power supply/ 12 V battery charger ?

thanks guys. dont know what a wall wart is ?

Yea, and I'll bet you've had a hundred of them also,,,
Usually the red wire is the 12 volt, but to be safe use a small voltmeter and make sure it's 12 positive voltage, NOT 12 volt negative voltage. Cause a power supply makes both.
That's why I thought about a wall wart in 12 v. cause the scooter batteries are kinda small and don't need a big charger.
To change the subject just a little, the power supply from computers will make a good power supply to run a mobile CB radio as a base station, they put out 3 to 5 amps so they'll handle a tuned up regular CB, not a 50 - 100 watter.