A bit more info for that useless info file we all maintain just in case  

If your looking for a battery charger to keep that van battery up to speed then chose one that  id auto multi stage and has an amp rating not less than 10% of the Amp Hour rating of your battery  Eg;  100 AH = 10 Amp charger .

Under or over charging lead acid batteries can stuff them up real quick

Sealed batteries can be charged at a higher rate .