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You could probably get by with NICads. I don't remember any really special conditions for charging them and they can pull a strong current for starting the bike. Their normal voltage /cell is 1.2V so you'd need to series up ten of them for 12 V. Looks like the standard lead acid for that bike is 12Ahrs. Don't know that you would absolutely need that much reserve, but probably ought to try to get close to that. The RC guys have some decent posts on how to solder cells together if that is the route you choose.
JJ
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