I stored it in my basement over the winter.
Wet cells self-discharge, and if not constantly topped off with a maintenance type charger, the plates start to sulphate. That will kill the battery prematurely. A wet cell battery may self-discharge as much as 1% or more a day. If it was topped off completely when you stored it... that means it was at less than 10% charge by winter's end—that's assuming a three-month long winter—winter up in New England is more like five months. If it wasn't topped off when you stored it, it was sitting at zero charge for who knows how many weeks.
I generally go re-charge my batteries once a week when the boat is in storage over the winter. I could probably go once every two weeks...but why risk it.
Equalizing it might help it...but I kind of doubt it. Neglect kills far more batteries than anything else.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.