Page 51 of the manual.
"To avoid unnecessary danger caused by insufficient power, the aircraft automatically
calculates if the battery power is sufficient to return to the Home Point according to the
current position, environment, and flight speed. A warning prompt will appear in DJI Fly
when the battery level is low and only enough to complete an RTH flight. The aircraft will
automatically fly to the Home Point if no action is taken after a countdown.................................."
I.e. the drone determines the threshold for low battery RTH and it depends on at least the distance and height of the drone.
I do not know if it can factor in wind and or any required climb to RTH height.
These features, which were present in the earlier GO 4 app, were later removed at some time after the newer Fly app was adopted by DJI. I don't own an Air 3 to know if it ever had them, but I doubt it.
The current battery mAh are also no longer available in the app, as DJI doesn’t want you to know that your batteries are no longer ever fully charged to the published max mAh capacity. Fully charged 5800 mAh batteries are actually only charged to 5600 mAh. Previously, the P4P batteries, rated for 5800 mAh, when new would actually display 6050 mAh in GO 4, and would gradually decline to 5800 mAh over time, and after 30+ charges would settle at around 5500 mAh when fully charged.
Oh okay from reading the post I thought the Air 3 and the Minis had that option too.
I can be wrong about this but I believe AirData provides the actual battery capacity (and compares it to the rated battery capacity) for the battery that was used to fly that particular flight if you upload your flight logs there.
If I’m remembering correctly, they even had a separate “Batteries“ section that could give much more information on the batteries, but that was part of their paid membership so I never had it.
Thanks to all for the feedback. I also called DJI and they pretty much confirmed that those are "baked in" to the firmware now. For me, I always keep an eye on the battery levels and now know that I need to double down on that.
Droning on and on...
Well-Known Member
Excellent post!!
I did want to comment on this, however. You're quite mistaken in the precision with which state-of-charge can be estimated from resting voltage, or even the actual charge that can be extracted from the cell. Even that varies significantly as a function of the discharge current/load.
Every time you go through a charge/discharge cycle, the usable capacity decreases a little. The internal resistance increases. The battery degrades.
As such, it is truly impossible to fully charge a used lipo to 4.35V, and know how much precisely will come back out of it.
Measuring how much charge goes in when charging isn't a solution either... as the battery ages, the internal resistance increases, creating a larger and larger gap between charge in and charge out due to heat losses on both sides (charge, discharge).
It is for these frustrating technical reasons I believe the feature was removed. Basically, it was misleading, and led to the sort of analysis you give above, which isn't actually real.
I did want to comment on this, however. You're quite mistaken in the precision with which state-of-charge can be estimated from resting voltage, or even the actual charge that can be extracted from the cell. Even that varies significantly as a function of the discharge current/load.
Every time you go through a charge/discharge cycle, the usable capacity decreases a little. The internal resistance increases. The battery degrades.
As such, it is truly impossible to fully charge a used lipo to 4.35V, and know how much precisely will come back out of it.
Measuring how much charge goes in when charging isn't a solution either... as the battery ages, the internal resistance increases, creating a larger and larger gap between charge in and charge out due to heat losses on both sides (charge, discharge).
It is for these frustrating technical reasons I believe the feature was removed. Basically, it was misleading, and led to the sort of analysis you give above, which isn't actually real.
MavicKhan
Well-Known Member
Don't know why anyone would want to go back and regain control over those parameters.
As far as I am concerned, the software now does an amazing job at monitoring the charge levels to always guarantee a safe RTH.
This, coupled with the current batteries endurance, means I worry close to zero about power management, while enjoying my drone.
MK
As far as I am concerned, the software now does an amazing job at monitoring the charge levels to always guarantee a safe RTH.
This, coupled with the current batteries endurance, means I worry close to zero about power management, while enjoying my drone.
MK
I try to keep up on it but with RTH as of late 100% of the time saved the day.
I just fly and get into the moment without any worries.
I like it that way ;-)
Thanks to DJI RTH
HTH
PS
I have birds that do have RTH, Not fun
You will have to get closer with signal loss or they just sit in space until you do
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