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Johnson Controls sold by AutoZone is another US manufacturer, but I have read many negative reviews compared to the Big Crank / East Penn.
I've had good luck with both the HD batteries, and the "Big Crank" from Batterymart, both made by DEKA. Excellent reviews on the Big Crank. Horrible reviews on the Johnson Controls made batteries.
O'Reilly's carries a battery that looks identical to the Big Crank, and carries the same part number (ETX20L) for maybe ten bucks more (plus sales tax) if one can't wait a few days for shipping (free) from Battery Mart.
I use the 20 series AGM batteries from Walmart for $78. They are made by Yuasa the largest mater of power sports batteries in the world. That is about half of the HD battery at a dealer.
You are never very far from a Walmart. I do get 7 to 9 years out of the stock HD batteries as I do with the Everstart brand. But then I take care of them by having them on the tender until I back out the garage and plug back in when I return. I have 19 HD's and use a couple of gallons of StaBil and 19 of the Schumaker 1.5 amp tenders from Walmart at $20 per unit.
I simply do not have battery problems. When one is close to the end of its life the starting is just a little weaker and that is the clue to get a new one.
Last year I bought one of the new Lithium Iron batteries. It' actually a LiFePO4 Power Sports Battery. Anyway, it is much lighter than the stock battery. It fires up just fine and has been in service for over a year. I like the technology. The price was just over $300. I hope it lasts longer than the stock battery. I got three years out of the original and the first replacement battery.
I use the 20 series AGM batteries from Walmart for $78. They are made by Yuasa the largest mater of power sports batteries in the world. That is about half of the HD battery at a dealer.
From what I've read (read only) the latest Walmart batteries are no longer made by Yuasa, and are getting very poor reviews.
Last year I bought one of the new Lithium Iron batteries. I like the technology.
Like you I'm a fan of the technology but I'm not sure I'm ready to rely on it.
I do have lithium Ions for my cordless tools and I have a Antigravity Batteries XP10 lithium micro-starter that I keep in my saddle bag.
The problem I have with lithium ions is they don't give any indication that they are about to die, they just die.
At least that's how my power tool batteries are.
With a non-lithium you get some indications such as a slow turn-over that gives you a little heads up.
There's also the $300 price tag.
At 3.5 years per AGM battery $300 is more than 10 years of batteries.
I wonder how many of those people used a regular battery charger for their AGM battery? AGM's are susceptible to over voltage charging and have different charging characteristics than lead-acid batteries. I'm using a BatteryMINDer 2012-AGM charger which comes with the connector Harley puts on their newer bikes so no adapters needed.
I wonder how many of those people used a regular battery charger for their AGM battery?
I think you may have a good point in that using a tender on a regular basis probably does help the battery.
It certainly wouldn't hurt.
I'm betting that the vast majority of people don't use a tender when they are not riding.
I've never used a tender during the regular riding season but always use it during the off-season since sometimes it's weeks between rides.
Perhaps I'll start using it on a more regular basis.
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