Upgrading battery noobie question.

I have these motors on my quad: 

https://hobbyking.com/en_us/multistar-350-to-450-frame-size-2212-combo-set-with-self-tightening-propellers-cw-ccw-set-of-2.html

with DJI 9443 props. 

My quad has to sit on 70% throttle to stay in the air and when the bat

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