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I would like to see the result of husbands test before suggesting anything.

The battery should last even if it's only on EHU charge.

How many amp-hours is the battery

However - just one suggestion - One possibility is the conections to the battery - are they clean and tight ?

at 12 volt the battery is flat.see

http://www.a-tconsulting.co.uk/caravan_tech/understanding_your_caravan_battery.html

Quote: Originally posted by daisydaisy on 24/8/2013

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.....Since I posted this he left all lights on for 8 hours and although the indicator light glowed red all this time the lights were still all working.

At start of test the battery read 12.7, he used 3amps (4 lights) and after the 8 hours it read 12.0.

I suppose if nothing else we can now stop worrying it will pack up at any time and ignore the red glowing light.

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To me your battery sounds fine. Stop worrying.....

If you 'bled' the battery on 3 amps for 8 hours and it is still working - you are probably fine.   As birder99 said - that is 24 amps.

Next time try to get it over 50 amps - leave the lights on for 24 hours - if the lights are still on then the battery is good.

I imagine you did buy a leisure battery and not a car battery. They are made differently - car batteries don't like being fully discharged .  - it can warp the plates but they can give a high output for a short period . Leisure batteries have better insulation between the plates and don't mind being fully discharged but they don't like large demands.