Put it on a slow charge so that you don't boil the battery fluid,make sure it is topped up ,but not overfill,if after charging it looses it's charge off load then a new one is the only answer.
David, thanks for your prompt reply. the charger i have wont even attempt to charge it as it has a safety feture to stop charging if under 7 amps !! im just wondering if its goosed and we go away in the morning.