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Critical low battery triggered with 60%. Autoland. please help
1323 18 2018-5-13
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fansf2304bca
lvl.4
Flight distance : 952664 ft
Chile
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I was at almost 2 km with my mavic air when battery went from 60% to 0%. Autolanding started. I managed to get the craft closer and looked for a save place to land. I found it floating on the air at 1 meter high. I want to know what happened.
Please help me analyze the logs:

http://www.phantomhelp.com/LogViewer/MQ0OJK89H2UDH9T03ZHS/
2018-5-13
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Jeff7577
First Officer
Flight distance : 1916821 ft
United States
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Using the latest firmware?
2018-5-13
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hallmark007
Captain
Flight distance : 6153264 ft
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Ireland
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It looks like a failing with app, as you can see aircraft battery still had power. Are all batteries on latest firmware, reason I ask is I’ve seen similar case and problem was with firmware. But it still should not happen.
2018-5-13
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JJBspark
Captain
Flight distance : 6313058 ft
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Netherlands
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Hi,

Had a very fast first look, your batt voltage per cell are lower than normal for the indicating %.

        cell1 V        cell2 V        cell3 V        TOT V        %
Yours        3,801        3,769        3,779        11,325        99
Mine        4,298        4,291        4,291        12,864        99

IMO your saw indicating 100% wich was actually much lower. Best to get your advice and help from DJI support.

BTW, you had a compass error in the start of your flight, my advice is to return to home and check that out.

Cheers JJB

2018-5-13
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fansf2304bca
lvl.4
Flight distance : 952664 ft
Chile
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Jeff7577 Posted at 2018-5-13 10:55
Using the latest firmware?

Yes and last app version.

2018-5-13
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fansf2304bca
lvl.4
Flight distance : 952664 ft
Chile
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hallmark007 Posted at 2018-5-13 11:00
It looks like a failing with app, as you can see aircraft battery still had power. Are all batteries on latest firmware, reason I ask is I’ve seen similar case and problem was with firmware. But it still should not happen.

Yes. Aircraft battery RC and app was up to date.
2018-5-13
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fansf2304bca
lvl.4
Flight distance : 952664 ft
Chile
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JJBspark Posted at 2018-5-13 11:03
Hi,

Had a very fast first look, your batt voltage per cell are lower than normal for the indicating %.

This is the value with 99% battery?  If so your right. It is pretty low. I'm thinking a battery malfunction.
2018-5-13
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B1houdini
Captain
Flight distance : 790909 ft
United States
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Checked other forum post for what happened to you and found this:

Found with the MA, if the signal between RC and AC isn't that good, DJI Go 4 doesn't refresh the battery as often and the % indicator can sit at any one point for quite a while. As the signal quality improves, sometimes a huge chunk of battery goes missing as it "updates".
Just something to be weary of, It might leave you stranded thinking you have more battery left then you really did. My Spark and MP didn't have this issue.

Another post said it might have to do with the temperature you were flying in:
Very low temperature, batteries internal resistance goes up, voltage drops under load Software thinks battery is empty because voltage is low, Auto-Land starts.

Hope you get your problem answered.
Keep us informed.
2018-5-13
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GDL
First Officer
Flight distance : 1498789 ft
United States
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Try recharging battery fully with latest firmware. Hover MA close you and see if still has problem. You need upgrade firmware for each of the battery.
2018-5-13
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HedgeTrimmer
Captain
United States
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Normal for battery voltage to drop then recover?  Strange sudden drop to 0%, but after voltage went back up, stayed at 0%.
60% - 11.281v - 0.020v
60% - 11.263v - 0.019v
60% - 11.263v - 0.019v
00% - 11.263v - 0.019v
.......................................
00% - 11.263v - 0.019v
00% - 11.263v - 0.019v
00% - 11.383v - 0.010v

2018-5-13
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fansf2304bca
lvl.4
Flight distance : 952664 ft
Chile
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B1houdini Posted at 2018-5-13 13:20
Checked other forum post for what happened to you and found this:

Found with the MA, if the signal between RC and AC isn't that good, DJI Go 4 doesn't refresh the battery as often and the % indicator can sit at any one point for quite a while. As the signal quality improves, sometimes a huge chunk of battery goes missing as it "updates".

I don't think any of this could be the problem. Signal was perfect 100% of the time. And the temperature outside was of 15 Cº, which is perfectly good to fly. Thanks anyway
2018-5-14
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fansf2304bca
lvl.4
Flight distance : 952664 ft
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GDL Posted at 2018-5-13 18:41
Try recharging battery fully with latest firmware. Hover MA close you and see if still has problem. You need upgrade firmware for each of the battery.

I will make a test hovering and check the voltage values. The firmware was up to date. Thanks.
2018-5-14
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sky6105
First Officer
Flight distance : 345653 ft
United States
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I had the same issue and was told to drain the battery recharge and reinstall the firmware.
I never had another issue with that battery.
If you are flying more then one battery number them to keep track of any issues.
Safe Flying.
2018-5-14
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DJI Elektra
Administrator
China
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fansf2304bca Posted at 2018-5-13 11:25
This is the value with 99% battery?  If so your right. It is pretty low. I'm thinking a battery malfunction.

In your situation, please export the flight data and the black box for analysis. You can upload it to dropbox and post the link here. You can take the video as reference. Thanks for your support.
2018-5-20
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fansf2304bca
lvl.4
Flight distance : 952664 ft
Chile
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DJI Elektra Posted at 2018-5-20 23:37
In your situation, please export the flight data and the black box for analysis. You can upload it to dropbox and post the link here. You can take the video as reference. Thanks for your support.
https://www.youtube.com/watch?v=SMb1RD5pPOg&t=38s

Here are the logs from the APP. I wasn't able to get the black box because the Dji assistant was loading for ever and never let me get it. Now the drone is in the Chile DJI store for review. I'll appreciate any help  you can provide. Best regards.

https://www.dropbox.com/sh/djjcv ... S8OSWoOW9CBBja?dl=0
2018-5-21
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DJI Diana
Administrator
Flight distance : 2408 ft

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fansf2304bca Posted at 2018-5-21 07:27
Here are the logs from the APP. I wasn't able to get the black box because the Dji assistant was loading for ever and never let me get it. Now the drone is in the Chile DJI store for review. I'll appreciate any help  you can provide. Best regards.

https://www.dropbox.com/sh/djjcvk0lodmbgcv/AADe77McG_pS8OSWoOW9CBBja?dl=0

Hi, sorry for the late response, thank you for providing the flight record, it has been forwarded to our engineers for a check, if there is an update, we'll let you know at the first time.
2018-5-23
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fansf2304bca
lvl.4
Flight distance : 952664 ft
Chile
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DJI Diana Posted at 2018-5-23 02:32
Hi, sorry for the late response, thank you for providing the flight record, it has been forwarded to our engineers for a check, if there is an update, we'll let you know at the first time.

Thanks Diana,

the drone is still on the Chilean DJI store for analysis, it is been more that 10 days and I still does not have a answer. I hope they can find a solution quickly.
2018-5-25
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fansf2304bca
lvl.4
Flight distance : 952664 ft
Chile
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DJI Diana Posted at 2018-5-23 02:32
Hi, sorry for the late response, thank you for providing the flight record, it has been forwarded to our engineers for a check, if there is an update, we'll let you know at the first time.

Hello Diana,

finally the DJI Store returned my drone. They gave me a new battery. They tested the drone with the old battery and the same error happened with 60%. They did another try and after turning it on it showed 0% so it didn't even could be put on air. Then it was tested with a new battery two times and it worked with no issues. Thanks for your help.

Best regards.
2018-5-26
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DJI Diana
Administrator
Flight distance : 2408 ft

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fansf2304bca Posted at 2018-5-26 04:41
Hello Diana,

finally the DJI Store returned my drone. They gave me a new battery. They tested the drone with the old battery and the same error happened with 60%. They did another try and after turning it on it showed 0% so it didn't even could be put on air. Then it was tested with a new battery two times and it worked with no issues. Thanks for your help.

Hi, thank you so much for your update, glad to know that you have got a new battery, hope you have a good time on flying the drone.
2018-5-29
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