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From: Kevin McMurtrie
Subject: Re: UPS - Sealed lead acid battery.
User-Agent: MT-NewsWatcher/3.2 (PPC Mac OS X)
Date: Sat, 05 Oct 2002 07:19:22 GMT
NNTP-Posting-Date: Sat, 05 Oct 2002 00:19:22 PDT
In article <firstname.lastname@example.org>,
email@example.com (HuweyII) wrote:
>I have three UPS's (APC Smart-600) which I'd like to continue to use
>each reports "replace battery"
>Anyway I've replaced the batteries in all three 6 - 12 months ago, and
>was fine for a while but all three have slowly started reporting
>"replace battery" again.
>So I figured maybe these three UPS's arn't charging the batteries,
>possibly they sat OK for a while but at some point the voltage dropped
>low enough for the UPS's to report a bad battery.
>I'm trying to figure out if I'm looking at a UPS that isn't charging
>or real bad batteries. (BTW, if I connect a small load, 150w or so,
>to the UPS and remove mains power it will turn it self off almost
>immediately due to low voltage)
>Each UPS has two 12v 6ah sealed lead acid batteries connected in
>I'm curious if what I'm seeing is about right for these unit's to be
>charging these batteries.
>My pair of test batteries sit at 23.94v with no load.
>When power is applied to the UPS's they give the batteries about
>27.45v at 140mA, however one of them gives about 310mA at about the
>Are these figured typical for these batteries?
>Also can anyone tell me what kind of resister I should use and what
>figures I should see to test a 12v 6 or 7ah sealed lead acid battery.
> -James Sutherland
27.45 is the right voltage but the current is very high. They should be
consuming more like 1 to 10mA when they're fully charged. Did you leave
the batteries discharged for a while? That makes them draw extra power
and dry out while recharging.
I just tested a 12V 7AH SLA and it settled to 5mA at 13.8V. It's a bit
warm in here so I imagine it's normally more like 2mA.
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