Mat is absolutely right, 25 size electric can handle 4S max. you need to reasses your cell count for those. A good 25 can make about 500 watts reliably, so 3 x that is 1500. That would fly a 15 lbs plane well. Flight time will be directly linked to battery capacity, I'd say 8000mah/25C to handle the max 32amp X3 = 96amp at max throttle. I'd be tempted to use 60 amp Esc's, way easier to keep cool, I use Turnigy Plush. The Plush 40 would likely be fine here, mine have been pushed to 55 amps without issue( briefly). FWIWflytreetimes
