Correct - at least the part about the conductive material falling to the bottom and shorting the plates.
When I was a kid we rebuilt car batteries at the garage I worked at. Basically you take the top of the batter off, lift out the plates, scrub out the crud that was shorting them out. Then reassemble and add acid. That will often bring them back to new. If that didn't work, that batt went onto the scrap lead pile.
You can sort-of do that today.
- Take a lead-acid battery and drain it
- Fill with warm Coke Cola, 80F ideally and then cap it off
- Let it sit for about 36 to 48 hours in a warm place
- Every now and then, come by and shake it
- Drain the Coke out
- Fill with distilled or RO water. Shake it around.
- Drain. Repeat process till it is rinsed clear.
- Refill with sulfuric acid diluted with distilled/RO water to about 35% (1:3)
- Place on trickle charger or a good smart charger for the next 48hrs on the lowest amps.
This only works on lead-acid batteries that can hold a charge of 9VDC or better.
This will NOT work on AGM nor gel cell batteries. (RV/Marine)
You can use commercial sulfuric acid drain cleaner WITHOUT the enzymes. Just do the percentage calculations to get it close.
This will make a normal Group 24 or 36 battery fresh again for the next 6 to 8 years easily.
You know Coke can dissolve metal nails right, it's a great cleaner for battery scaled plates too.
There are at least 3 YT vids on this procedure as well. Been doing this on those maintenance free batteries since early 2000s. They have to have the caps that pop off with a flat blade screw driver.
NOTE: wear safety glasses and throw away gloves. PPE is a must for this.
Sulfuric acid works better than round-up, so dump it on weeds or on an old tree stump to get rid of. Coke is toxic and not natural, you can dump it down the sink.
This ZEP product is 100% SA. SKU ZUSADO32 at Lowes