I will have an exact measurement as soon as the new battery comes and I can take apart the side cover but I would say about a 1/2 inch too tall. It won't clear a plastic piece with a screw in it. Today I took my TT250 out of storage and sure enough the battery is dead. Actually very strange things happened. When the ignition switch was set to on nothing happened. No lights no instrumentation nothing. However when I switched the ignition off the digital display did its test sequence for a few seconds or so. When switching the ignition back to on the display would turn off. It has been a really long time that I have seen it but perhaps the battery polarity reversed itself? Again I have only seen it a few times and that was like 30 years ago. Had a deep cycle marine battery that was not used in a while somehow reverse itself over a season. Had a car battery randomly do it in an old Honda Civic but its not something I have seen lately! Tried to kick start the TT250 and I got a few good kicks but then got to a point when every time I was fighting the compression. It had not been ran in a while so it needs some good solid kicks to prime the carb. Should have the replacement battery in 2 or 3 days. Once in I will grab my tools and the new battery take it to my storage unit and swap it out. Won't take long!