get itself in.
Seems they have a 12V battery but only a small one so when you use an electric pump to sort the tyre pressures it flattens it very quickly and then nothing works. Mrs K was locked in the car for a while and then we were locked out of it as you have to part dismantle the door handle to use the manual key .
On the KIA the '12V Battery ' is actually part of the main traction battery but they have a 'boost' button or summary if it goes flat...
There's definitely two different batteries on Toyotas. The HV traction battery also starts the internal combustion engine so the 12V battery can be much smaller. And then as most driving is done on the traction battery there's no alternator charging up the 12V one. Instead there's a low current DC-DC converter. Sort of obvious in retrospect.
Now the internet says that converter only runs when the car is in 'ignition' mode but it appears to also run at least a little when everything is supposed to be off as the car slowly recovered functionality over the evening and night. Annoyingly at one point it wouldn't even let us recharge the traction battery via the cable as the car wasn't giving the 'OK to charge' message back to the wall charger.
The lesson learnt here is never run accessories off the 12V supply of a PHEV with the 'ignition' off.
Going to do a test drive next IF it will run, right now it's refusing to talk to the App.