To seal it I used o-ring to seal it in the inside then used sealer around the outside of the cover.
battey box http://www.thingiverse.com/thing:331394
a couple issues with tipping too far too the back I plan on releasing a v2 with fixes otherwise just use the one with the quarter holder if it bothers you
used wood screws
Printed at 15% infill might want to do more to make top heavier
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Print version with quarter holder to help with weight issues