1) I'm not sure what the first warning was exactly. It caught me off guard. The battery indicator turned red and I believe it said some kind of critical battery warning. When I started the descent the battery indicator turned Amber while I flew a gentle descent back.
2) I don't know what's possible or not, just what it did.
1) Yes I do IMU calibrations with every Firmware upgrade and when I travel with it.
2)No, "Battery Overheat During Discharge" was in red displayed in the status window.
3) Yes, the cells were balanced.
4) Yes, I took it down to 8% about 10 flights back.
1) First I heard of that. I couldn't find it written anywhere and had read the opposite on a forum about cold wx flight.
2) I screwed up here. I was going by the -10°c limit in the battery guide. I had completely missed the 0° limit in the aircraft spec.
3) I was aware of the wind and was only using about half stick for horizontal speed.
4) I have never flown with the battery page up. I do have voltage displayed with the percentage but it is total voltage.