Today I was going to fly my IRIS quadrocopter. But flight was not successful due to power issue.
For this flight I was using fully charged batteries which were working fine 2 weeks ago. Before launch battery readings were at 12.3 volts. Once I took off, the telemetry started to show low voltage - 9.6 volts on other battery and 10.2 on another try and IRIS started beeping signaling that there is a low voltage condition. I decided not to take a risk and landed fast.
I'm trying to figure out why there was a power failure. Can it be due to cold weather? There was -8 degrees celsium outside, and batteries were held for approximately 30 minutes at approximately +5-10 degrees before I started using them.
If so, what are general recommendations on how to fly in cold weather? Or should I look for another power failure reason?