Caused by 12v battery or something else?

HappyGoLucky

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Aug 4, 2025
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Location
Wales
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ZS EV
I will try and keep a long story short. 3yr old ZS EV had its service and MOT and all good. Charged that night on our home charger and noticed charging speed was right down to 4.2. Wondered if it could've been some issue with any software update at the garage, but thought I'd see how it was next time. 2/52 later, charged again at home and was getting the same speed, home charger has been checked and all fine. Had a plan to call the garage on Monday and get them to investigate.
I had a 2.5hr drive with my little boy the next day, 15mins into it, it came up with a yellow warning of "vehicle system control fault, consult handbook". All seemed fine, so I nervously carried on driving (nowhere safe ti stop). 25mins from our destination i had ALL the warnings and the red one of 12v, stop safely. AA turned up, couldn't get the battery to hold a charge, recovery truck took me and the car back home and family collected my son.
Garage states it was all a 12v issue, replaced the battery, said it was all fine. Went to pick it up and same yellow vehicle control system fault there, red 12v light, wouldn't start. They're now saying a fuse has gone in the CCU and that's the issue. I had to pay for a new battery (car is 3yrs old), which would be acceptable if that was truly the reason for it all.
However, I can see no reason why this would affect the HV battery charging speed?? And it all seems a little convenient that this all started immediately after the service and MOT?
Just looking for any advise or help, as I'm not sure whether I should be demanding a £225 refund for the replaced battery, if something else could have been draining / affecting the 12v and caused all the issues?
 
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