In the typical car or truck the battery box may be nothing more than a tray to support the battery. But there’s more going on in the battery box in most aircraft—and it might not be good. Neglect can lead to unnoticed airframe corrosion, engine starting problems, audio system noise and other electrical system problems.
Part of the problem is that some of the OEM boxes weren’t made to withstand the harsh conditions to which they’re subjected. That makes routine and careful inspection critical. And when it’s time to replace one, hold on to your wallet. The good news is that modern battery boxes are much improved over older ones.