If you are sure your charger is working, then I’d say its defo time for a new battery.
Does it do the same when in the van? i.e. is it not holding charge after a good run? Alternator ok?
Alex hard to say as I,ve just been doing runs to nursery and the odd jaunt to the trails 15 miles max and back all winter,had a inteligent spilt charger installed into the van to charge my leisure battery but does not seem to be charging the other one.
Neil if your passing that would be cool will not be purchasing one if I need to untill after the weekend as I,m skint.
Anyone know if the charger is ok, going to dissconnect now and charge the leisure battery.