Bought my Mavic Air 1 about 2.5 years ago. Had 2 batteries and flew less than 10 times on each with no problems. Then we moved to Seattle and Covid hit, so didn't fly it again for 18 months. When I took it out both batteries appeared totally dead. I bought 2 used batteries on the web, which also were low usage (6 and 15 flights) and also found a service in Portland (hyperflightdrones.com) that recovered my 2 "dead" batteries. They all charge up to full, hold the charge, and hold the charge (one solid, one blinking light) after I run them down to about 30%. Have done this with all of them now about 3 times.
Full Disclosure: I run the Maven control program (not DJI) on my iPhone 12 so I can use VR goggles when I fly (I mostly fly non-DJI FPV freestyle drones). I updated Maven, but no firmware on the drone or controller. I did recalibrate the compass before each flight as Maven required. I also started with new Master Airscrew Stealth props but those broke on the 1st 2 flight crashes so I went back to original props. The 4 flight logs included here are just the ones with issues, all with original props. By the end there are a few scrapes on the ends of a couple of these.
All of my flights since I got the batteries sorted have been hovering and slow cruising at low altitude. The problem is the drone rolls over and spirals down, then recovers if I was high enough or crashes if not. My first 2 flights (testing the batteries) encountered this flip-over after hovering and minimal cruising. It flipped over and crashed from about 6-8 feet high. I was near some power lines and an iron fence and was thinking maybe they caused some interference with the compass or radio. Didn't include those logs cause then I went to our club airfield (large hay field) where I don't have those issues.
I've never looked at any flight logs before this, so if I am not including all the needed info, please just ask. I used my free account on airdata.com. (Bat1 and Bat2 bought on web, Bat3 and Bat4 were my originals that were recovered from too low battery voltage.)
Nov. 17, 2021: Bat1 had 5 flight logs with no indicated problems (short test flights).
Nov. 17, 2021 12:29 -The 6th log starts at 6 min 45 sec and 67% bat. At 11 min. 36 sec. the drone roles over and there is a fast drop in altitude (15'on bar. 6' on sonar). At 11 m. 36.8 s. there is a Low Risk notification "Not Enough Force/ESC Error" repeated 4 times. The altitude readings are confusing, but I think this one may have hit the ground slightly, then recovered and I landed. I was never more than 65' from home, 14.2 mph, 20' high, and radio 100%.
Nov. 17,2021: Bat2 had 1 flight log with no incidents
Nov.17 2021 12:43 - The 2nd log starts at 3 m 11.6s. and 83% battery. At 7 m. 19.5 s. (62% battery) I got the same rollover and drop in altitude (17+' on bar. 6' sonar) was going 16 mph and 68' from home radio 100%. At 7 m. 19.5s. got a Medium Risk notification "Detected side shock / possible collision, aircraft is rolling sharply to the left" (there was no collision with anything and the wind was OK). At 7m. 21.1 s. got the "Not Enough Force/ESC Error" repeated 5 times, and at 7 m. 21.6 s. got Motor is blocked/Not Enough Force/ESC Error 28 times. I think this time it hit the ground and landed upside down.
Nov 17, 2021: Bat3 and Bat4 each flew for 14 min. and had no warnings or incidents. These were primarily to run down the batteries and so were mostly hovering with top speeds of 8 and 10 mph. I took them both back for more testing 6 days later. see below.
Nov. 23, 2021 1:30: Bat3 1st flight. At 5 m. 4.8 s. got Medium Risk notification "Detected side shock /possible collision, aircraft is rolling sharply to the left" (there was no collision). At 5 m. 5.2 s. got Medium Risk notification "Detected Front shock /possible collision, aircraft is pitching sharply forward" (there was no collision). Sonar indicated a 12' drop and Barometer a 15' drop in altitude. I think it crashed. No Motor Blocked or ESC Error notifications. Battery still at 74%. Max speed was 11 mph.
Nov 23, 2021 1:37: Bat3 2nd log starts at 5 m. 14 s. At 9 m. 59.6 s. (battery 47%) got Medium Risk notification "Detected side shock /possible collision, aircraft is rolling sharply to the left" (there was no collision). At 10 m. 0 s. got Medium Risk notification "Detected Front shock /possible collision, aircraft is pitching sharply forward" (there was no collision). Dropped about 20' but was high enough to recover. At 13.5 min. I landed it at 27% battery. Top speed was 12 mph and farthest distance 67'.
Nov. 23, 2021: Bat4 flew with no warnings and no problems. Max speed was 16 mph, max distance was 164 ', max height 33'. Couldn't get it to fail.
Any suggestions or ideas why this thing flips over would be greatly appreciated.
Full Disclosure: I run the Maven control program (not DJI) on my iPhone 12 so I can use VR goggles when I fly (I mostly fly non-DJI FPV freestyle drones). I updated Maven, but no firmware on the drone or controller. I did recalibrate the compass before each flight as Maven required. I also started with new Master Airscrew Stealth props but those broke on the 1st 2 flight crashes so I went back to original props. The 4 flight logs included here are just the ones with issues, all with original props. By the end there are a few scrapes on the ends of a couple of these.
All of my flights since I got the batteries sorted have been hovering and slow cruising at low altitude. The problem is the drone rolls over and spirals down, then recovers if I was high enough or crashes if not. My first 2 flights (testing the batteries) encountered this flip-over after hovering and minimal cruising. It flipped over and crashed from about 6-8 feet high. I was near some power lines and an iron fence and was thinking maybe they caused some interference with the compass or radio. Didn't include those logs cause then I went to our club airfield (large hay field) where I don't have those issues.
I've never looked at any flight logs before this, so if I am not including all the needed info, please just ask. I used my free account on airdata.com. (Bat1 and Bat2 bought on web, Bat3 and Bat4 were my originals that were recovered from too low battery voltage.)
Nov. 17, 2021: Bat1 had 5 flight logs with no indicated problems (short test flights).
Nov. 17, 2021 12:29 -The 6th log starts at 6 min 45 sec and 67% bat. At 11 min. 36 sec. the drone roles over and there is a fast drop in altitude (15'on bar. 6' on sonar). At 11 m. 36.8 s. there is a Low Risk notification "Not Enough Force/ESC Error" repeated 4 times. The altitude readings are confusing, but I think this one may have hit the ground slightly, then recovered and I landed. I was never more than 65' from home, 14.2 mph, 20' high, and radio 100%.
Nov. 17,2021: Bat2 had 1 flight log with no incidents
Nov.17 2021 12:43 - The 2nd log starts at 3 m 11.6s. and 83% battery. At 7 m. 19.5 s. (62% battery) I got the same rollover and drop in altitude (17+' on bar. 6' sonar) was going 16 mph and 68' from home radio 100%. At 7 m. 19.5s. got a Medium Risk notification "Detected side shock / possible collision, aircraft is rolling sharply to the left" (there was no collision with anything and the wind was OK). At 7m. 21.1 s. got the "Not Enough Force/ESC Error" repeated 5 times, and at 7 m. 21.6 s. got Motor is blocked/Not Enough Force/ESC Error 28 times. I think this time it hit the ground and landed upside down.
Nov 17, 2021: Bat3 and Bat4 each flew for 14 min. and had no warnings or incidents. These were primarily to run down the batteries and so were mostly hovering with top speeds of 8 and 10 mph. I took them both back for more testing 6 days later. see below.
Nov. 23, 2021 1:30: Bat3 1st flight. At 5 m. 4.8 s. got Medium Risk notification "Detected side shock /possible collision, aircraft is rolling sharply to the left" (there was no collision). At 5 m. 5.2 s. got Medium Risk notification "Detected Front shock /possible collision, aircraft is pitching sharply forward" (there was no collision). Sonar indicated a 12' drop and Barometer a 15' drop in altitude. I think it crashed. No Motor Blocked or ESC Error notifications. Battery still at 74%. Max speed was 11 mph.
Nov 23, 2021 1:37: Bat3 2nd log starts at 5 m. 14 s. At 9 m. 59.6 s. (battery 47%) got Medium Risk notification "Detected side shock /possible collision, aircraft is rolling sharply to the left" (there was no collision). At 10 m. 0 s. got Medium Risk notification "Detected Front shock /possible collision, aircraft is pitching sharply forward" (there was no collision). Dropped about 20' but was high enough to recover. At 13.5 min. I landed it at 27% battery. Top speed was 12 mph and farthest distance 67'.
Nov. 23, 2021: Bat4 flew with no warnings and no problems. Max speed was 16 mph, max distance was 164 ', max height 33'. Couldn't get it to fail.
Any suggestions or ideas why this thing flips over would be greatly appreciated.
