[time-nuts] 5370 processor boards available

Chuck Harris cfharris at erols.com
Thu Feb 27 16:26:19 EST 2014

I have worked on lots of equipment that was sealed with
a SLA inside, and I have never seen any sign of corrosion.
Only times I have seen a problem is in the case of UPS's that
were left discharged in unheated warehouses... the electrolyte
froze and the battery cases bulged greatly, but still no leakage.

-Chuck Harris

Dr. David Kirkby wrote:
> 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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