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@Bad_Science
If you keep having a problem, it might be the battery itself.
I bought the emergency power pack because my bike kept dying. Eventually the cheap crappy battery originally supplied with the bike was found to be to blame, but since I changed to a Motobatt one I have had no problems. It's a "Glass Mat Battery", whatever that means, and bright yellow like a piece of lego, but the bike starts every time now. It was even supplied fully charged, so I literally put it in and drove away.