I've looked back over recent battery posts but nothing obvious helps. I park up my N reg HSE RR outside the house and take of for a week's Red Sea Scuba holiday and when I get back it is flatter than a very flat thing. Not: won't crank but: nothing even glimmers.
The battery is 70AH and a year old. Is there something draining it that I can unplug? Assuming it was reasonably charged when I left it to kill it like this implies nearly half an amp of drain but when I charged it and put it back nothing seemed to be drawing.
What am I doing that's stupid here?
nigelH