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Default @#$%^& Duralast AGM Batteries !!!

Autozone's Duralast ETX16 AGM batteries!!!

When I bought this '83 XLH back in May 2019 it came with a Duralast ETX16. In two weeks, it went tango-uniform! So, since Autozone was closer than the local H-D rip-off store, I bought another ETX16. 325 cold-cranking amps, It lasted until July 2020 when it also bit the big one. And, like a dummy, I bought another one. It just gave up as well!!!

Is it just that AGM batteries only last a year???

I had my local mechanic check out both of the ones I bought. They both failed the load test.

Now I'm not sure to get another AGM (not a Duralast) or a classic lead-acid battery. I was thinking a Yuasa YTX20H-BS. 310CCA and the same dimensions as the Duralast. I Searched the threads here and there seems to be no consensus on AGM vs lead-acid batteries. Some like AGM, some like lead-acid.

I'm so confused...And my faith in Autozone is forever crushed...
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For some time I have used only AGM for all applications (including truck, travel trailers, etc)

They are more expensive than wet lead-acid, but have many benefits, including

longer life
vibration resistant
truly maintenance free
no acid spills from a lay-down

Not a fan of AutoZone, but use O'Reilly for automotive AGM.
Three year warranty, but in the desert only last about 2 1/2 years in car or truck.

All the better if you can find a vacuum filled AGM

https://www.eastpennmanufacturing.co...eries-1927.pdf

When Dekka made H-D batteries, I understand (post by Reddtigger) that H-D specified vacuum filling.
More expensive, but good battery.

http://xlforum.net/forums/showthread...um#post5650298
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Quote:
Originally Posted by IXL2Relax View Post
Here's the Sportsterpedia section on Batteries:
http://sportsterpedia.com/doku.php/techtalk:ref:elec03
I was surprised to see that voltage/charge chart...

I'm looking at my multi-meter and even after charging for 4-5 hours, this Duralast AGM only shows 12.51v...~60% charged...

Last edited by ferretface; 1 Week Ago at 03:21.. Reason: oops
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While flooded batteries do require maintenance, if taken care of properly this battery type will last longer than many of their counterparts.

AGM Users should take care when charging this battery as over and under charging can affect their life and performance. AGM batteries perform most reliably when their use is limited to the discharge of no more than 50% of battery capacity.

"I pulled this from a battery comparison. I've had people tell me that AGM's require a reliable and consistent charging system. So if you have an older style charging system, it may not be recommended for an AGM battery. Write AutoZone a letter, they may just refund your money or give you a free replacement or in-store credit."
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I tried to use AGM's in my sidecar for a couple of years.

They died on a regular basis. I was using them in a dead loss system that only ran the ignition. I was charging them with a good charger - not at the track with genset voltages.

I (along with others I know) gave up and went to LION's. They never failed me and I still have two that work fine from 6 years ago.

I bought the sewaled lead acid replacement for the original HD battery about a year ago and have had zero issues with it. But batteries, who knows ?
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Quote:
Originally Posted by Toejam503 View Post
AGM Users should take care when charging this battery as over and under charging can affect their life and performance.
Yes, best to not charge over 14.4 volts (2.4 volts per cell), whereas normal charging systems are 14.3 +/- 0.5 (up to 14.8)

https://batteryuniversity.com/learn/..._glass_mat_agm

But they do perform well in cold temperatures.
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Quote:
Originally Posted by Toejam503 View Post
While flooded batteries do require maintenance...
That was the issue with travel trailers parked at our ranch.
Adding distilled water twice a year was OK, but the sulfuric acid fumes in the battery boxes were a corrosion problem. Had to completely replace the fuse panel on one and relocate/modify on another.
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Quote:
Originally Posted by Ferrous Head View Post
I tried to use AGM's in my sidecar for a couple of years. They died on a regular basis. I was using them in a dead loss system that only ran the ignition.
Yep, as Toejam pointed out, discharging more than 50% can be a killer.
OTOH, the two AGMs at our ranch are well over 3 years old and are generally drawn down to 12.5 vdc running LED lighting, water pump and charging cell phones. Then, during the summer, common to see 15 volts on the meter after a month charging by a low wattage solar panel.
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Quote:
Originally Posted by Ferrous Head View Post
I (along with others I know) gave up and went to LION's. They never failed me and I still have two that work fine from 6 years ago.
Lithium ions are smaller, lighter, longer life, but need warming in cold weather before energizing a starter...and have a price.
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Now I'm even more confused...Summit Racing stocks the Yuasa YTX20H-BS but has this to say...

"Battery is sold dry. Customer must fill battery with included acid and charge before battery can be used."


They go on to say in Item Description - "They are permanently sealed, never need refilling, and are ideal for motorcycles..."

https://www.summitracing.com/parts/ysa-ytx20h-bs

WTF!?!? Are they sealed or open and require filling??? One of the customer comments says that "battery comes dry. Best results when you add the liquid and let it sit 2 hours BEFORE throwing it on a charger. Low amp charge overnight is best".

This site [Summit] is the only one of a half-dozen I've read that states that the Yuasa AGM requires filling...
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