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UPS batteries are the same chemistry as sealed marine batteries. Two issues arise. One is charging current. The UPS can't charge a battery much larger than it's designed to. 20% larger shoulda be fine, though. Many large UPS systems have a connector to add an extra battery though, and those are designed for the extra current.
The other issue is discharge current - a larger battery will let the UPS run longer, but won't let it run more equipment. A UPS designed to power one desktop for ten minutes can NOT safely power three desktops for three minutes. Therefore adding batteries or using a larger battery only means it can run longer than ten minutes. That really doesn't do you a lot of good. After five minutes, the power probably isn't going to come back on any time soon, so it's time to shut down. Neing able to run from UPS for twenty minutes instead of ten just doesn't do you much good.
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