Hi,

I've been getting my Mavic Air disconnected during flights. I checked the logs and found the same error:

[L-BATTERY]get_cell_voltage_callback_ack failed!

I use the same batteries as always, nothing was updated...

What can be a reason for the error and disconnect?

Thank you!

I checked the batteries each time the drone disconnected but they are full and after the drone is back I just connect it again and fly it... and then after a couple of minutes the drone disconnected again with the same error

Hi,

There are so many more errors like this in the DAT file, all [L-BATTERY] et etc
Seen in MM and MA2 DAT files.

I cannot find a connection to disconnection and these messages.

cheers
JJB

Maybe the following log can be helpful?

.000 :    6516 [L-FMU/MOTOR]Start. reason:ACT.Takeoff
.000 :    6516 [L-PWM]set actuator mode:CTRL
.000 :    6516 [L-FDI]tilt when motor on = 0.039855, static flag = 0
.002 :    6516 [L-FMU/FSM]state changed. cur: on ground
.020 :    6517 [L-IOC]Set CL.  45.7 Degree
.020 :    6517 [L-TAKEOFF]alti: 101.133347 tors: 45.723377
.615 :    6546 [L-FDI][sensor_api_info] head(2,0,31,4).|
1.495 :    6590 [L-N_MIS]Exit mis 4. New mis 6
1.495 :    6590 [L-N_MIS]Switch new mis 6 req 6 from mis 4 req 6
2.480 :    6640 [L-FMU/FSM]state changed. cur: in air
2.494 :    6641 [L-HOME]Update. lati:31.8838972 longti:34.9577952 alti:121.13
2.889 :    6660 [L-FMU/FSM]not near ground
2.942 :    6663 [L-N_MIS]req abort all for reach target height
2.947 :    6663 [L-TAKEOFF]exit auto takeoff plan!
2.957 :    6664 [L-N_MIS]Switch new mis 3 req 2 from mis 26 req 16
2.957 :    6664 [L-FLYMODE]SWITCH2HOVER!
3.034 :    6668 [L-FMU/FSM]near ground
3.112 :    6672 [L-RC]Emergency break. rc vib!
3.850 :    6709 [L-FMU/LED]action changed. set home0)
5.470 :    6790 [L-NS][AHRS] reset baro just after takeoff
5.945 :    6814 [L-FMU/LED]action changed. Normal Flash(0)
5.945 :    6814 [L-FMU/LED]type:0, normal flash action:
5.945 :    6814 [L-FMU/LED]c0:0,15;c1:0,3;c2:0,13;c3:2,3;c4:0,10;c5:0,3;c6:0,10;c7:0,3
7.840 :    6909 [L-CTRL]Plant gain uncer comp: SUCCESS, comp gain: 1.000000
10.080 :    7021 [L-FMU/FSM]not near ground
10.094 :    7022 [L-FMU/MOTOR]safe_near_grd:false
15.659 :    7300 [L-BATTERY]get_cell_voltage_callback_ack failed!||
16.576 :    7346 [L-FDI][sensor_api_info] head(2,0,31,4).|
32.532 :    8146 [L-FDI][sensor_api_info] head(2,0,31,4).|
41.591 :    8600 [L-BATTERY]get_cell_voltage_callback_ack failed!||
48.490 :    8946 [L-FDI][sensor_api_info] head(2,0,31,4).|
55.794 :    9312 [L-NS][AHRS],qg obv buffer size[218/270]
55.794 :    9312 [L-NS][AHRS],pva obv buffer size[238/270]
61.539 :    9600 [L-BATTERY]get_cell_voltage_callback_ack failed!||
62.537 :    9650 [L-BATTERY]get_cell_voltage_callback_ack failed!||
64.451 :    9746 [L-FDI][sensor_api_info] head(2,0,31,4).|
68.521 :    9950 [L-BATTERY]get_cell_voltage_callback_ack failed!||
76.521 :   10352 [L-RC]rc_connect:1=>0
76.521 :   10352 [L-RC]rc_func_disable @ [209920 ms]
77.040 :   10378 [L-RC]rc_connect:0=>1
77.040 :   10378 [L-RC]rc_resume @ [210440 ms]
77.040 :   10378 [L-RC]set rc_resume_lock
77.538 :   10403 [L-RC]clr rc_resume_lock
77.658 :   10409 [L-RC]rc_connect:1=>0
77.658 :   10409 [L-RC]rc_func_disable @ [211060 ms]
78.656 :   10459 [L-RC]rc_connect:0=>1
78.656 :   10459 [L-RC]rc_resume @ [212060 ms]
78.656 :   10459 [L-RC]set rc_resume_lock
79.154 :   10484 [L-RC]clr rc_resume_lock
80.407 :   10546 [L-FDI][sensor_api_info] head(2,0,31,4).|
81.728 :   10613 [L-FMU/LED]action changed. forearm LED outer ctrl off:Ctrl forearm LED off by cam(2)
82.326 :   10643 [L-FMU/LED]action changed. Normal Flash(0)
96.368 :   11346 [L-FDI][sensor_api_info] head(2,0,31,4).|
96.449 :   11350 [L-BATTERY]get_cell_voltage_callback_ack failed!||
102.433 :   11650 [L-BATTERY]get_cell_voltage_callback_ack failed!||
104.428 :   11750 [L-BATTERY]get_cell_voltage_callback_ack failed!||
105.425 :   11800 [L-BATTERY]get_cell_voltage_callback_ack failed!||
106.423 :   11850 [L-BATTERY]get_cell_voltage_callback_ack failed!||
107.420 :   11900 [L-BATTERY]get_cell_voltage_callback_ack failed!||
108.417 :   11950 [L-BATTERY]get_cell_voltage_callback_ack failed!||
110.412 :   12050 [L-BATTERY]get_cell_voltage_callback_ack failed!||
111.410 :   12100 [L-BATTERY]get_cell_voltage_callback_ack failed!||
112.324 :   12146 [L-FDI][sensor_api_info] head(2,0,31,4).|
112.407 :   12150 [L-BATTERY]get_cell_voltage_callback_ack failed!||
113.404 :   12200 [L-BATTERY]get_cell_voltage_callback_ack failed!||
114.402 :   12250 [L-BATTERY]get_cell_voltage_callback_ack failed!||
115.638 :   12312 [L-NS][AHRS],qg obv buffer size[218/270]
115.638 :   12312 [L-NS][AHRS],pva obv buffer size[238/270]
123.378 :   12700 [L-BATTERY]get_cell_voltage_callback_ack failed!||
128.285 :   12946 [L-FDI][sensor_api_info] head(2,0,31,4).|
136.262 :   13346 [L-FDI][sensor_api_info] head(2,0,31,4).|
137.262 :   13396 [L-FDI][sensor_api_info] head(2,0,31,4).|
139.256 :   13496 [L-FDI][sensor_api_info] head(2,0,31,4).|
143.244 :   13696 [L-FDI][sensor_api_info] head(2,0,31,4).|
151.225 :   14096 [L-FDI][sensor_api_info] head(2,0,31,4).|
151.306 :   14100 [L-BATTERY]get_cell_voltage_callback_ack failed!||
167.184 :   14896 [L-FDI][sensor_api_info] head(2,0,31,4).|
175.482 :   15312 [L-NS][AHRS],qg obv buffer size[218/270]
175.482 :   15312 [L-NS][AHRS],pva obv buffer size[238/270]
178.236 :   15450 [L-BATTERY]get_cell_voltage_callback_ack failed!||
183.140 :   15696 [L-FDI][sensor_api_info] head(2,0,31,4).|
199.101 :   16496 [L-FDI][sensor_api_info] head(2,0,31,4).|
206.163 :   16850 [L-BATTERY]get_cell_voltage_callback_ack failed!||
215.057 :   17296 [L-FDI][sensor_api_info] head(2,0,31,4).|
231.015 :   18096 [L-FDI][sensor_api_info] head(2,0,31,4).|
231.098 :   18100 [L-BATTERY]get_cell_voltage_callback_ack failed!||
234.090 :   18250 [L-BATTERY]get_cell_voltage_callback_ack failed!||
235.087 :   18300 [L-BATTERY]get_cell_voltage_callback_ack failed!||
235.327 :   18312 [L-NS][AHRS],qg obv buffer size[218/270]
235.327 :   18312 [L-NS][AHRS],pva obv buffer size[238/270]
246.974 :   18896 [L-FDI][sensor_api_info] head(2,0,31,4).|
262.017 :   19650 [L-BATTERY]get_cell_voltage_callback_ack failed!||
262.934 :   19696 [L-FDI][sensor_api_info] head(2,0,31,4).|
264.268 :   19763 [L-MIS][SDK] old open GS(app)
264.268 :   19763 [L-MIS]received on/off 2 from dev 1
264.269 :   19763 [L-MIS]ack on/off 0 to can
273.986 :   20250 [L-BATTERY]get_cell_voltage_callback_ack failed!||
274.150 :   20259 [L-MIS][SDK] new open GS(cam)
274.150 :   20259 [L-MIS]received on/off 1 from dev 2
274.150 :   20259 [L-MIS]ack on/off 0 to can
274.153 :   20259 [L-SDK]app API sub_mode 2 2
274.153 :   20259 [L-MIS][NAVI MISSION] req sub_mode: Pointing on
274.153 :   20259 [L-SDK][USER]send ack 0x00
274.190 :   20261 [L-N_MIS]Exit mis 3. New mis 14
274.190 :   20261 [L-N_MIS]Switch new mis 14 req 4 from mis 3 req 2
274.984 :   20300 [L-BATTERY]get_cell_voltage_callback_ack failed!||
275.423 :   20323 [L-FMU/LED]action changed. forearm LED outer ctrl off:Ctrl forearm LED off by cam(2)
278.893 :   20496 [L-FDI][sensor_api_info] head(2,0,31,4).|
280.968 :   20600 [L-BATTERY]get_cell_voltage_callback_ack failed!||
281.965 :   20650 [L-BATTERY]get_cell_voltage_callback_ack failed!||
282.963 :   20700 [L-BATTERY]get_cell_voltage_callback_ack failed!||
283.960 :   20750 [L-BATTERY]get_cell_voltage_callback_ack failed!||
284.958 :   20800 [L-BATTERY]get_cell_voltage_callback_ack failed!||
285.955 :   20850 [L-BATTERY]get_cell_voltage_callback_ack failed!||
288.728 :   20990 [L-RC]rc cmd:STD_PAUSE_CUR_MIS
288.728 :   20990 [L-FLYMODE]CTRL rc none mission!
288.947 :   21000 [L-BATTERY]get_cell_voltage_callback_ack failed!||
290.308 :   21069 [L-SDK]app API sub_mode 2 0
290.308 :   21069 [L-MIS][NAVI MISSION] req sub_mode: Pointing off
290.308 :   21069 [L-SDK][USER]send ack 0x00
290.311 :   21069 [L-MIS][SDK] new open GS(cam)
290.311 :   21069 [L-MIS]received on/off 2 from dev 2
290.311 :   21069 [L-N_MIS]req abort all for USER.mission.request.off
290.311 :   21069 [L-MIS]ack on/off 0 to can
290.328 :   21070 [L-N_MIS]Switch new mis 3 req 2 from mis 26 req 16
290.328 :   21070 [L-FLYMODE]SWITCH2HOVER!
290.384 :   21073 [L-FMU/LED]action changed. Normal Flash(0)
290.942 :   21100 [L-BATTERY]get_cell_voltage_callback_ack failed!||
291.939 :   21150 [L-BATTERY]get_cell_voltage_callback_ack failed!||
292.937 :   21200 [L-BATTERY]get_cell_voltage_callback_ack failed!||
292.947 :   21201 [L-NS][comm] ext ns disconnect2

Or the next flight:

.000 :    4417 [L-FMU/MOTOR]Start. reason:ACT.Takeoff
.000 :    4417 [L-PWM]set actuator mode:CTRL
.000 :    4417 [L-FDI]tilt when motor on = 0.095690, static flag = 0
.001 :    4417 [L-FMU/FSM]state changed. cur: on ground
.020 :    4418 [L-IOC]Set CL.  89.4 Degree
.020 :    4418 [L-TAKEOFF]alti: 97.699242 tors: 89.575211
.315 :    4432 [L-FMU/FSM]state changed. cur: in air
.319 :    4433 [L-HOME]Update. lati:31.8839296 longti:34.9578232 alti:117.70
.320 :    4433 [L-FMU/FSM]state changed. cur: on ground
.323 :    4433 [L-NS][AHRS] reset baro just after land
.325 :    4433 [L-FMU/FSM]state changed. cur: in air
.330 :    4433 [L-FMU/FSM]state changed. cur: on ground
.333 :    4433 [L-NS][AHRS] reset baro just after land
.335 :    4433 [L-FMU/FSM]state changed. cur: in air
.340 :    4434 [L-FMU/FSM]state changed. cur: on ground
.343 :    4434 [L-NS][AHRS] reset baro just after land
.345 :    4434 [L-FMU/FSM]state changed. cur: in air
.350 :    4434 [L-FMU/FSM]state changed. cur: on ground
.353 :    4434 [L-NS][AHRS] reset baro just after land
.355 :    4434 [L-FMU/FSM]state changed. cur: in air
.360 :    4435 [L-FMU/FSM]state changed. cur: on ground
.363 :    4435 [L-NS][AHRS] reset baro just after land
.365 :    4435 [L-FMU/FSM]state changed. cur: in air
.370 :    4435 [L-FMU/FSM]state changed. cur: on ground
.373 :    4435 [L-NS][AHRS] reset baro just after land
.375 :    4435 [L-FMU/FSM]state changed. cur: in air
.380 :    4436 [L-FMU/FSM]state changed. cur: on ground
.383 :    4436 [L-NS][AHRS] reset baro just after land
.385 :    4436 [L-FMU/FSM]state changed. cur: in air
.390 :    4436 [L-FMU/FSM]state changed. cur: on ground
.393 :    4436 [L-NS][AHRS] reset baro just after land
.395 :    4436 [L-FMU/FSM]state changed. cur: in air
.400 :    4437 [L-FMU/FSM]state changed. cur: on ground
.403 :    4437 [L-NS][AHRS] reset baro just after land
.405 :    4437 [L-FMU/FSM]state changed. cur: in air
.410 :    4437 [L-FMU/FSM]state changed. cur: on ground
.413 :    4437 [L-NS][AHRS] reset baro just after land
.415 :    4437 [L-FMU/FSM]state changed. cur: in air
.420 :    4438 [L-FMU/FSM]state changed. cur: on ground
.423 :    4438 [L-NS][AHRS] reset baro just after land
.425 :    4438 [L-FMU/FSM]state changed. cur: in air
.430 :    4438 [L-FMU/FSM]state changed. cur: on ground
.433 :    4438 [L-NS][AHRS] reset baro just after land
.435 :    4438 [L-FMU/FSM]state changed. cur: in air
.440 :    4439 [L-FMU/FSM]state changed. cur: on ground
.443 :    4439 [L-NS][AHRS] reset baro just after land
.445 :    4439 [L-FMU/FSM]state changed. cur: in air
.450 :    4439 [L-FMU/FSM]state changed. cur: on ground
.453 :    4439 [L-NS][AHRS] reset baro just after land
.579 :    4446 [L-FMU/LED]action changed. set home0)
.634 :    4448 [L-FMU/FSM]state changed. cur: in air
.639 :    4449 [L-FMU/FSM]state changed. cur: on ground
.642 :    4449 [L-NS][AHRS] reset baro just after land
.644 :    4449 [L-FMU/FSM]state changed. cur: in air
.649 :    4449 [L-FMU/FSM]state changed. cur: on ground
.652 :    4449 [L-NS][AHRS] reset baro just after land
.654 :    4449 [L-FMU/FSM]state changed. cur: in air
.659 :    4450 [L-FMU/FSM]state changed. cur: on ground
.662 :    4450 [L-NS][AHRS] reset baro just after land
1.113 :    4472 [L-FMU/FSM]state changed. cur: in air
1.118 :    4473 [L-FMU/FSM]state changed. cur: on ground
1.121 :    4473 [L-NS][AHRS] reset baro just after land
1.123 :    4473 [L-FMU/FSM]state changed. cur: in air
1.128 :    4473 [L-FMU/FSM]state changed. cur: on ground
1.131 :    4473 [L-NS][AHRS] reset baro just after land
1.133 :    4473 [L-FMU/FSM]state changed. cur: in air
1.138 :    4474 [L-FMU/FSM]state changed. cur: on ground
1.141 :    4474 [L-NS][AHRS] reset baro just after land
1.143 :    4474 [L-FMU/FSM]state changed. cur: in air
1.148 :    4474 [L-FMU/FSM]state changed. cur: on ground
1.151 :    4474 [L-NS][AHRS] reset baro just after land
1.153 :    4474 [L-FMU/FSM]state changed. cur: in air
1.158 :    4475 [L-FMU/FSM]state changed. cur: on ground
1.161 :    4475 [L-NS][AHRS] reset baro just after land
1.163 :    4475 [L-FMU/FSM]state changed. cur: in air
1.168 :    4475 [L-FMU/FSM]state changed. cur: on ground
1.171 :    4475 [L-NS][AHRS] reset baro just after land
1.173 :    4475 [L-FMU/FSM]state changed. cur: in air
1.178 :    4476 [L-FMU/FSM]state changed. cur: on ground
1.181 :    4476 [L-NS][AHRS] reset baro just after land
1.183 :    4476 [L-FMU/FSM]state changed. cur: in air
1.188 :    4476 [L-FMU/FSM]state changed. cur: on ground
1.191 :    4476 [L-NS][AHRS] reset baro just after land
1.193 :    4476 [L-FMU/FSM]state changed. cur: in air
1.198 :    4477 [L-FMU/FSM]state changed. cur: on ground
1.201 :    4477 [L-NS][AHRS] reset baro just after land
1.203 :    4477 [L-FMU/FSM]state changed. cur: in air
1.208 :    4477 [L-FMU/FSM]state changed. cur: on ground
1.211 :    4477 [L-NS][AHRS] reset baro just after land
1.213 :    4477 [L-FMU/FSM]state changed. cur: in air
1.218 :    4478 [L-FMU/FSM]state changed. cur: on ground
1.221 :    4478 [L-NS][AHRS] reset baro just after land
1.223 :    4478 [L-FMU/FSM]state changed. cur: in air
1.228 :    4478 [L-FMU/FSM]state changed. cur: on ground
1.231 :    4478 [L-NS][AHRS] reset baro just after land
1.233 :    4478 [L-FMU/FSM]state changed. cur: in air
1.238 :    4479 [L-FMU/FSM]state changed. cur: on ground
1.241 :    4479 [L-NS][AHRS] reset baro just after land
1.243 :    4479 [L-FMU/FSM]state changed. cur: in air
1.248 :    4479 [L-FMU/FSM]state changed. cur: on ground
1.251 :    4479 [L-NS][AHRS] reset baro just after land
1.253 :    4479 [L-FMU/FSM]state changed. cur: in air
1.258 :    4480 [L-FMU/FSM]state changed. cur: on ground
1.261 :    4480 [L-NS][AHRS] reset baro just after land
1.490 :    4491 [L-N_MIS]Exit mis 4. New mis 6
1.490 :    4491 [L-N_MIS]Switch new mis 6 req 6 from mis 4 req 6
1.537 :    4494 [L-FMU/FSM]state changed. cur: in air
1.542 :    4494 [L-FMU/FSM]state changed. cur: on ground
1.545 :    4494 [L-NS][AHRS] reset baro just after land
1.550 :    4494 [L-N_MIS]req abort all for reach target height
1.555 :    4494 [L-TAKEOFF]exit auto takeoff plan!
1.560 :    4495 [L-N_MIS]Switch new mis 3 req 2 from mis 26 req 16
1.560 :    4495 [L-FLYMODE]SWITCH2HOVER!
1.971 :    4515 [L-FMU/FSM]not near ground
2.116 :    4523 [L-FMU/FSM]near ground
2.673 :    4551 [L-FMU/LED]action changed. Normal Flash(0)
2.673 :    4551 [L-FMU/LED]type:0, normal flash action:
2.673 :    4551 [L-FMU/LED]c0:0,15;c1:0,3;c2:0,13;c3:2,3;c4:0,10;c5:0,3;c6:0,10;c7:0,3
4.604 :    4647 [L-FMU/FSM]state changed. cur: in air
4.609 :    4648 [L-FMU/FSM]state changed. cur: on ground
4.612 :    4648 [L-NS][AHRS] reset baro just after land
4.614 :    4648 [L-FMU/FSM]state changed. cur: in air
5.407 :    4688 [L-FMU/FSM]not near ground
5.557 :    4695 [L-FMU/FSM]near ground
6.110 :    4723 [L-FMU/FSM]not near ground
6.250 :    4730 [L-FMU/FSM]near ground
6.554 :    4745 [L-FMU/FSM]not near ground
6.704 :    4753 [L-FMU/FSM]near ground
7.521 :    4794 [L-FDI][sensor_api_info] head(2,0,31,4).|
7.604 :    4798 [L-NS][AHRS] reset baro just after takeoff
7.930 :    4814 [L-FMU/FSM]not near ground
7.939 :    4815 [L-FMU/MOTOR]safe_near_grd:false
19.011 :    5370 [L-CTRL]Plant gain uncer comp: SUCCESS, comp gain: 1.000000
23.480 :    5594 [L-FDI][sensor_api_info] head(2,0,31,4).|
35.506 :    6196 [L-NS][AHRS],qg obv buffer size[218/270]
35.506 :    6196 [L-NS][AHRS],pva obv buffer size[238/270]
39.438 :    6394 [L-FDI][sensor_api_info] head(2,0,31,4).|
39.577 :    6400 [L-BATTERY]get_cell_voltage_callback_ack failed!||
52.706 :    7059 [L-CFG]PM:[Mobile APP] "user_avoid_enable" to 0||
55.397 :    7194 [L-FDI][sensor_api_info] head(2,0,31,4).|
58.628 :    7356 [L-CFG]PM:[Mobile APP] "vps_func_en" to 0||
58.651 :    7357 [L-NS][AHRS]  fs_vodm_hp        :  0
58.651 :    7357 [L-NS][AHRS]  fs_vodm_hv        :  0
58.651 :    7357 [L-NS][AHRS]  fs_vodm_vp        :  0
58.651 :    7357 [L-NS][AHRS]  fs_vodm_vv        :  0
58.651 :    7357 [L-NS][AHRS]  fs_vodm_vh        :  0
58.651 :    7357 [L-NS][AHRS]  fs_usnc_vp        :  0
61.177 :    7483 [L-CFG]PM:[Mobile APP] "avoid_enable" to 0||
71.358 :    7994 [L-FDI][sensor_api_info] head(2,0,31,4).|
78.629 :    8358 [L-NS][comm] ext ns disconnect2
78.675 :    8361 [L-FDI]NS(0) FUSION(1): fault on , disconnect
78.675 :    8361 [L-FDI]ns req:fdi,1to0,reason:imu.disconnect,result:succeed
78.675 :    8361 [L-FMU/DM]Busy Device Changed. Type:imu0_local, <ID:17 idx:1-->ID:8 idx:0>, change tim

Hi, just my 2 bob's worth
a) Did you clean the electrical contacts on the batteries and the MA?
b) Do you swap batteries without turning them off?
c) Do you store the batteries & MA in a dry place?
d) Is the cooling fan running freely?
e) Do you operate over MA's temperature limits 40°C/100°F
f) Is it maybe a USB cable or port problem? (you can clean these too)
g) When you say disconnected do you mean out of control or do you get a blank screen?

Hello there. I am sorry to know that you are having issues with your DJI Mavic Air. Kindly please try the troubleshooting steps posted by heliaetus on post #6. In addition can you please try to charge the DJI Mavic Air intelligent flight battery full, then discharge the said battery below to 5%, then charge it full again tio see if the issue will still persist. Thank you and fly safe always.

I found some interesting consistent pattern: https://forum.dji.com/forum.php?mod=viewthread&tid=219239