In article 42e35092$0$29458$5a62ac22@per-qv1-newsreader-
01.iinet.net.au, says...

Dear all

I am sure this has been posted before, but I cant recall the response.
I have several 12V gel cells out of UPS's which are dead.
Apparently they can be revived by desulfating them - any ideas on the
way to do this?

Sealed lead-acid (not all are "gel" types) can SOMEtimes be
revived. First and foremost: If the battery measures zero volts, don't
even try. Recycle it.

If it shows 10 or so volts, it may have developed a bad cell.
Revival can be attempted, but don't expect miracles.

The best possible method to revive any weak rechargeable battery
is with an electronic battery conditioner, such as those made by Cadex
or Christie. While very expensive if purchased 'new,' used ones often
show up on Greed-Bay, or at ham swap meets. Such a device will often use
a tightly-controlled 'pulse' charge/discharge method, which helps
destroy things like sulfiting without damaging the battery in question.

Happy hunting.


--
Dr. Anton T. Squeegee, Director, Dutch Surrealist Plumbing Institute.
(Known to some as Bruce Lane, ARS KC7GR,
kyrrin (a/t) bluefeathertech[d=o=t]calm -- www.bluefeathertech.com
"If Salvador Dali had owned a computer, would it have been equipped
with surreal ports?"