[Shop-talk] Resurecting a totaly dead battery ?

[Jeff Scarbrough]

This reminds me of an older mechanic I worked with...His solution for
batteries, in the days when you could take the caps off, was to short the
terminals with a big heavy chunk of metal.  When it was fully discharged,
he'd turn it upside down and rinse all the sediment out of the cells.  Then
fill it with distilled water, and charge it back up.  I'm an engineer, not
a chemist, so I don't understand exactly how this works, but I saw it work
at least once to extend the life of a "dead" battery.

On Sun, Jun 21, 2020 at 3:32 PM Jack Brooks <jibrooks at live.com> wrote:

> Yes  a battery tender or battery minder would be you best bet.  Leave it
> on there for at least a week.  You may need to boost it with a charger if
> it won't get started for to lie voltage, but that is your best bet for
> saving the battery
>
> I use a BatteryMinder, likely the same basic circuitry as the tender,.  I
> have brought back some really weak batteries, some that would barely crank
> the engine over by leaving them on that "pulse" cycle for a week or more
> and now they work great even in the cold winter months.  What they claim it
> does, is break down the sulfate growth between cells, which is what
> eventually kills the battery.
>
> I usually put every battery in the garage on it for a day or two a year as
> a precaution.  The dying batteries are still running strong.
>
> Jack
>
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