I own 4 Yuneec Typhoon Q500 4K birds and have scads of batteries. After getting the first one, I charged everything up right away before learning about this battery storage issue. I was able to successfully discharge the batts to 50% by removing the camera (did not want to burn in the optics while it sat there static on one object) and removing the props. I then went into the ST10, switched it to Angle mode and the slider to Rabbit. I then and turned on the cameraless Q500 and switched the GPS off on the ST10. Next, I hit the red button to start the motors, and then pushed the left stick all the way forward and released it. This last step made the motors "idle" at a higher speed and thus discharge faster. The ST10 permits you to keep track of the discharge level of the batt on the right side of the ST10 screen. Once it hit 50%, I switched off the drone, removed the battery, and moved to the next one. I did find that in some cases I had to push the left stick forward a few times during the discharge. One side note, you will have to plug the ST10 into a charger during this process if you have very many batteries. It did not care if it was plugged in or not. Worked great with no problems. Does take some time. You will have to switch the GPS off again every time you change the batt.