Rejuvenate a "dead" battery

[Wallythacker]

There's a lot of info out there about what constitutes a dead battery, can they be brought back to life, will they last and so on.

A few years back I bought a device to desulphate lead acid, likely gel cells and AGM styles will respond too. It was cheap, I think $19 or so at the time.

https://www.amazon.ca/Orange-Battery...08&sr=8-5&th=1

I used it a couple of times and didn't see any improvement. So I parked it in a corner of my toolbox. Fast forward to last week or so. I "rediscovered" it and thought what can it hurt? I have two powersport batteries, both for my 400 Suzuki Burgmans. One is AGM tech, the other doesn't state but it's likely just a cheap SLA. Both are 130 CCA AFAIK.

Neither battery held a charge for any length of time. Perhaps a week-1o days at best at 70F. After several cycles using the gadget both batteries responded nicely. The AGM, many years of age, maybe 8 years old? I forget, went from 78 CCA with overall health of 55% to 115 CCA and overall health to 81% It would not charge higher than 12.9v before to 13.6v now. It also seems to hold the charge.

The SLA wasn't as major a jump but it's, IIRC, close to 11 years old. It went from 122 CCA to 130 CCA and overall SOH from 68% to 78% It also now charges to 13.6v from just under 12v.

The biggest improvement, it's still being worked on, is a deep cycle RV/Marine battery. It's gone from 0.2v to 9.6v , CCA from 5! to 165, SOH, I forget the start value but it's now @ 15% I suspect it's going to need a lot of cycles but it's only costing me time so far and this battery cost well over $250 when new and it only saw 2-3 years of service before my Dad died and it was an orphan among his stuff.

I was a bit skeptical when I started but the concept was solid enough, it's been proven in other fields I just wasn't sure how well a $20 unit could do the job.