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Date: 09/08/00 at 11:48 AM
Posted by: Eero Heikkinen
E-mail: eero.heikkinen@kolumbus.fi

I´m designing an embedded computer system that has to be backed up against power breaks, so I'm building yet another UPS.
This is an Pentium board, consuming some 10 - 15 W, and the requrement is to keep it runnning for at least a few minutes on a battery in case of power loss.
Even worse, the operating temperature range is -25C to +55C.
Selecting the right battery type bothers me:
1) Dry lead acid battery would work (think so), but it's heavy and not environmentally too "green"
2) NiCd is out of question - it won't survive in this kind of stand by application, without regular charge / discharge cucling.
3) NiMH - does anyone know how it will perform in standby ?
4) Lithium Ion is diffucult and somewhat risky, but these problems one may overcome. But does it work in low temperatures, and how does it survive in standby app ?

Thanks for any comments and succestions.

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