My 2016 Puma has the nice battery trays in it and I just spent some trying times replacing the 4 batteries with 31 series AGMs, which leads to my suggestion. The posts that attach to the bottom and have the cap bolted on at the top could be a bit longer, like 1" or so. It would make the process much easier to get the top back on and the lock washers and nuts in place. Just my thoughts.