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calibrating should be in owners manual. like said above also with model # of esc and searching should give you a manual dl or you can see correct procedure. 5 cells is 7.5volts while 2 cell is almost a volt more 8.4volts.

Are your escs rated to handle the batteries you have chosen? A 2 cell lipo is actually 8.4volts fully charged... did you calibrate esc to radio(a must)