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Your model of van should have a charger (but check the handbook). If you put the van on EHU it will charge the battery, after a fashion.  If it is dead, really dead, say registering 6V or less on multimeter, you will probably need a new battery. The charger in a van never fully charges a battery and so a caravan battery should be put on to a trickle charging leisure battery charger at least once a year, maybe more often depending upon how long you leave the van between trips. Over winter it should be removed from the van and regularly charged up during those winter months when the van is laid up.

A charger suitable for leisure batteries is a worthwhile investment

Phil

We learnt too late, we did try to charge ours but it had cells dead do was advised to change it. Learnt the hard way, as we forgot to put the onboard charger on so we ran a new one out even on electrics. Stupid we left the switch on whilst going form site to site without knowing what the darn switch was for. Not done it since.

 Taken out for winter as advised, just ticking it over with charge now and again trickling through

With some onboard chargers the surge would blow a fuse.  Better to remove and try on a trickle charger first.  Should tell you if it has gone altogether.

It's easy to forget that a status aerial (or any electrical item like a light) if left powered up will drain a battery after a while and the ongoing discharge might well damage it.  Most motor factors and some accessory outlets will test your battery for you once you have charged it up. Keep your fingers crossed because a leisure battery is not cheap.