Lead acid battery reconditioning question

Submitted ⁨⁨1⁩ ⁨week⁩ ago⁩ by ⁨thinkercharmercoderfarmer@slrpnk.net⁩ to ⁨fixing@slrpnk.net⁩

I have recently accidentally come into possession of a bunch of old lead acid batteries, ranging from a few months to several years without charging or maintenance. I could just get rid of them, but I would like to recondition and reuse them as additional power storage for my solar array, if possible. I have been looking at desulfator chargers online and I am planning on getting one and hooking it up to the batteries and just seeing what happens.

Does anyone have any experience reconditioning old lead acid batteries? Are there pitfalls I should be aware of? Since they are of unknown condition, am I better off scrapping them and buying new?

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perestroika@slrpnk.net ⁨1⁩ ⁨week⁩ ago
Some tips: listen for bubbling. If a battery makes bubbling sound, that means it produces hydrogen. That’s not supposed to happen outside a short period at the very end of charging.

If it happens early, there could be one or several dead cells, causing other cells to experience overcharging. If it doesn’t hold a voltage of 2V per cell (6 cells = 12 volts), discontinue using, as a dead cell is then very likely present in the battery.

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- thinkercharmercoderfarmer@slrpnk.net ⁨1⁩ ⁨week⁩ ago
  good note, I’ll keep a lookout for that.
  
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violentfart@lemmy.world ⁨1⁩ ⁨week⁩ ago
A “battery tender” or similar can sometimes help batteries that aren’t too far gone. And check water levels like the other comment mentioned.

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- thinkercharmercoderfarmer@slrpnk.net ⁨1⁩ ⁨week⁩ ago
  I’ll read up on those. I want to have a trickle charger attached to my main power anyway for the known-good batteries in my array to keep them from discharging too far in low production times, so if they hold a charge they’ll probably live on one permanently
  
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vatlark@lemmy.world ⁨1⁩ ⁨week⁩ ago
If the batteries have a cap on top that you can open with just your fingers, you should open it and make sure the lead is submerged in the liquid.

If not, add DI water to cover them.

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- thinkercharmercoderfarmer@slrpnk.net ⁨1⁩ ⁨week⁩ ago
  A few of them are sealed, some have pop tops. The few I have opened are completely dry. My plan for the ones with removable caps I’m planning to fill with distilled water and test, then try to recondition them with a desulfator and see if I can detect any difference. never reconditioned batteries before so it’s going to be a learning process. Not sure what, if anything, I can do with the sealed ones, I’m focusing on the ones with caps first.
  
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