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Michael A. Terrell

Andrew Rossmann wrote:

In article ,
says...

I have been following this thread for awhile. Many have talked
about sulfated cells and you initially said the charging current
was less than 10 mA. Given the low battery terminal voltage, I
doubt the problem is a sulfated battery since sulfation leads to
a high impedance battery and high terminal voltage while
charging. I would suspect a problem with the charging circuitry
in the 'spare' UPS you are using for charging. The current should
be closer to 1A until the voltage rises some more. At ~13.6 volts
the current should drop off markedly.

I put the ES 350's own battery back, also somewhat depleted after
sitting awhile. It's a slightly smaller 3.2AH version. After sitting
overnight, I was able to get it the UPS to stay in ON mode if I
unplugged the UPS from power, then plugged it back in. I roughly
measured nearly 100mA of charge. I tried swapping the other battery, and
it was back to 5mA. I'm considering that battery toast.

The battery in the one UPS that lasted only 5 minutes has been drained
once or twice before, so has lost capacity from that. I'll get a pair of
batteries to replace both of the ES 725's I have, as both are nearly the
same age.

Now to figure out where to safely recycle these. I have a pair of old
12AH's from another UPS that have been sitting around in addition to the
ones I'll be replacing.

Most places that recycle car batteries will take them. Here in
Central Florida I can drop them off at any of the transfer stations. If
they say they can't take them, tell them they are built like car
batteries, but smaller. Or tell them it was on your motorcycle. ;-)

--
For the last time: I am not a mad scientist, I'm just a very ticked off
scientist!!!