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No. They will flatten any battery, either car (with the engine off) or leisure type in a couple of hours.  You need electric hookup & a transformer, that lot will set you back about £70 on top of the coler unless you get a mains/12V one.

Steve.

Most modern cars dont power their 12v when the ignition is off for any length of time

I know its a bitter pill to swallow - but im currently looking into this - and from waht I can gather - you are much better ( space allowing ) with a 3 way cooler / fridge that allows you to use gas for when there are no EHUs -   expect to pay £170 ish - but thats got to be better than faffing ablut with batteries ( £70 ) and transformers - not to mention the odd flat car battery - ect

Simon

We've just bitten the bullet and bought a Combicool RC1700 - £178 including postage.  Ordered yesterday and arrived this morning.  Have got it plugged in and waiting to see what happens (it gets cold I hope!!). 

Our 12v cool box with transformer blew up last summer at Annecy, we think it just couldn't take the heat.  Also we found the fan very irritating especially at night and worried that it would disturb other campers, so often turned it off.

Am probably camping sometime in the next couple of weeks in the UK too, and want to go without EHU so need to try out the gas too.

Sharon