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A little risky the first time, but you'll get used to it. Just don't make sudden, jerky moves.
Sounds like you're gonna have to get that wire soldered back on. If you're not comfortable with soldering then I would take it to someone who wouldn't mind doing it (friend/relative/COMPUTER REPAIR STORE).
The reason it works on the charger is because when it's on the charger, it's using the charger's batteries to run the car. It doesn't use the car's battery while on the charger.
If it's running into a problem charging, then it will work on the charger just fine, but will poop out off the charger.
Again, get that wire fixed before you do anything else.
RULE # 1: ONE MODIFICATION AT A TIME.
If you do too much at one time, you may never figure out what you did to fix/break the car.
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