Low voltage emergency landing

[Darrell1277]

Twice now I've had my mini 4k give the message "low voltage, emergency landing". Then it landed. I was able to retrieve it both times and it landed.safely. The battery was still almost fully charged. Any insights in to what could cause this?

 

[AeroJ]

1. How cold a day was it ?
2. How old are those battery packs / how many cycles on them ?

Most insights to what caused this should be available in the flight logs and on the battery status page within DJI Fly app. We need to know what the cell voltage levels were doing, before, at the time of the flight and now.

 

[Darrell1277]

Here is a screen shot of the flight log where it landed. Notice it's still showing 87% while emergency landing.

 

[AeroJ]

Unfortunately the screenshot doesn't show us voltage levels, but it does, as you say show you back at 87%.
But it also shows that at the time of the screenshot you were slowly descending and not moving very fast, so whatever sag had potentially caused the low voltage error had passed, and the battery had bounced back up to nominal levels. That's why we need the actual logs to see what that was doing at the time of the error message, and just before it.

I do notice you were in Sport Mode, which would have put the most demand on the packs when you did sharp ascends and / or fast forward movement, or if the craft has to fight a lot of turbulent wind...