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Old 12-13-2020, 05:35 PM #1
Guru6022 Guru6022 is offline
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Did I just ruin my new agm battery

So a few months back I bought an a battery for my 4runner and it has been working great. Its winter now so it's been sitting outsidefor about a month and has been cold down to 10f at night. I go to unlock it and and nothing. I manually open the door put the key in and zero lights come on! I jump start the car move it and now the battery is on a battery tender. Have I damaged its charging potential? Have I caused some kind of permanent damage? I have a winch hooked up to it nothing else. This ruins my day a bit.
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Old 12-14-2020, 04:00 PM #2
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Someone may be more knowledgable on these than I, but anecdotally, I have run down my AGM batteries over the years, to no dash lights or clicking, and jump started them and they were fine.
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Old 12-21-2020, 01:07 AM #3
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have to use a multi meter to determine the voltage of the battery first, if its below 12, use a charger to wake it up, then itll charge it back up to the proper voltage. charger with agm mode will try to charge at 14.3 to 14.7v, depending on the charger, itll bring the battery back to full if it holds charge.
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Old 01-11-2021, 01:25 PM #4
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Disclaimer first, I am not an expert when it comes to batteries. That being said, I have recently purchased an AGM battery for my starter battery and am looking at purchasing a deep cycle hybrid for my dual battery set up. Charging AGM batteries can be tricky in cars that weren't designed to charge them. AGM batteries require a higher charging voltage and different charging profile than your standard lead acid battery. Since your battery is somewhat new I would make sure to have your battery tested to see if there isn't a draw on it when the vehicle is turned off. If you do decide to get a battery tender/charger make sure it is compatible with AGM batteries to get the proper charging voltage and charging profile. My two cents.
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Old 01-11-2021, 01:53 PM #5
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You really need a muitimeter / volt meter. Take a reading of the battery (before recovery charging) to determine the voltage of the battery when it was dead.

That would have given you a much better indication of how far it was pushed into the ground.

The low voltage is one thing, but the longer the duration is actually a bigger concern.

At this stage all you can do it charge it and monitor it to see how it does. You can always get it tested to CCA as well.

Edit:
I feel good lead batteries can be resilient, and can handle a couple deep discharges without too much degradation. If I suspect a battery is low I always measure it first and decide what to do. If it is dangerously low, I never crank the engine and put a load on the battery; I have actually internally shorted a battery doing this making it unusable. I have also recovered batteries from very deep discharge with minimal issues, and they go back into service like normal.


Last edited by Bumbo; 01-11-2021 at 02:04 PM.
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Old 01-11-2021, 02:49 PM #6
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Check out my thoughts on this after my first picture in my post here. I can't say for sure if it's better or worse at this point, but no issues to report after about 2 and half months of running it like this.
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Old 01-11-2021, 06:37 PM #7
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I did the same thing - I just hooked up a battery tender and let it charge for 24 hours. Battery has been fine since.
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