Do AGM's charge quicker?

BFL13 wrote:
Yes, or else Lifeline AGMs have way lower impedence than the other brand AGMs, so they can take way more amps at the same voltage and SOC

Just take a quick look at their spec sheets - it's usually listed right there along with the other data. At least it's that way with Fullriver and Lifeline.

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P.S. Lifeline may be the only AGM manufacturer that talks/brags about accepting extreme charging currents - while other AGM manufacturers may choose to not encourage their customers to do so - even though it might be just as possible with their AGM batteries as it is with Lifeline AGM batteries. :h

MEXICOWANDERER wrote:
You need to talk my batteries down then, because both want in excess of 100 amps at 14.4 initial.

Or am I using invisible ink? I've stated this several times on this thread.

Not disputing that. I do wonder why Lifeline seems to be the only one with such high amps acceptance. As previously posted, even Rolls has a max limit under 40%, never mind a low SOC for that.

We are severely into whether we are talking about what the battery can do or what it should do. Also whether you have enough charger and gen to do either!

Here's what Lifeline says about thermal runaway in their technical manual - my link three posts above understandably
indicates that Lifeline does not, and cannot, know all user problems that their customers have run into to - like with any
company:

6.4 Thermal Runaway

Thermal runaway is a condition in which the battery temperature increases rapidly resulting in
extreme overheating of the battery. Under rare conditions, the battery can melt, catch on fire, or
even explode. Thermal runaway can only occur if the battery is at high ambient temperature and/or
the charging voltage is set too high. As the battery accepts current, its internal temperature rises.
The rise in temperature reduces the battery impedance, causing it to accept more current. The
higher current further heats the battery, and so on, causing the battery temperature to "runaway".
An upper limit will eventually be reached when the electrolyte starts to boil, but once the electrolyte
has boiled away, the temperature can climb even further to the point of plastic meltdown and
possible fire.

As of this writing, Concorde does not know of any Lifeline® AGM batteries that have failed due to
thermal runaway. To preclude the possibility of thermal runway, the charging instructions in
Chapter 5 should be carefully followed, especially if the battery will be subjected to high
ambient temperatures.

Batteries should not be installed near heat sources or in direct
sunlight that may artificially elevate their temperature. Also, there should be adequate air
circulation around the batteries to prevent heat build-up.

You need to talk my batteries down then, because both want in excess of 100 amps at 14.4 initial.

Or am I using invisible ink? I've stated this several times on this thread.

Trojan AGM charging instructions want 20% rate, but also say that is the maximum. But then they say "recommended". Kind of wishy-washy.

Years ago a member on here reported his conversation with a Trojan tech who said there was no limit on initial charging amps in Bulk despite the Trojan 10% story for charging rate for (Foooded) longest life. That fits with the idea the battery will have an acceptance rate you cannot exceed. Just go lower SOC at the start of charging to use a higher rate.

https://www.trojanbattery.com/pdf/TrojanBattery_UsersGuide.pdf

Lifeline seems to be the only one who does not have a max charging rate. However, it is true of any battery that there is a maximum acceptance rate for a particular SOC at a particular voltage.

To use the high acceptance rate of Lifeline, you need to specify the charging voltage (14.4 has been stated) and what SOC. If 50% SOC limits the charging rate to about the same as the others', then what are we talking about?

So the real question is what DOD do Lifelines have to be so that you can use those amazingly high charging rates at 14.4v set on the charger? (Where you do have the high amps and enough gen to run the charger at those high amps)

MEXICOWANDERER wrote:
they do talk about and warn against a danger of thermal runaway with use of large charging currents ... even though they do also talk about how it's possible to use large xC charging currents.

Even though they clearly state they've never see it...hmmm-...

Firestone sold me a half dozen F100 tires in the sixties until I realized they were 1-ply and lasted 7,700 miles. Changed to Michelin and got 44,000 miles.

When a battery that costs 150% of another lasts three times as long, is that good :R

:h Hmmmm ....: https://mvdirona.com/2013/11/battery-thermal-runaway/

(The above link was the first on the list when I searched for Lifeline thermal runaway. But I should do a full disclosure ... some years ago I discovered Google's Advanced Search engine - and I have used that exclusively ever since.)

they do talk about and warn against a danger of thermal runaway with use of large charging currents ... even though they do also talk about how it's possible to use large xC charging currents.

Even though they clearly state they've never see it...hmmm-...

Firestone sold me a half dozen F100 tires in the sixties until I realized they were 1-ply and lasted 7,700 miles. Changed to Michelin and got 44,000 miles.

When a battery that costs 150% of another lasts three times as long, is that good :R