Took off with a battery at 30% instead of 100%. Just grabbed the wrong one and did not check the lights when I powered it up. Flew for 6 minutes doing a panorama, shot a few more stills and then started to bring her home. As I was descending, she suddenly dropped very fast and landed hard in the grass. I had pushed the throttle up but could not stop it. Battery dislodged and one arm was broken.
If there was a warning on the screen, I missed it. I had earlier gotten an interference warning which often happens flying in the neighborhood. I ignored it. As it was falling, I saw "Autolanding" on the screen.
I put in a fresh battery and she powered up. Camera works and everything else seems OK. I have epoxied the arm back together and will test fly it tomorrow. If everything works, I will buy a new arm and repair her.
Log file shows I started at 30% and descended at 8%. Lesson learned.
