5 cell FlightPower and havin fun!

The Quarks are good controllers, but if you call S&T and tell them that you are running their controller in an 1/8 scale conversion, they will tell you that it IS a 1/10 scale controller. Although the Monster Pro's specs are impressive when you run across that 300A surge spec, it can be misleading. The MP is only rated to 125A continuous.

Spinning a 1515/1Y up to the number of rpms that it gets to on 5S causes that motor to draw a bunch of current. To be safe, I'd say that 4S is probably the max that you should go with the Quark and the 2200kv 1515 motor.

If you've gotta go faster, go for higher voltage like 5S or 6S with a lower kv motor and gear it up.

BTW, Quark is really good about the warranty. Just send the controller in and you'll have a new one back before you know it. I suppose that sending in a receipt could help, but I've never had to.