Here is a Simple Multi-Cell Charger
 

All you need is a charging station out of a remote and a 9V battery. solder the leads to the batt and there you have it. I charge my Dual cell car for 5 minutes and I get 5 minutes of charge time.

TIP: Make sure you hook it up right because if you switch the leads then it will short out and not charge the car. Just switch them and it will work.

Hope this helps!!!

9 volts ouch! bet them cells wont live very long!

I charge my twin cell ni mh for 3-4 mins (or until cell is warm) on 6 V - 4 aas!