I calibrated my IMU with a level several weeks ago. I had recently ordered a new battery. I put it in and the pilot app showed that our needed a firmware update and a battery update. I sort of assumed that it was just a battery update. Unfortunately I had deleted the .bin file from the card. I reloaded it from the website and proceeded to update the aircraft with the new battery in it. The update went well. I'm not sure if it just updated the battery or the craft also. I did another IMU calibration but I'm not sure if I wasted my time. Is it normally necessary to re-calibrate the IMU after this? I don't want to seem like an idiot, but i hate assuming with a 3K craft and I'm just gathering information.