It is the battery or battery connection. I would change the battery. If the battery won't hold a charge, you are just asking for more trouble by riding it.
If the size of the cable limits the amperage it will get extremely hot. 12v is 12v, the bike will only draw the current it needs. If you have the car running it could be outputting up to ~15v depending on the car.... so that might be a bad idea.
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