My kid was prefishing today for a Sat. tourney. He hit his trolling motor first thing and heard a bang from the back of the boat. No smoke, motor still working. Batteries went totally dead within an hour. When he finally checked it out he found one of his batteries had half the case gone...melted, blown off, something. Any ideas? I told him to start by replacing all the batteries that are old, 3 years or so..Could have been bad.1550533971000167ac2287f038f0c40807766bd5a0b58a812c445f5922cf7001c0c3db9ef20a48afb195c5b945d82c2d.jpg