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 <cfhar...@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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