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Re: Just replaced Flooded battery with AGM, was that a mistake? [Re: jayjr1105] #5283681 12/03/19 07:35 AM
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Extremes, specific benefits and application needs are to be assessed before pulling the trigger on an AGM purchase.

Re: Just replaced Flooded battery with AGM, was that a mistake? [Re: jayjr1105] #5283863 12/03/19 10:50 AM
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Pennsylvania so no extreme heat other than a few days in July and A few days in January in single digits. On the other hand, can someone decode the manufacture date from this battery. I took several pics...

https://imgur.com/a/ovJIFwQ


2013 Mazda 3 - PP 0w20
2005 Honda Odyssey - PP HM 5w20
Re: Just replaced Flooded battery with AGM, was that a mistake? [Re: jayjr1105] #5283925 12/03/19 11:49 AM
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Originally Posted by jayjr1105
Pennsylvania so no extreme heat other than a few days in July and A few days in January in single digits. On the other hand, can someone decode the manufacture date from this battery. I took several pics...

https://imgur.com/a/ovJIFwQ


October 2019





Re: Just replaced Flooded battery with AGM, was that a mistake? [Re: jayjr1105] #5284028 12/03/19 02:07 PM
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NO

Re: Just replaced Flooded battery with AGM, was that a mistake? [Re: PowerSurge] #5284362 12/03/19 07:16 PM
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Originally Posted by PowerSurge
https://www.consumerreports.org/car...ts-your-car-battery-what-to-do-about-it/

“But even AGM batteries face challenges. “AGM batteries will perform well in the heat, but the life span will be hampered due to loss of water from the high temperatures,”

FLA’s last longer in hot climates.


This makes zero sense unless they are essentially abusively charged.

AGMs, which are also valve regulated lead acid batteries, are designed to fully recombine the formed hydrogen and oxygen inside. The “valve” prevents escape.

They can overpressurize on charging and lose gas. Recall that coulombs and amperes relay numbers of electrons. Electrochemical reactions are reliant upon mass - quantity of reactant to create those numbers of electrons in the circuit. If charged too fast, ie too many amperes, the overpotential (voltage) must be higher. This gives a one-two punch. Higher voltage which drives the electrolysis reaction, and more current which means more electrolysis can happen. Too much happening (faster splitting than recombination) will create pressure. Simple concept. Then the burped has, which should have recombined to water, is lost forever, impossible to add back.

So it is possible. But I’d suspect it needs to be a very fast charge on a very high impedance battery. In normal use, they should not lose appreciable water.

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