That good ol' keeping the 12V battery perky thread repeat.

Have you had any additional electrical devices (alarms, hifi, lights etc) or modifications to the car?
 
Make sure you had the SW upgrade to fix monitoring of the 12V system. Mine was effected by this and broke down. I was informed that if the battery does not recover i would be liable to pay for the replacement.
 
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jon0881 said:
Make sure you had the SW upgrade to fix monitoring of the 12v system. Mine was effected by this and broke down. I was informed that if the battery does not recover i would be liable to pay for the replacement.
Click to expand...

When was the update released, when was yours done ?

Thanks
 
mine was done after a breakdown in December and they said it had 3 SW recalls outstanding. Nice for someone to contact me about it!

the update wasnt specifically for that but it was on the bugfix list for a module update and been fine since
 
There's that word again - recall. There has only been one recall on the MG4 (for the locking in fix); everything else is a service campaign item. Dealers are just lazy and call them recalls, but they're not. :)
 
DaevM said:
Thanks for that.
Also, climbing out of the car drops it out of Ready mode 🤔, so no nipping in for a cuppa for half an hour while it goes through the Ready/charge cycle as per p.289 of the manual. Guess I'll just have to go for a drive then 😉👍
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It doesn't have to be in Ready mode with the MG4, as soon as it powers up it's charging the 12V, so go get your cuppa. 😉
 
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siteguru said:
There's that word again - recall. There has only been one recall on the MG4 (for the locking in fix); everything else is a service campaign item. Dealers are just lazy and call them recalls, but they're not. :)
Click to expand...
Actually thats a very good point. The arrogant lady on reception used recall and i said well why wasnt i contacted, she said its the DVLA that does that not us, take it with them. I checked and no logged 'recalls' for my car (lock in recall done).
 
nerfmg said:
The 12v battery charges when the big battery is charging from the mains. It also charges when moving. It does not start when unplugged and turned off.

After 1 week away at an airport car park my mg4 12v battery was flat.
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What was the SoC of your HV battery at the time?
 

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