I think you are getting things mixed up. the data sheet says it will pull 1.7a @ 10v. Basically this means it will draw 1.7 amps when you supply it with a 10 volt source. Your 4 cell battery (14.8v) is higher than 10 volts so i would expect the motor to draw more current.
I would expect your no load RPM to be 650 x 14.8 = 9620, which is closer to what you have measured.
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