About to put the finishing touches on my Seagull Models Pilatus PC-9 1.20. The reviews used either a 5 cell 2500-2700 maH NiMH battery. My buddy gave me a pretty much new 4 cell 2700 maH NiMH battery and was wondering if that would be alright. Using an evolution 1.20 two stroke with 7 spektrum servos. 2 of the servos being used are for the retract system.