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I have used an 85 since 07 and never had any problems.  The battery showed signs of deteriration at the last service and it was changed - to an 85 again.  There is no more 'power' per se, only that the battery lasts longer ie 1 amp for 85 hours or 85 amps for one hour as a simple rule - albeit it is a very simple rule and the battery will run out of juice before it is fully discharged. 

If the 85 battery ran well enough until its demise, then why change, but if you wish to wear belts and braces and a piece of string go for the biffer one.

NB  the bigger the battery the heavier it will be  NB nose weight -  it will not necessarily last longer before you need to replace it.

We've only ever had Powertouch Movers. I called Powertouch to make certain which mover to specify and the man there told me an 85ah battery would be adequate plus he said the battery would be smaller and lighter.

The dealer told me the 110ah would be better so I went with that on our last new van. It was fitted by the dealer and when I took it off the van for winter charging I wished I'd stuck with the 85ah because the 110 just fitted into the battery box whereas the 85 fitted in there with ease.

I guess it depends on your usage of the van, we always had EHU pitches so our batteries didn't have to run the van at all without support.

BB