Ran an AGM battery dead, is it ruined?

[ProchargedCamry]

I drive a 2006 Camry 2.4L. I have a year-old 24F Everstart Platinum AGM battery. I left the hazards on and killed the battery. Jumped it fine with a Noco, battery seems to be okay now. Took a couple of start-stop cycles to charge to typical voltage levels I was accustomed to.
Did I severely hurt the AGM battery? I was hoping to get maybe 7-8 years out of this battery.

 

[UncleDave]

It's probably not completely crashed but every flattening reduces life.

Any idea what voltage dropped to?
What exact charger did you put it on?
By determining the chargers min startup voltage (if it's solid state it will have one) is we can determine just how flat it was.
Most modern ones will initiate charging at 1-3V.

If you used an old school charger it would start at 0V

 

[JavierH19]

Likely not if it wasn't left dead. It's being left at a low voltage that ruins them but so does constantly deep cycling a non deep cycle rated battery but just once it's not an issue.

 

[crashz]

I would have put it on a slow charge to bring it back up, but it is probably serviceable. Did it sap some life out of it? Maybe. I've had a couple of Optima's last a few discharges, but saw definite performance issues.

 

[Cujet]

Just an FYI, if one depletes an AGM, the can be restored by a constant current charge. No need for a fancy charger.

Simply set the CC charger at 1/10th the 1 hour AH rate and charge for 16 hours. Take a break at 8 hours if it gets hot. Let the voltage go to any level it finds.

Example, a 20AH battery, constant current charge a 2.0A for 16 hours, from a starting point 10V or below.

This can also restore an older, still functional AGM. Just make sure to slowly draw it below 10V first.

https://a.co/d/iSVkrzD

 

[ripcord]

If you can, it would be a good idea to put it in a trickle charger to make sure it is fully charged. Batteries don't like to be partially discharged.

 

[ripcord]

Just an FYI, if one depletes an AGM, the can be restored by a constant current charge. No need for a fancy charger.

Simply set the CC charger at 1/10th the 1 hour AH rate and charge for 16 hours. Take a break at 8 hours if it gets hot. Let the voltage go to any level it finds.

Example, a 20AH battery, constant current charge a 2.0A for 16 hours, from a starting point 10V or below.

This can also restore an older, still functional AGM. Just make sure to slowly draw it below 10V first.

Preferably outside... and just to clarify what Cujet is saying, this is for a dead a and weak AGM battery. On a relatively new one, this would be harsh treatment.

 

[Astro_Guy]

No need for a fancy pulse charger, they don't work anyway.

Why do you say that? I have had the https://www.harborfreight.com/4-amp...ntrolled-battery-chargermaintainer-63350.html going on four years and it seems to be very good at reviving deeply discharged batteries. I've used it on an AGM battery in my generator, a U1 battery in my lawn tractor and most recently on the MIL's 2012 Honda CRV that hadn't been driven since April. It seems to work well for me...

 

[Escape08]

No worries. Use it until it dies, 4 year warranty backs it up.

 

[Brian123]

I drive a 2006 Camry 2.4L. I have a year-old 24F Everstart Platinum AGM battery. I left the hazards on and killed the battery. Jumped it fine with a Noco, battery seems to be okay now. Took a couple of start-stop cycles to charge to typical voltage levels I was accustomed to.
Did I severely hurt the AGM battery? I was hoping to get maybe 7-8 years out of this battery.

I have a question, or a few questions, why were the Hazards put on? If you put them on, and you knew how to put them on, why did you not shut them off? I once left the lights on my car, and they shut off, the newer car did, the older car did not. I have no clue on how to turn the Hazards on my car, I know I will get some responses, LOL.

 

[meep]

Supposedly AGMs can handle incidents like this a little better than FLA. also, the general rule of thumb is that a deep, full-to-zero discharge thats not immediately recovered can result in 20% loss of capacity. In my experience, they need to sit flat like that for more than just an overnight to be that harsh. In your case if damage was done I’d expect it to be much less than 20%. Maybe 5%. Maybe less. I had one particular battery that could crank the v8 for maybe 25 seconds total. It was a hope and a prayer that it could start within 20 seconds. There were plenty of morning starts for 2 years where the 25 seconds wasnt enough, and the battery tapped out, and a jump was needed. It saw “dead” a lot. We used it like this for several years.

I had a beloved 97 Subaru that saw its dome light left on a number of times to zero. I have no idea how many times. Battery was 6 years old and still reliable when I replaced it out of caution.

 

[Mainia]

I drive a 2006 Camry 2.4L. I have a year-old 24F Everstart Platinum AGM battery. I left the hazards on and killed the battery. Jumped it fine with a Noco, battery seems to be okay now. Took a couple of start-stop cycles to charge to typical voltage levels I was accustomed to.
Did I severely hurt the AGM battery? I was hoping to get maybe 7-8 years out of this battery.

I learned at a young age, NEVER NEVER leave flashers on unless you are in the car or around the car. Turn them off when you leave the car on side of the road. As an AGM owner, you will most likely not get more then 4 years out of it. You got the exact outcome that I had twice. After the second fried battery I never again left my car with flashers on.

 

[Cujet]

Preferably outside... and just to clarify what Cujet is saying, this is for a dead a and weak AGM battery. On a relatively new one, this would be harsh treatment.

It is the appropriate way to restore a new, but fully depleted AGM. The charge rate is very modest. It is 1/10th the 1 hour AH rate. Not the 20 hour rate. To convert, simply multiply the 20 hour rate by 0.8.

 

[k1xv]

Don't worry, be happy.