I am wanting to fit a leisure battery to my overland build and wondering if I could fit under the bonnet. I was wondering about the possibility use two smaller batteries to replace the two whoppers that are in there - thus taking up one battery location and then using the other space for a leisure battery. Are there smaller batteries (optima?) available with same CCA as the large ones? Although the leisure battery could in theory also be used in the starting circuit if necessary Any thoughts?