They are much more sensitive to being over charged, so if your charging system is crude or out of spec it can ruin the battery right off, also because it's not flooded, when it vents there is no way to get it back and if you live in a cold part of the country some of the sealed batteries don't like getting below -20F, so if you store your motorcycle in an unheated garage the winter alone can destroy the battery in one bitter cold night.
But for a lot of people sealed batteries should work just fine, most people don't water their battery anyway.
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