I am planning out my PT109 Lindberg kit, using two engines and 1 ESC. I've seen some article that if you hook the batteries up in Parallell (sp) you get a lot of speed and they run time really goes down. If you hook up in Series, you do'nt get as much speed as the motors might be getting like 3 volts, but you also get longer run times. Can anyone help me here. Sorry about the spelling. Thanks.