Ahh that might be it. If you have got some time just go grab a brew and let the battery charge up for a while, then come back. Mine was at somthing stupid like 11.5v and the buggar just said No lol

I’m so paranoid is now I’ve got a solar panel charger I leave connected when I go away for a week or two!

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E53 3.0d Sport 119,000 Miles
E61 535d Estate - Hybrid turbos and Dark-side intercooler...389hp,792nm