After reading this when I mentioned the space for a battery my words suggest there is not one there....incorrect...my poor description, there is a battery there but not room for a second. However the clearance above the battery is several inches so I could put a bigger taller battery which has more amp/hours. Ive looked at dozens of battery sites and its confusing. Gel batteries, marine batteries,deep cycle batteries...as if Id ever use a battery that big when cycling in alabama..doh.
Just so you know the level of intelligence you are dealing with, Im the person who, (when fiddling about with all the gadgets instead of reading the instruction), opened a big valve under the rig that said black tank on it....wow did that spill out over the yard in a hurry...I read the instructions..realised what I had done and thanked the lord this rig had never been previously EEEWWWSSSed.