Not flown in about 3/4 months. Had the batteries stored and I assumed discharged after 10 days etc. Now charging everything back up including RC. Other than checking the props are on securely and updating any firmware. Should I re calibrate the IMU and compass as a precaution the location will be the same as 3 months ago? Is there anything I need to be made aware of other than the obvious such as checking the IMU values and RTH height etc?