MG HS Hybrid battery drain

[Murphy14]

Hi I took delivery of a new MG HS Hybrid on 27/6/2025. I have had to call MG assist 4 times due to flat battery. The car is going back to the dealer, but have requested a replacement vehicle.
Has anyone else experienced this problem?

 

[salty]

To the forum. Not a good start to new MG ownership. Hope it's sorted soon.

 

[JMC]

Hi I took delivery of a new MG HS Hybrid on 27/6/2025. I have had to call MG assist 4 times due to flat battery. The car is going back to the dealer, but have requested a replacement vehicle.
Has anyone else experienced this problem?

Hi.
I have the same issue. I live in France.
I got my new EHS 3 weeks ago and already 2 flat batteries.
My car is at the garage for investigation..
Do you know the root cause?
Thx

 

[Brommy69]

Hi I took delivery of a new MG HS Hybrid on 27/6/2025. I have had to call MG assist 4 times due to flat battery. The car is going back to the dealer, but have requested a replacement vehicle.
Has anyone else experienced this problem?

Same here. HS PHEV TROPHY. Picked up 22/6/2025. Back at dealer due to three flat batteries. Something is draining the battery when it's stood with ignition off. A faulty component no doubt.

 

[sheepy welshman]

Hi, same issue here. been told the issue is the backlight on the infotainment screen not turning off when car is locked. Causes 12V battery to drain to flat. Software fix due 21st of July according to dealer. Attempts at replacement CCU (infotainment control unit) has failed to fix issue (obviously as firmware is issue and will be the same).

 

[Coulomb]

Attempts at replacement CCU (infotainment control unit) has failed to fix issue

Actually, the CCU is the Combined Charging Unit, a very expensive device. Cowboys; that has cost someone dearly. They must have thought that the DC-DC (part of the CCU) was not charging the auxiliary battery, but it's trivial to figure out if that's working or not.

 

[sheepy welshman]

Actually, the CCU is the Combined Charging Unit, a very expensive device. Cowboys; that has cost someone dearly. They must have thought that the DC-DC (part of the CCU) was not charging the auxiliary battery, but it's trivial to figure out if that's working or not.

that'll teach me for re-spouting what a service advisor says.
under warranty so didn't cost the customer a penny thankfully. i would have thought just turning the car on without the engine kicking in and checking battery voltage would do the trick. but my knowledge of cars extends to changing the brakes and oil/filters.


It's a shame as the car is a big step up from previous MGs in quality of finish. but seems to be a widespread issue my local dealer had at least three in at the same time as mine and I've spoken to another 6 local people with the same problem. i suspect that will rise quickly though.

personally if the update doesnt fix mine I'll reject it as a lemon.

 

[Brommy69]

that'll teach me for re-spouting what a service advisor says.
under warranty so didn't cost the customer a penny thankfully. i would have thought just turning the car on without the engine kicking in and checking battery voltage would do the trick. but my knowledge of cars extends to changing the brakes and oil/filters.


It's a shame as the car is a big step up from previous MGs in quality of finish. but seems to be a widespread issue my local dealer had at least three in at the same time as mine and I've spoken to another 6 local people with the same problem. i suspect that will rise quickly though.

personally if the update doesnt fix mine I'll reject it as a lemon.

Same issue with mine. The dealer contacted MG and they have told them there is a batch with this issue. He said the fix is due 14th to 15th July. I have everything crossed it fixes the problem or I will also be rejecting it. Despite the dealer going pale when I mentioned it