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Update Charged 12V aux battery and took a couple of short trips including running petrol engine. EV sys service warning disappeared during first trip and hasn't reappeared so doesn't appear to need battery disconnection to remove. 12V battery now looks to be holding charge so might not need...

Thanks for advice both, will wait until after Xmas. Haven't found a supplier with correct AGM battery yet, so will limp along until I get one. Sounds like no point in connecting parallel 12V battery whilst replacing, so that hopefully warning will be removed. I didn't intend taking to...

Cautionary tale re Aux battery Flattening - Don't hit Start button I have just had similar experience to Solargen (above) during England's hard freeze last week. Hadn't used my 2014 PHEV for a couple of weeks but main battery was nearly fully charged. In dying afternoon light and about minus...