[time-nuts] 5370 processor boards available
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.
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.
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