I just replaced mine with a Mega Crank AGM battery from batterymart.com. It has great reviews from other HD owners. The CCA on this battery is 420, vs the 400 on the OEM, and for practically half the price. The bike cranks and starts very well now, the original never cranked and started the bike this fast, even when new.
I can't tell you how long it will last as I just put it in a month ago, but so far so good, knock on wood.
2015 Road Glide Special
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