All the issues referring to èste great pipe that is the Ford Transit are always complicated.
complicated to get spare parts
complicated is any modification in this regard
The theme of batteries in general and more of Ford is that they put all their models the fair battery. They do not give margin to alaminate something extra. And when winter arrives, the cold and more begin, if you sleep outside, you try to start it in the morning and minga ... it is missing. If you try noon, cdo gives something the sun to the sheet starts.
It will always do the same unless the battery is of that year placed. The original, the original size, does not reach the other winter.
Hces spend the winter giving it a touch with an external starter, (with the mass to motor block)
Or you buy a bigger one as I did (you must adapt the seat drawer, put it transversal on the fender) and have been almost three years old.
You are saying that you must regularly control the liquid in the battery plugs, if you miss distilled water, 1 cm on the plates.