battery piggyback

bad results as in the extra weight didn't increase flight time, unable to lift off or what?
 
Weight is everything flying a quad.
DJI engineers have carefully found the sweet spot that gives the best endurance and performance already.
If you burden your Phantom with that much extra weight, it would have to rev much harder to get into the air and the changed centre of gravity would upset balanced flight, making it hard for the flight controller to keep it together.
Too heavy + out of balance isn't a good mix.
 

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