how long should i charge a dual cell with a 6volt charger?
 

How long should i charge a dual cell if im using 4aa batteries as my charger?
I will be using stock batteries

Depends how many mah your battery is.

The stock 50mah battery, about 2 min. No more than 3. 150mah, about 5min., no more than 7 min..

When charging your car without a timer, keep an eye on it. I've heard too many melted car stories. A properly charged battery should be warm, but not hot. if it get hot, get it off the charger immediately.

I will be using the stock battery.
So around two minutes if im using 4AAs as my charger. Ok, sounds good!