Our server room at this site is pretty small, so we have only 9 UPSs for battery backup of important servers and equipment. Most are 700 to 1000 VA APC brand UPSs. It seems as if we are constantly changing the batteries for our UPSs. Apparently the life of a sealed battery is 3 years or less. When the replace battery indicator comes on, and the audible alarm sounds every 6 hours or so, we usually find batteries like the ones pictured above. The swelling happens when the battery will no longer take a charge from the UPS and the overcharging generates hydrogen gas which causes the battery case to swell.It's a little scary looking, but we've never had any kind of 'spillage' as the UPS alarm usually gives us a heads up.
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