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ScottG

Bothell Wa.

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Posted: 01/20/22 03:39pm Link  |  Quote  |  Print  |  Notify Moderator

Vehicles that come from the factory with AGM's have a slightly lower system voltage. That is the reason they are not a good retro-fit for normal systems. The higher voltage seems to shorten their lives.

Grit dog

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Posted: 01/20/22 04:00pm Link  |  Quote  |  Print  |  Notify Moderator

ScottG wrote:

Vehicles that come from the factory with AGM's have a slightly lower system voltage. That is the reason they are not a good retro-fit for normal systems. The higher voltage seems to shorten their lives.


I can't refute whether AGM equipped vehicles charge at lower voltage, but my small sample size of AGMs in vehicles that did not come with AGMs does not support shorter battery life.
Best example is a set of Odyssey AGMs that started life in our boat(s) in 2009 and 2011 respectively.
In 2013 I put them in our 07 Dodge diesel. They lasted until the spring of 2020. So 9 and 11 years old. Dunno which was which, whether it was the newer one or older one that gave out, but I was pleased with the life of the batteries.


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RoyJ

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Posted: 01/20/22 04:27pm Link  |  Quote  |  Print  |  Notify Moderator

Usually you don't want to exceed 14.7V with AGM, as it may increase pressure beyond value safety settings, and outgas. That's a permanent loss of electrolyte.

Other than that, there's no reason why AGM can't be used in a specific vehicle. They're better than flooded in every way except cost.

dodge guy

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Posted: 01/20/22 06:09pm Link  |  Quote  |  Print  |  Notify Moderator

FLA batteries are the dinosaurs of the battery world! AGM and Gel batteries are the new and better batteries. No doubt LiFPo batteries are now the new way to go, but these for sure need the proper charging voltage, which is why you need a DC to DC converter to use them in the RV world so you don’t destroy them. I’m just starting to learn about them. But at $800-$900 each it will be along time before I consider one for my type of use.

When the MH house batteries are due I’ll be going with AGMs.


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dieseltruckdriver

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Posted: 01/21/22 05:53pm Link  |  Quote  |  Print  |  Notify Moderator

dodge guy wrote:

FLA batteries are the dinosaurs of the battery world! AGM and Gel batteries are the new and better batteries. No doubt LiFPo batteries are now the new way to go, but these for sure need the proper charging voltage, which is why you need a DC to DC converter to use them in the RV world so you don’t destroy them. I’m just starting to learn about them. But at $800-$900 each it will be along time before I consider one for my type of use.

When the MH house batteries are due I’ll be going with AGMs.

I switched my 5er to group 31 AGMs when it was really new. I have 4 years of use on them and I look at them a couple times a year to make sure they are still there. [emoticon]


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ktosv

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Posted: 01/21/22 10:19pm Link  |  Quote  |  Print  |  Notify Moderator

time2roll wrote:

For superior cranking amps and slight advantage on voltage, additional freeze resistance, faster charging, zero maintenance AGM is a great choice at a premium price.


That premium price isn’t as bad as it used to be either. I bought an AGM at Sams Club a year ago and it was only $60-70 more than the lead acid battery for our Suburban. Seems to perform as good as the Óptimas I used to buy.


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valhalla360

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Posted: 01/22/22 03:00am Link  |  Quote  |  Print  |  Notify Moderator

JKJavelin wrote:

valhalla360 wrote:

The real question is why bother for a starting battery.

The main advantage of AMG is they don't spill if you roll them over. Great on a boat or a stunt plane...not so much for a starting battery.

I would say the biggest reason is that they are maintenance free. A lot of people these days don't even know how to open the hood.
JK


I haven't seen a car/truck with a starting battery that requires adding water in decades.

Your average traditional lead-acid starting battery is already maintenance free and it's common to get 5-10yrs out of a starting battery.

So what exactly other than a significantly higher purchase price are you getting with an AGM?

PS: Deep cycle house batteries often do require topping up the water.


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blt2ski

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Posted: 01/22/22 08:50am Link  |  Quote  |  Print  |  Notify Moderator

The only people that would truly get any advantage with an AGM vs typical lead starting battery, would be those that operate with items needing a large battery draw. Such as snow plows, winches, night time off road lights, having an inverter installed for 110 use.... Being as AGMs can generally speaking handle more than 5-6 total discharges like a lead starting battery. Your chances of buying batteries prematurely lesson.
Like ALL things great and small, when we have more than one option, there are pluses and minuses to all the options. So depending upon the individual plus/minus, how they fit your individual needs, one can come up with a which is better.
Last fall buying a battery for my 1500, the lead bats had a upwards of double warranty lifetime, more cranking amps, both maintenance free......no AGM s in stock. Simple choice in my book. I was thinking about AGMs for some of the reasons I mentioned

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time2roll

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Posted: 01/22/22 09:19am Link  |  Quote  |  Print  |  Notify Moderator

Another AGM advantage.... can be easily shipped to you.


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Grit dog

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Posted: 01/22/22 10:08am Link  |  Quote  |  Print  |  Notify Moderator

time2roll wrote:

Another AGM advantage.... can be easily shipped to you.


So can SLA, sealed lead acid. IE maint free FLA batteries.

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