I was topping off our GC-2 batteries this weekend and found an every-so-slight bulge in the battery's casing. They are about three years old, and have really never done any real work (thanks to a variety of factors that kept us from spending much time at anchor). I have a Sterling 60A charger so I am not cooking them at all. In fact, I hope they are still near 100%. Anyway, I attached a picture. Is this something I need to be concerned about?
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