Went out tonight with friends to fly around some local lakes, all batteries charged yesterday. First flight was uneventful , up to 400ft and flying around the lakes came back and landed to change the battery.
2nd flight took off climbed up to around 240ft and started flying back towards the lakes. Few seconds Not enough Force/ESC error, battery then went from 95% to 0% , it then went into a forced landing, I was over large bushes at the time and I managed to input and fly straight and it landed safely in a field 500ft away. When I recovered it GO app was still showing 0%, however Airdata has it changing back to 92%
Prior to first flight it mentioned about the firmware updated, but as I was not on wi-fi , I did not update in the field.
I then flew with a 3rd battery no issues.
Any thoughts? Props are master airscrew, all checked all good.