There are some other failure modes for gel cell (and other lead acid types)
batteries.
One is a shorted cell caused be the plates warping and breaching the
separator insulation. This is not recoverable.
Another more likely failure is corrosion of the connections to the plates.
Also not recoverable.
If the battery is more than five years old it is most likely time to trade
it in for a new one.
Regards,
Tom
----- Original Message -----
From: "Charles Steinmetz" <[email protected]>
To: "Discussion of precise time and frequency measurement"
<[email protected]>
Sent: Sunday, July 27, 2014 3:41 PM
Subject: Re: [time-nuts] OT Gel Cell question
Robert wrote:
Anyone know why Gel Cell batteries go HI-Z if discharged below a certain
level?
Also is there a way to rejuvenate a "dead" one?
As others have explained, the problem is sulfation. I have had good
results de-sulfating lead-acid batteries of all types (flooded, gel, AGM)
with "BatteryMINDer" brand chargers/desulfators. With badly sulfated
batteries, rejuvination can take a long time. Often, they return to a
good approximation of "like new" performance. Sometimes they improve but
don't return to "like new."
<http://www.batteryminders.com/batteryminder-model-1500-12volt-1-5-amp-maintenance-charger-desulfator/>
Best regards,
Charles
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