OK, just got back from Wrenbury 2009 - mayhem hosted as only Bryan and Suzy can. So we arrived Tuesday with our 6 year old 85Ah battery fully charged. The Truma heating went on and stayed on. We watched some TV and DVDs, with the gentle throb of 389 generators all around us supplemented by occasional growl of a V10 being warmed up. Two people offered us the use of their chargers - you just can't beat funsters. "Thanks but no thanks, we're testing our capacity". On Friday we depart. The battery reads 12.6V. So three days of normal freezing cold use and we'd have gone another two, probably but did not want to risk the weather closing in. What are you lot doing wrong then ? Are you eating electricity ? A load Frankenstein creations needing their electrical fixes. Beats me. Can't wait for the next test at Valentine's Day meet, also non-hook-up and no doubt cold.