Currently i Have a duratrax 235 charger that takes about an hour to charge lipos.

What i am looking for is a dual or quad charger that will charge the batteries in 15 mins. Anyone have any good ideas for me?

What size batteries ?

To charge a 5000mah sized pack in 15 mins requires a charger with a 20 amp output

Your battery needs to be able to handle a 4c charge rate

Cheers

Only way to cut lip charge time is to charge at higher C rates, 4C charge rate will theoretically charge lipo is 15min.

You need to size charger and power supply based on the lipos you want to charge charging at 4C assuming the lipo are rated for at least 4C charging.