I received several good suggestions for battery box liners, and probably the best match for what I wanted was using Polyethylene (HDPE) or ABS plastic. Unfortunately, their costs were more than my "no more than 3 times the cost of plywood" criteria at $120+ for a 4x8 sheet, compared to the $20 I spent at home depot for some birch plywood.

So, I ended up just buying plywood to replace the existing plywood. It has been OK for 10 years, although it is discolored and starting to rot in a few places, so I figure it'll be OK for another 10 years, and it's certainly cheap enough that I can replace it when I replace the cells next.

Jay

On 08/06/2015 08:40 PM, Jay Summet via EV wrote:
I will soon be replacing the lead acid golf cart batteries in my truck
with lithium cells (from a Nissan Leaf).

Currently, the battery boxes are lined with (decaying) 3/16" plywood, as
well as 1/2" insulation foam on the bottom, as well as surrounding the
batteries.

I'm interested in replacing the plywood with something non-conductive,
and chemically inert (won't rot). It should be 3/16 (or thinner). I
think I'd prefer rigid material, but would consider spray tack adhesive
and a roll of rubberized material of some sort as well.

I plan on using the 1/2" foam again inside of it, so it doesn't need to
be very shock absorbing.

What suggestions do people have?  I'm willing to pay up to three times
as much as 3/16th plywood would cost, but the cheaper the better. I'd
prefer things that can be purchased at a Home-Depot or Lowes, although
I've ordered from McMaster Carr before....

Thanks,
Jay
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