All depends on how much use for how long?
Remember these are for caravans to power lights for the weekend etc...
So I think 85ah (about £45 - £50) should be more than ok for a days charging, 110ah (£60 - £65) if there's going to be more than one charger I suppose.
I borrowed an 'old' car battery which had been in a mates garage for a year or so in the summer. It was dead but charged ok and I ran a charger all day and soldering iron on it and it lasted.....but how low until it knackered, i'll never know.
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