Dead battery

[Lena]

My Kubota’s only a couple/few years old and already a dead battery, by chance my ranger battery is on it’s last leg, my riding lawnmower battery is kaput and I have a stack of other dead batteries.
This guy

claims that this charger will fix any and all dead and depleted batteries and he has over 6000 comments supporting his statement.
( didn’t read all 6000 but didn’t see anything contradictory)
Charger is over 300 bucks…….. I don’t believe that 6000 viewers of his video has a 300 plus dollar charger so what do you guys think?

saw an article once where a guy said he used a welder to revive a dead battery. you can try all kinds of things . I once had a battery blow up while jump starting a tractor. acid everywhere. i play it safe now. Dead battery that won't charge with a chargerGets replaced.

 

[DieselBound]

Remember, one can get a battery to read 12v(+) but that don't mean it's good. The real test is a load test. Have run across batteries that would have good voltage but no "strength" (amps) for starting equipment.

 

[Little Red Tractor]

I was taught to NEVER add acid to a battery once the initial filling was completed. Probably the danger from hydrogen gas is the reason--a very good reason. Batteries are expensive, but a new shop and a stay in the hospital are "expensiver."

 

[Too many Kubotas]

I’m trying it now, turns out I had a charger with the 200 amp setting.
Buried and didn’t know I had it.

Anyway I’d rather do it a few more times at 40 amp and not burn up anything if at all possible.

From what I understand, after having read it and from experience, is that a low charge (1-2 A) over a longer period is the best way to try to recover a "dead" battery. Once/if the battery shows signs of taking a charge the amps can be upped.

With smart chargers/maintainers it's often possible to trick them into working by connecting a good battery to the "dead" one for maybe half an hour, or until the smart charger will recognize the "dead" one.

Either way, quality maintainers definitely help batteries live, as do good solar chargers, and anything with desulfation really helps.

Having about 80 batteries to tend to, I have learned a bit about what works and what doesn't. A disconnect on the negative side, for example, does help.

 

[Williy]

I purchased this from wally world and it lets me know if
my battery is good or need a shovel:

willy

 

[newbury]

To me and dead battery is a dead battery, IF is does not come back to life in a 12 hour charge from old school 6 amp charger, it really dead....

Didn't see it emphasized -
I've read that most of the recent chargers sold are "smart" chargers. They require some minimum charge.
If a battery WON'T kick off a modern charger (usually has "smart" features I try my old (pre2000) Schumacher, that sometimes gets a little juice into it and it then will take a charge. But the battery is on it's last legs at that point.