Norman_E
Well-Known Member
If you can't get a bigger battery in because width is the issue, and most seem to be about 175mm wide, the battery you suggest seems to be about the most powerful of ones that come out at about 125mm width. I suggest you try it. An alternative might be to use one of the existing larger house batteries to start the engine and simply add the smaller battery to the house bank. Against that is the possibility that the older batteries are not in perfect condition and putting one in parallel with a new battery might not do the latter any good. I trust you have a two output battery charger so that the batteries do not have to be connected in parallel to charge them.