Hi All, I have two original 2200 mAh battery packs for DJI Phantom 1 Quadcopter. I bought these battery packs at the same time. But recently I have a shorter flight time with one of these batteries. I'm flying with a FC40 camera installed on a brushless gimbal. With this configuration I am having approximately 9 minutes of flight time with one of the batteries. But I can only fly around 5.5 - 6 minutes with the other one. I use imax B6 balance charger and I keep my batterties in storage mode. And both of the batteries are genuine DJI batteries (batteries are only 3 months old). What can be the cause of this shorter flight time? Is my lipo battery dying? Are there any options that I can do to increase its poor performance? Thanks.