I'm not sure about the internal construction of a sealed lead acid battery, but if its anything like a normal lead acid car battery for example, then they are made so that the acid in them is supposed to completely cover the lead elements inside for production and storage of electricity through chemical reaction and conductive plates in each cell. If you tip them over then it follows that all or part of a plate or plates would then be exposed above the acid line. Hence lowered efficiency of the battery and the possibility of a cell, "dropping out".
I wouldn't risk tipping it over unless you contact the manufacturer direct for advice.
P.S. Also, a lesson learned through experience, don't charge the battery too long or you will stuff it! Ive lost two sealed units like that when i left them on charge for a week.
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