How can I prevent my Volvo S80's battery from going flat when left?

I have a Volvo S80 D5 and when I leave it, say, at an airport for more than about 12 days, the battery goes flat because I can't see how to lock the car without using the remote. I can buy a battery backup to keep in the car but have you any suggestions?

Asked on 10 August 2010 by chris217

Answered by Honest John
Yes, you could buy a booster from a car accessory shop.
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