Best to stick with the cheaper and safer SLB.  Charging circuitry can
fail, and it is not uncommon.  When it fails, it shall take down the
power IGBTs, big capacitors, many banks of batteries all at one go.
We have just savaged a APC UPS that took down 240pcs of 7AH SLB, and
the other 240SLB (almost 10 years old) can be savaged through
reconditioning to 70-80% of its capacity.

And many times, the under-staffed and under-trained operation leave
the UPS connected during electrical "earthing" test which happen rare
enough for people to forget to unplug their equipment from the main.

Cheers, Ling SM

> I have a very old (but working) 1200VA APC UPS which requires two new
> 12V lead-acid batteries in series. I want to try and install a different
> type of battery chemistry that would yield a much longer service life
> than the ~3 years generally specified for sealed lead-acid UPS batteries.
--=20
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