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I have literally replaced hundreds of batteries, and I have concluded that HD OEM batteries just last the best. I got seven years out of my stock Dyna battery before replacing it. Now, granted, I keep my bikes on a tender when they are not getting ridden daily, but thats just smart money. A battery tender is cheaper than a battery no matter how you look at it.
H/D dont make BATTERIES,TIRES,OIL or SPARK PLUGS!
Most likely they go to the lowest bidder is my guess.
But if you wnat to support the local stealer, knock yourself
out........Tenn.Vol.