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<blockquote data-quote="RotorWash" data-source="post: 120197" data-attributes="member: 18210"><p>To me it appears to have been a battery issue probably due to it being partially depleted before taking off, made worse with the cold temps. Your log shows a voltage drop to below 3.3v per cell just a few seconds after takeoff. When the voltage is that low the drone will normally autoland immediately. If it manages to get below 3.0v per cell, the battery will turn itself off. Why the drone continued to gain altitude even though you had the throttle down, I'm not sure. The drone was acting as though it was doing a RTH but at that distance from the homepoint it should have landed where it was or rose at most 2.5m and returned to the HP. If the barometer was misreading that may explain it. Also noticed your VPS sensor altitude was sporadic but that might be related to the surface you were over.</p><p>[ATTACH=full]13717[/ATTACH]</p><p>Glad to hear no visible damage, I recommend doing a close inspection of the craft, checking all props, pins and motors for anything out of sorts, then afterwards complete an IMU calibration before the next flight.</p><p></p><p>Starting any flight with less than a fully charged battery is always a risk and cold temps can increase that risk. There's a great post over on PhantomPilots titled "<a href="https://phantompilots.com/threads/dji-batteries-and-cold-weather.150860/" target="_blank"><strong>DJI Batteries and Cold Weather . . .</strong></a>" if you're interested.</p></blockquote><p></p>
[QUOTE="RotorWash, post: 120197, member: 18210"] To me it appears to have been a battery issue probably due to it being partially depleted before taking off, made worse with the cold temps. Your log shows a voltage drop to below 3.3v per cell just a few seconds after takeoff. When the voltage is that low the drone will normally autoland immediately. If it manages to get below 3.0v per cell, the battery will turn itself off. Why the drone continued to gain altitude even though you had the throttle down, I'm not sure. The drone was acting as though it was doing a RTH but at that distance from the homepoint it should have landed where it was or rose at most 2.5m and returned to the HP. If the barometer was misreading that may explain it. Also noticed your VPS sensor altitude was sporadic but that might be related to the surface you were over. [ATTACH type="full"]13717[/ATTACH] Glad to hear no visible damage, I recommend doing a close inspection of the craft, checking all props, pins and motors for anything out of sorts, then afterwards complete an IMU calibration before the next flight. Starting any flight with less than a fully charged battery is always a risk and cold temps can increase that risk. There's a great post over on PhantomPilots titled "[URL='https://phantompilots.com/threads/dji-batteries-and-cold-weather.150860/'][B]DJI Batteries and Cold Weather . . .[/B][/URL]" if you're interested. [/QUOTE]
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