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Keep an eye on wires on the inside of the rear fender.
AGM?Mine died overnight with zero signs of giving up at 10 years to the month. Daily driver and never on a charge…My guy at a local bike shop shrugs his shoulders about batteries. He says there’s no rhyme or reason to it
I forgot about sitting forever. I'd get out the deoxit and soak down the key switch, relays, fuses, remove the grounds etc. I got this battery at a very reasonable price on amazon or ebay several years ago it's 240 CCA works great.
To keep batt good you only need to charge it 1 day a month.