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[TheBoy]

Do you know if it can be permanently disabled? I'd be up for that.

I've been told how to do it, I forgot to do hers when I had the trim off (as her stop-start has never switched the car off, probably due to shagged battery), but reckon its doable without removing trim.

I'll email you a pic

[Marks DTM Calib]

There is a certain connector by the battery you unplug to disable stop start.

As for a non AGM battery, these work as a very mild hybrid so have a very high amps alternator and do not take the battery above 90% state of charge normally, it then boosts the battery voltage under braking and backs off the charge rate when cruising (and uses some battery reserve). Hence the need for AGM.

Have you given it a good charge and updated the PCM and BCM software?

[Kevin Wood]

Thanks both. I'd seen that mod but held back because I wondered what else would be affected by disconnecting the VCM. I'll give it a go.

[TheBoy]

Have you given it a good charge and updated the PCM and BCM software?

No, no and no. In that order

With 100A load, it drops to under 10v, but holds steady.

[Marks DTM Calib]

Have you given it a good charge and updated the PCM and BCM software?

No, no and no. In that order

With 100A load, it drops to under 10v, but holds steady.

So its either down a cell or all cells are at a low SOC so needs a bloody good charge

[TheBoy]

I'll go and put some electricity in it now.  But not holding out much hope.

Reason for asking about non AGM is I have the old XJ battery still, that comes out as OK on the 100A load, and was only changed because the XJ is particularly fussy and throws weird errors with non perfect batteries.