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AIO's power supply to DJI air unit is broken. Can I supply power directly from battery 4s with a safe flight?


Well-Known Member
Aug 23, 2020
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Hi, I have a question about AIO.

AIO's power supply to airunit is broken somehow. In other words, every other wirings are fine like motors, transmitters, buzzer, LED. Even Airunit's RX-TX wires seem to work by an electric inspector.
In fact, I tested to connect 4s battery to airunit directly without AIO board and DJI goggles shows vision well.
Then, how dangerous/safe to fly it with the direct wiring like the screen capture? I am afraid airunit could be burned or the AIO might catch smoke/fire during flight, But because battery is 4s, I hope to fly the drone well.

Here are the specs for the Air Unit

According to the input power, it will take up to 17.6 volts , but I would still recommend adding a capacitor direct on the VBAT connections to prevent any unwanted voltage spikes. Therefor, you are good to go with 4S and smaller, but I would not use anything more than a 4S.

DJI FPV Air Unit​

WeightAir Unit (Camera included): 45.8 g
3.9 g (MMCX elbow antenna each)
DimensionsAir Unit: 44×37.8×14.4 mm
Camera: 27.4×21.1×20.1 mm
Coaxial Cable: 100 mm
Operating Frequency5.725-5.850 GHz
Transmitter Power (EIRP)FCC/SRRC/MIC: <30 dBm;
CE: <14 dBm
Min. Latency (end-to-end)Low Latency Mode (720p/120fps): <28 ms
High-Quality Mode (720p/60fps): <40 ms
Max. Transmission DistanceFCC/SRRC: <4 km;
CE: <0.7 km;
MIC: <2.5km
Video FormatMP4 (Video format: H.264; Audio format: ACC-LC)
I/O Interface USB-C, MMCX, 3-in-1 port, microSD card slot
Supported Flight Control SystemThe DJI FPV Air Unit is only compatible with flight controllers that support Betaflight
Operating Temperature Range32° to 104°F (0° to 40°C)
Input Power7.4-17.6 V, about 4-9 W
Channels infoFCC
Channel 1: 5660
Channel 2: 5695
Channel 3: 5735
Channel 4: 5770
Channel 5: 5805
Channel 6: 5878
Channel 7: 5914
Channel 8: 5839

Channel 1: 5735
Channel 2: 5770
Channel 3: 5805
Channel 8: 5839

Channel 1: 5660
Channel 2: 5700
Channel 8: 5745
Thanks, SpeedBump. Yes, that's true, and I was afraid about spikes of current and voltage. My solution is to insert secondary ceramic capacitor right before airunit. Hopefully Airunit won't get unexpecting power.
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