Hey man thanks for the video. I need to replace my original 15 year old BMW AGM battery, Never had an issue except I had some some rough starts lately and the radio stays on only for a minute then it turns off with the low battery symbol on the dash. Since new BMW battery is out of my price point, in your opinion, should I try this process or buy new budget replacement battery around 200$ How long do would you say the original recovered battery would last? Edit My battery voltage is at 12.33v
Wow 15 year? I can say you got pretty good run out of your battery!!! Don’t know if I would wanna mess with 15 year old battery but I guess you can try, you never know.
If you know the original weight of the battery that should help you decide how much water has evaporated and how much distilled water to add to each cell. e.g battery 120grams lighter, add 20ml to each of the 6 cells (120ml).
And I am watching this a week after I replaced my original battery with a Bosh AGM, which I hope to last even half of what the original one lasted (6 year).
The 3 year old AGM battery we hsve for our 2020 jeep( 2nd one for stop/start) Ours is only 220 cca. However our big battery ( for the main engine functions, you know starter and such) Is 750cca. Ours is a tiny small 12v battery, would this work for thsg to? @DIYDime
How do you know how much water to add? I've added about 50ml to each cell, but the top of the "plates" are still dry. I realize it's different with an AGM and they should not be fully flooded.
Try to charge now and after charging, test the battery. The goal is to get results, not to flood the cell. If no change in battery- repeat the process.
@@DIYDime Thanks for the input. It charges, but drops down to ~12.2 within a few hours once off the charger. A lot of heat was generated, so thinking I'll repeat.
@@bradanesi3998Make sure you charge the battery with low amps. If you have infrared meter you can check each sell to see if they perform same temperature. If one of them will give high temp then the other one it could be shorted.
Thank you so much for posting this! I've learned more about the construction of flat plate AGM and how to "potentially" bring them back to life. BTW, I have an AGM that's 2 years old. I left in a vehicle w/o starting for 10 months. My multimeter reads it as .53volts! Yup, that's right .53 volts. should I even bother DIYDime? Do you think you could do a video on potentially using an inverter welder like on a lead acid battery? Is this feasible?
Use a smart charger if you have. These chargers can adjust the charging profile according to the battery's condition and prevent overcharging. Set the charger to a low amp setting 2 amps. If the charger has a desulfation or reconditioning mode, use it. This can help break down lead sulfate crystals that may have formed on the battery. Connect the charger and start the charging process. Monitor the voltage and temperature. If the battery becomes hot or swollen, stop charging immediately. Charge the battery for 24-48 hours. A deeply discharged battery may require a long time to reach full charge. Periodically check the voltage. If the voltage rises steadily, it indicates the battery is accepting the charge. After charging, perform a load test using a battery tester. This will help determine if the battery can hold a charge and provide adequate power. Let the battery rest for a few hours after charging, then check the voltage again. It should hold around 12.6-12.8 volts if it's healthy.
Most AGM batteries I have seen like Optima batteries have no access to internals. Once they are dead even from leaving a dome light on they are gone! I have tried multiple tricks without success. I even used a voltage supply like yours at both low and higher voltages without any luck even hooking up a good battery doesn't work!
First thing to do is weigh your new battery or know what weight it should be. Over time you will see your battery get lighter. Regardless that they say AGMs are sealed, these batteries will vent moisture and more so if desulphated charged. I've seen some of my AGMs over time lose well over half a kilo in weight. I've added distilled water to bring them back up to original weight. You will find the sulphuric acid doesn't evaporate, it is mostly water you lose, so the electrolyte mixture should remain correct after adding the distilled water. You must allow time for the mats to rehydrate and then charge slowly. The extra water will also help with desulphated charging. So my experience is adding distilled water in the correct levels will improve the battery capacity and life but you'll never do anything to get a battery back to new levels. I've increased an old 100ah battery from 43Ah capacity back to low 80Ah's with this method. These have been measured with a RIGOL DL3021 Programmable DC Load.
you just saved me hundreds of $$$, ,good stuff
I have a 5 yr old agm battery and would like to know what all I need to charge and fix this
You need time to let water goes to into glass mats , and start charging after that.
Does this work on the long run? Any update after 6 months?
Yes it does, still using it.
Hey man thanks for the video. I need to replace my original 15 year old BMW AGM battery,
Never had an issue except I had some some rough starts lately and the radio stays on only for a minute then it turns off with the low battery symbol on the dash.
Since new BMW battery is out of my price point, in your opinion, should I try this process or buy new budget replacement battery around 200$
How long do would you say the original recovered battery would last?
Edit
My battery voltage is at 12.33v
Wow 15 year? I can say you got pretty good run out of your battery!!! Don’t know if I would wanna mess with 15 year old battery but I guess you can try, you never know.
did you charge it at 13.7v 2amps on the first charge or was that for the second charge?
First 13.7
@ and was the second charge 13.7 or 14.7?
That is correct
Hi DIYDIME, I have a bmw motorcycle agm battery (12V 8Ah 120 A) how many Amps should I slow charge it and how much Water do I need to ad to the cells?
2 Amps, do not flood cells, only little bit each cell
If you know the original weight of the battery that should help you decide how much water has evaporated and how much distilled water to add to each cell. e.g battery 120grams lighter, add 20ml to each of the 6 cells (120ml).
And I am watching this a week after I replaced my original battery with a Bosh AGM, which I hope to last even half of what the original one lasted (6 year).
how low did you discharge it to ?
11,.5 Volts and I did cycle twice.
Hi where did you buy the power supply ?
DC Power Supply Variable, 30V 10A... www.amazon.com/dp/B0B7WBDXWN?ref=ppx_pop_mob_ap_share
Thank you so much
The 3 year old AGM battery we hsve for our 2020 jeep( 2nd one for stop/start)
Ours is only 220 cca. However our big battery ( for the main engine functions, you know starter and such)
Is 750cca.
Ours is a tiny small 12v battery, would this work for thsg to?
@DIYDime
How do you know how much water to add? I've added about 50ml to each cell, but the top of the "plates" are still dry. I realize it's different with an AGM and they should not be fully flooded.
Try to charge now and after charging, test the battery. The goal is to get results, not to flood the cell. If no change in battery- repeat the process.
@@DIYDime Thanks for the input. It charges, but drops down to ~12.2 within a few hours once off the charger. A lot of heat was generated, so thinking I'll repeat.
@@bradanesi3998Make sure you charge the battery with low amps. If you have infrared meter you can check each sell to see if they perform same temperature. If one of them will give high temp then the other one it could be shorted.
@@DIYDimehigh voltage and low amps?
@@DIYDimealso you only
Charged it and discharged it once?
Thank you so much for posting this! I've learned more about the construction of flat plate AGM and how to "potentially" bring them back to life. BTW, I have an AGM that's 2 years old. I left in a vehicle w/o starting for 10 months. My multimeter reads it as .53volts! Yup, that's right .53 volts. should I even bother DIYDime? Do you think you could do a video on potentially using an inverter welder like on a lead acid battery? Is this feasible?
Use a smart charger if you have. These chargers can adjust the charging profile according to the battery's condition and prevent overcharging.
Set the charger to a low amp setting 2 amps.
If the charger has a desulfation or reconditioning mode, use it. This can help break down lead sulfate crystals that may have formed on the battery.
Connect the charger and start the charging process. Monitor the voltage and temperature. If the battery becomes hot or swollen, stop charging immediately.
Charge the battery for 24-48 hours. A deeply discharged battery may require a long time to reach full charge.
Periodically check the voltage. If the voltage rises steadily, it indicates the battery is accepting the charge.
After charging, perform a load test using a battery tester. This will help determine if the battery can hold a charge and provide adequate power.
Let the battery rest for a few hours after charging, then check the voltage again. It should hold around 12.6-12.8 volts if it's healthy.
did it start?
😂Yes it did! Working like new
@@DIYDimehow many water u add? Zuur or not?
@@jethrobenjiro in my case it was only full syringe for each cell
Most AGM batteries I have seen like Optima batteries have no access to internals. Once they are dead even from leaving a dome light on they are gone! I have tried multiple tricks without success. I even used a voltage supply like yours at both low and higher voltages without any luck even hooking up a good battery doesn't work!
You need to connect another good battery parallelly when charging the agm.
Лузер😂
there you go people just add water to your bad battery and it will be like new.
First thing to do is weigh your new battery or know what weight it should be. Over time you will see your battery get lighter. Regardless that they say AGMs are sealed, these batteries will vent moisture and more so if desulphated charged. I've seen some of my AGMs over time lose well over half a kilo in weight.
I've added distilled water to bring them back up to original weight. You will find the sulphuric acid doesn't evaporate, it is mostly water you lose, so the electrolyte mixture should remain correct after adding the distilled water. You must allow time for the mats to rehydrate and then charge slowly. The extra water will also help with desulphated charging.
So my experience is adding distilled water in the correct levels will improve the battery capacity and life but you'll never do anything to get a battery back to new levels. I've increased an old 100ah battery from 43Ah capacity back to low 80Ah's with this method. These have been measured with a RIGOL DL3021 Programmable DC Load.