On Tue, 22 Aug 2017 20:07:11 GMT, alister wrote:

> Any sensible user of these devices should be replacing the batteries @
> the recommended intervals which would be long before they ware stating
> to show signs of failing.

I don't think my APC unit has a recommended interval. Instead it has
an automatic "test" mode that lights a "replace battery" light. IMHO
this test mode is another contributory factor to short battery life
in APC UPS's. It doesn't perform a decent cycle.

Routine replacement is OK for a situation that absolutely requires
power but not particulary economic for many other cases.

> you don't want for find out your UPS batteries are shot when you have
> that power outage & loose critical data

So why cook the batteries thus shortening their useful life? Two
things spring to mind: High charge rate to reduce the time required
to after the UPS has shutdown due to low battery, restoration of
mains power and the UPS restarting. Fair enough but why have a fixed
charge rate? It's not exactly difficult to switch from a high rate to
a float rate. Or APC just want to increase the sales of their rather
expensive "battery packs".

--
Cheers
Dave.

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