If a gel-cell battery, or any sealed battery, gets overcharged for
long enough it will lose electrolyte, and there's nothing a charger
can do about that.
Wouldn't a UPS battery be unlikely to get sulphated, since it is kept
fully charged (or over-charged) all the time?
It might be a interesting experiment to accurately weight a sealed
battery when it is new, and see how much less it weighs once it is
shot.
Doug
On Tue, Feb 14, 2012 at 10:12 AM, Jimmie Mayfield
<mayfield+shoptalk@sackheads.org> wrote:
> I've had less than stellar success with my 2/4/8amp BatteryMinder. It seems
to
> work okay as a normal over-the-weekend charger but I haven't had much
success
> recovering 3 AGM batteries that my APC UPSes had declared 'dead'. None of
the
> batteries weren't so far gone as to cause the BM to reject them outright
but
> they had no capacity under load. BM didn't recover any of them to the
point
> of being useful again in a UPS. Left one of the batteries connected to the
> BM for six weeks but no dice.
>
> Maybe my expectations were too high or maybe desulfation cycle works only
> when used regularly or maybe it takes several months to recover a badly
> sulfated battery?
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