More on Batteries
Zscoundrel
zscoundrel at kc.rr.com
Tue May 13 18:04:04 CDT 2003
Pretty good info, but the 'memory' issue in ni-cads is actually just a
build up of hydrogen gas on the surface of the electrodes. If you can
get the electrolyte to re-absorb the gas the battery will work better.
This is how the 'reformer' chargers work.
Jonathan Hutchins wrote:
>
>Nickel-cadmium batteries were originally developed for use in jet aircraft,
>whose engines require significantly more power to start than internal
>combustion engines. Ni-Cad's can provide more current than lead-acids, but
>have some quirks. The old liquid-electrolyte Ni-Cads did have "memory"
>problems of not being able to deliver a full charge if they had only been
>lightly discharged repeatedly. A regular maintenance procedure was to
>completely drain the battery by using shorting plates connecting the terminals
>of each internal cell. This restored the ability to deliver full capacity.
>
>The modern Ni-Cads we use in electronics are a far remove from these old open-
>container things, and studies have shown that capacity lost to "memory" is
>insignificant. Still, high-tech chargers for Ni-Cads and other modern
>batteries often do a "conditioning" cycle, fully discharging the battery and
>recharging it in a carefully calculated pattern to give the battery new life.
>
>So your best bet for a UPS is a good car battery, keep it clean and charged,
>don't deep cycle it if you don't have to.
>
>---------------------------------------------------
>This mail sent through tarcanfel's horde/imp system
>
>
>
>
>
More information about the Kclug
mailing list