12V battery drained in 48 hours whilst locked

[T1 Terry]

One of these is very handy https://www.ebay.com.au/itm/2841233...bjtd8i0gnGqQh48ZwAYz5UKhYQ==|tkp:BFBMgN-bgfNm not saying to buy from that seller or anything like that, this is just an example link, but the Uni-T 203+ is a great tool for testing DC current flow without needing to disconnect any wires or terminals

Probably not technician standard accuracy, but it gives the used a good indication of just what is happening through a cable ...... and it can do all the other multimeter functions function the general handyman might need .... and the price is quite reasonable for the level of quality they provide .....

No, this was not a paid infomercial, the presentation would have been a lot flasher

T1 Terry

 

[Martinonline]

According to the manual, if there is a fault with the low-voltage battery charging circuit then the car will display a warning symbol. Unless someone has access to the charging circuit and software then finding the fault would be difficult.

 

[Rolfe]

I'm guessing it would be the same point it stops the V2L, 25% if I remember ...... I can't imagine it has a heap of different low SOC cut offs for each different function.

Either the MG smarts has determined the 12v battery is faulty because it can't seem to get it fully charged, or the "Intelligent" charging if faulty

T1 Terry

The lowest you can set the protected charge to for the VtL is 20%. However the car is supplied with a default setting of 50%, or at least mine was. As I discovered to my cost the first time I camped in it. The second morning the SoC was 48% and the VtL wouldn't come out to play. I had to wash in tepid water (with about a thousand midges swimming in it) and have Coke for breakfast instead of tea. I had no idea how to change it.

Back home, the forum directed me to the right screen. And I still couldn't change it because the slider wouldn't slide. Turns out you have to tap it. And the lowest setting it will accept is 20%.

 

[T1 Terry]

The lowest you can set the protected charge to for the VtL is 20%. However the car is supplied with a default setting of 50%, or at least mine was. As I discovered to my cost the first time I camped in it. The second morning the SoC was 48% and the VtL wouldn't come out to play. I had to wash in tepid water (with about a thousand midges swimming in it) and have Coke for breakfast instead of tea. I had no idea how to change it.

Back home, the forum directed me to the right screen. And I still couldn't change it because the slider wouldn't slide. Turns out you have to tap it. And the lowest setting it will accept is 20%.

I was close, missed by that much as Maxwell Smart would say

T1 Terry

 

[Martinonline]

It would appear that other manufacturers have problems with maintaining the 12V battery capacity. Hyundai and Kia have recalls for the Ioniq 5/6 and EV6 to software update/replace the ICCU (Integrated Chargung Control Unit). The part that maintains the 12V battery can fail completely causing, eventually, everything to stop. One fault cause was put down to voltage spikes at the starting and stopping the charging. An ICCU is believed to cost £4,000 as it controls all charging/V2L processes.

 

[Joningy]

I got a tray from AliExpress and the booster fits underneath it.

@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 UK, all delivery journeys this end, don't know how they do it for the price. Cheers for the tip off!