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Old 03-27-2019, 10:23 AM   #15
DDW
Guru
 
City: San Francisco
Join Date: Apr 2018
Posts: 3,094
My trawler has the Blue Sea battery boxes (no longer sold but very similar to the Noco). They contain Lifeline AGM 4D batteries. The previous owner had the battery charger fail (a Xantrex 4 stage unit) which overcharged the house bank. It outgassed through the pressure vents, discoloring and corroding the terminals, cables, bolts, and everything inside the battery box. The damage stops right where the cables leave the box. Since the batteries are right next to the aluminum fuel tanks, I'm pretty happy the battery boxes were there, I have no doubt there would be significant corrosion on them if there had just been a tray or terminal covers.
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