Parasitic drain on 12V battery

[decrep]

Hi, Back to the 12 volt battery dying.
I have a 2021 MG HS PHEV. everything was fine until the service on the 20th January. Next time I came to drive, the car was dead.

I have heard, that when parts are in very short supply, the service people may sometimes swap the good part out from a new customer and put into one that's been waiting for a while.

With any luck they can continue doing this for a while, and keep charging for a new part that only gets used once, when it eventually arrives.

Hope this isn't what's happened to you, faults can appear straight after a service and it's just coincidence, but some times they've "accidentally" left a spanner in the works, means you'll be back for a new T-Box.

Sorry I just don't trust service organisations, some are fantastic, especially those in smaller towns that rely on local word of mouth, but I've been ripped off or attempted to be by larger franchises, that have a big brand cliental

Unfortunately, BEVs are just about locked in to franchise dealers!