Even if it doesn't void your warranty its not that much of a savings. Your link says its $92.00 but its only a 5350 mAh battery. The DJI Intelligent batteries are 5870 mAh which claims to give you a 30min flight time. I'm curious to see what the flight time is on the 5350 mAh battery.
Were.... with the advance and pro.... they moved up the 5870....I think they are just gonna phase out the 5350s. Alot of places are putting them on sale 50%off.