"Andrew Rossmann" wrote in message
...
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
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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Next time you buy a spare battery to save for later, buy a dry-charged
battery with the acid in a separate bottle/applicator.

The Varta motorcycle battery I bought before the UK VAT increase came with a
DIY filling kit so I could store it till I need it, with a bit of shopping
around you should be able to find a DIY filling kit SLA.