The YUAM329BS fit fine. Arrived last night, filled it and charged it overnight, and the bike is all buttoned back up. Needed a second pair of hands to help get the battery bolts back in; with the accessory wires on top, the bolt isn't long enough to catch the nut at the bottom, so Annie needed to prop it up slightly so it would catch. I'm always skeptical that the batteries are installed/prepped properly when they are trying to rush the bike out of the shop when you buy it, so at least I know that this one was prepped properly. Hopefully it will last the rest of this bike's lifetime, for that $57.