[time-nuts] 5370 processor boards available

[Dr. David Kirkby]

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