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More AI, this time from ChatGPT. Yes — on the MG S5 EV, the high-voltage (traction) battery does maintain the 12 V auxiliary battery even when the car is switched off and locked, but only periodically, not continuously. How the MG S5 EV handles the 12 V battery when off 🔋 DC-DC converter...

Thanks @Lovemyev @emmrecs @siteguru & @Martinonline and all other contributors. It may well be the charge controller, but it certainly charges the auxiliary battery, during HV charging, it also works correctly whilst in "ready" or drive mode, it certainly is NOT charging whilst switched off and...

The car was charged to 80% 2 days ago and was still the same this morning @siteguru , but in that time the battery drained to 3v, parked in the garage. So there's either a serious parasitic drain, or IF the HV battery is supposed to monitor & charge the auxiliary battery whilst asleep, then...

12v battery down to 3v again this morning (09/01/26) Phoned local Penton MG, because this points towards the HV battery not charging while the car is in switched off, I was told this is correct. I was under the impression the HV battery did charge, so long as the the HV battery SOC was above...

Got 3 basic testers Terry, all reading similarly, so good enough for what I'm doing!

@Ian Key My Armrest Storage Box & Center Console Lower Storage Tray, from Ali Express turned up yesterday Ian and fitted (perfectly) today, the armrest is by far the more useful, but both delivered in a week from China , both for £12.49p, including all delivery costs, pick up in China, flight to...

I fully understand what you say Terry, well not actually fully @T1 Terry 'caus I'm unable to correctly diagnose it, I don't have anywhere near the correct test equipment, I'm hoping Penton MG does! But I'm personally kinda pointing towards the possibility of some form of charging malfunction...

Snow chains work incredibly well, I've used them in the Alps!

That'll be fine, I'll pop in and video it at the same time, YouTube may recover the repair cost 😂😂 The days when we were able to repair the cars ourselves! No abs on the ole bus either. :ROFLMAO:

Well done Ian, have you tried it lately? imagine the neighbours faces if they were watching it. ;):ROFLMAO:

That is another point I've already put to my local MG garage @decrep, in my case the 12v battery suddenly went flat, now I don't know if it was a gradual decline which was unnoticed or a complete failure of something, possibly due to the battery management system, but whatever the cause it...

But "going dead" was exactly what happened to me last week Len, with the car garaged and turned off and nothing running for 48 hours, that is what this thread is all about!! Irrespective of any excuses or reasons why, no modern car should self flatten the battery if unused for this short time...

My opinion is RWD has many benefits over Front WD, having experienced powerful front wheel drive torque steer and other negative attributes, I'd much prefer RWD or 4WD over front wheel drive. Snow for us in the south is a rare occurrence, so it would not be in any way a decision factor in...

Yes as @Ian Key mentioned above, he and I and presumably lots of others with S5's found it very good indeed.

I did exactly the same today Ian, worked extremely well, but not until I tried to stop at a local road junction and kept going, nearly needing fresh undies. :ROFLMAO:

I thought the same thing Clive, But I'd guess most comms would be by email, if that's the case, Google Translate or similar would be widely used. But if a telephone call is required then as you say, language may be a problem, but wherever we go now, virtually everyone uses English. As I've...

I was told there are only 5 people in the MG HQ tech department answering queries, not only ALL of UK's queries, but they also look after Europe as well, no wonder we all think they are not interested in we consumers, they are simply rushed of their little arses All through MG keeping trying to...

Yet another update, are we getting somewhere? Just maybe. Several voltage readings and tests on my S5 12v battery over the past week or so. Now then I don't exactly suspect the 12V battery is faulty here, as it held up well whilst the negative lead was disconnected for 24 hours @ 12.85 Volts...

I remember someone who boasted 6 or 7 miles per kWh on this forum, even posted a photo, we can all do that if we zero the reading and freewheel down a hill as @Everest suggested. 😂

A lot of people are using those new fangled "tuned" calculators from China 😂