I have a 600mah pack that came with my radio/flight pack. I can get 3-4 flights out of it before my voltage starts dropping too low (my instructor says he doesn't like to fly with the volts below 5.0) and my instructor says its time to pack it up. I figure I have 2 options to get more flights in when I go fly. First is to buy a higher mah battery pack. The second is to invest in a charger, which I figure I'll eventually want to do anyway.

I have an old peak charger that I used to use when I was racing off road electric cars. It can range 0.5 to 10 amps and the manual says I can use it with a 4cell pack if I use the the dropping resistor.

Can I use my old car charger? what settings do I need to use. If not I'd like some recommendations for a good economical charger

Thanks