[time-nuts] 5370 processor boards available
Dr. David Kirkby
drkirkby at gmail.com
Thu Feb 27 18:14:40 UTC 2014
On 27 February 2014 17:31, Chuck Harris <cfharris at erols.com> wrote:
> Backup batteries don't make me queasy. The easiest,
> cheapest backup battery would be a small 6V 3AH sealed
> lead acid battery. It is trivial to make a good float
> charger using a 3 terminal regulator and a diode, and
> they do not leak, vent, or anything problematic. The
> little 6V 3AH packs are used in emergency lighting, so
> they are readily available. Float them at 6.9V, and
> they will last at least 5 years.
I thought there was an issue with even "sealed" lead acids of them
emitting small amounts of sulfuric acid, which is not great in a bit
of test equipment.
Dave
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