Robert M. Gary wrote:
The shop that does my annual repaints the battery box every annual. I'm
not sure why, my battery has never leaks. Its either preventative or
just an extra annual tax.

The paint they use on battery boxes is "acid resistant". It helps prevent
battery acid from eating a hole in the bottom of your plane. I have a can
of that paint that I use each year. I wash the battery box with a mixture
of baking soda and water, dry it, and re-coat it with a thin coat of the
acid resistant paint. In addition, I use compressed air to blow out the
vents. Incidentally, your battery DOES leak, you just don't know it
(unless you have one of the newer design "sealed" batteries). The act of
charging causes it to off-gas a vapor of battery acid. That's why battery
boxes have vents.


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