So, my bike stalled out - I didn't give it enough gas when I let up the clutch. Then, when I went to turn it back on, no power. So, I connected it to a portable charger for a while, to get the battery some power, then tried to start it, and it tried to turn over, but didn't. After it tried to turn over, the bike started a clicking sound until I let go of the start button. Any ideas?