>    The problem here is that my UPS tends to slightly overcharge the
 > battery, shortening the life considerably.
Mine need water every few months, and it's all too easy to forget to check 
them. I put an equalizing charge to them just a couple of days ago, and my 
chart on the wall says that 08/01 was the last time I did so. One set took 
quite a lot of water, too.
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