Here is a pic of the battery pack assy. Highlight the link and do a "go to".

i27.photobucket.com/albums/c153/MosesWater/Pallet_Jack/Battery_pak_open_zpsce5c82e1.jpg

From the pic there is only 6" from the center tab to the back. The shelf is only 7". And there is 10-1/16" apox from the left or right to the center tab. I know a grinder can make an adjustment.

I was not able to locate any of the items listed. I found Trojan but those #s are not recognized. Same thing for NAPA.

But, Kevin, I do thank you.
I don't have a manual for the battery charger so don't know if switching to wet is doable.