I have a Rockwood Mini-Lite TT, upgraded from one 12V to to 6V GC batteries. The box I used is 3/16" PVC, nice HD construction. Two 6V GC batteries just shoe horn into it, as designed. Then I built a locking hold down for it as you can see.
My OEM battery tray just held the box, but with the taller 6V batteries, the batteries were too tall -- were bumping the front of the TT, so I cut the tray out and re-welded it 1.5" forward. I bought the battery box
here, and they have them to fit 12V batteries also
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