On Jan 2, 11:01*am, Andrew Rossmann
wrote:
I have a battery I bought for an APC UPS about 4 years ago. I bought 2,
and used one immediately. I kept the other on the side as I have several
The UPS batteries are lead acid jell types. This type of battery if
discharged for any length of time will become sulfide damaged.

Under normal use these lead acid jell batteries have a usable lifespan
of about 3 to 4 years. Sometimes I only got about 2 to 3 years out of
the batteries.

Here in our facility we have many UPS's. I keep logs on their
maintenance. I am changing the batteries on an average of about 3
years. If l leave a UPS discharged for more than about a week, I have
to replace the battery. I found they become damaged very fast.

When the UPS is powered off and the battery is left connected inside
it can hold the charge for maybe a week or two. If I disconnect the
battery it will hold enough charge for about a month or maybe two.


Jerry G.


UPS's that use basically the same battery. Of course, over time, it has
discharged itself. I measured about 4.3V instead of the normal 12-13V. I
put it in a spare UPS, which immedialy complains if I try to turn it on.
Luckily, the UPS charges even when it is off, but slowly. I measured
about 15mA initially, and after about 36 hours, about 7.5mA. It is
currently up to about 10.7V.

How much damage do you think was done to the battery? I know it will
lose some capacity.

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