Hi, im new at this, have question maybe someone upgraded batteries on h920+? Now using 2x nano-tech 4000mha 25-50c 623grams (each), i think i found that 1 motor has 2kg lift power. Planing to buy 2x 8000mah 15c weight 1110g (each), will that not kill my drone flying with camera? Now in getting 20min fly time until first warning