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Old September 13th 05, 05:31 AM
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Ryan Underwood wrote:
> Here's a short quiz.


> The question I'm really getting at is whether or not "sealed" batteries ever
> run low on electrolyte like "capped" batteries do. If they do, it seems like
> the battery would have an artificially short lifetime if it is not possible to
> add fluid as necessary.


They lose much less water, maybe 80% less and should never run dry
unless very old or badly overcharged (shorted alternator regulator)
because the plates are submerged deeper and are made of a different
alloy, lead-calcium, that consumes much less water than the
lead-antimony found in low-maintenance batteries. But lead-calcium
batteries are much less resistant to accidental deep discharge and may
be ruined if the headlights are forgotten just once overnight, compared
to 3-10 times for other batteries. There are maintenance-free
batteries with removable caps, made by Exide and possibly Johnson
Controls' Eveready brand (but not their others).

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