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Daox 10-10-2013 11:15 AM

Fixing a reversed cell in a lead acid 12V battery
 
Last night I found one of my lawn mower batteries (group 31, 12V) at 8.8V after a fresh charge. So, I know I reversed a cell or two in it. I'm looking to fix it as its not that old. A quick google says to discharge the battery FULLY and then recharge at a low amperage.

I'm wondering if anyone knows anything about fixing those reversed cells? Have you ever tried it?

P-hack 10-10-2013 12:22 PM

hmm, I've never heard of "reversed cells" except as a temporary thing, and then how DO you discharge it completely?

A ----|-2v+|----|+2v-|---- B
A conductor from A to B won't conduct.

Are you able to volt probe from plate to plate, gently, through the water ports?

Daox 10-10-2013 03:13 PM

I'm not sure, I might be able to. We shall see. :)

redpoint5 10-10-2013 09:40 PM

I saw a clip on youtube that demonstrates a lead acid battery being mostly restored by adding Epsom salt to each cell. I'm not sure how this works, or why everyone doesn't do this when their battery falls low on voltage or CCA.

http://www.youtube.com/watch?v=vqfaziZE1XM

Ryland 10-11-2013 02:01 AM

is it a flooded battery? if so, make sure all the cells are full up to the top of the plates at least and put it on a charger, I would start out with a 2amp charger and let it sit for a few days to see what it does, I think draining it down to dead is how it got this way, so that will just make it worse!


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