The half a month ago, I bought a Tattu 12000mah 6s battery on ampow, which was relatively cheaper because of a coupon, and I received it three days later, I use it on my DJI s900, it works so nice. Recommend to you. Tattu battery really perfectly.
Yeah, Tattu is the world first battery brand who only focus on supplying power for drones, UAV, UAS, and FPV products. For DJI S900, 6S, 10000mAh ~ 15000mAh 15C(min) lipo drone batteries are okay. Enjoy.