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DJI Air 3 Charging Question

That's NOT correct !

You HAVE to take the voltage in consideration and convert the capacity to Wh.
Air 3: 4241mAh at 14,76V equals 62.6Wh
Powerbank: 40.000mAh at 3.7V equals 148Wh
Number of charges: 2, NOT 9

Besides that, the powerbank you mentioned before is only 20.000mAh at most.

FACT:
The energy density of LiPo batteries ranges from 140 - 200 Wh/kg in terms of weight and 250 - 350 Wh/l for volume.

Your powerbank weigh 0.43kg, it's volume is 1.46x0.73x0.31=0.33l
Assuming it contains the most dense (and most expensive) LiPo, it's capacity is at most:
Weight: 0.43x200=86Wh (23.000mAh)
Volume: 0.33x350=115Wh (31.000mAh)
Maybe you can share the formula for the setup I’m trying (just ordered this powerbank, and new hub). Hoping to be able to recharge a battery at least 4 or maybe 5 times (worst case 3x). With 3 batteries, that will keep me flying for more time than I’ll ever want to spend in the air in a day. I’m sure a power station has more capacity, but this 50KmAH power bank weighs just 2.6lbs and offers 100w output via USB-C and cost me around $40. Amazon.com
 

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Maybe you can share the formula for the setup I’m trying
200W 2x fast charging Air 3 battery charger.
The hub can only charge 2 batteries at once when both (2) inputs are used.
The mentioned powerbank only has 1 USB-C PD output.
It clearly states: Maximum charging power per battery: 80W
That's the same as the standard DJI Hub.

ZKpilse 100W Portable charger power bank
50Ah x 3.7V x 75% (efficiency) = 140Wh
Air 3 battery depleted to 10%: 63Wh x 0.9 = 57Wh
140 / 57 = 2.4
You can charge an Air 3 battery with 10% charge left 2.4 times.
 
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200W 2x fast charging Air 3 battery charger.
The hub can only charge 2 batteries at once when both (2) inputs are used.
The mentioned powerbank only has 1 USB-C PD output.
It clearly states: Maximum charging power per battery: 80W
That's the same as the standard DJI Hub.

ZKpilse 100W Portable charger power bank
50Ah x 3.7V x 75% (efficiency) = 140Wh
Air 3 battery depleted to 10%: 63Wh x 0.9 = 57Wh
140 / 57 = 2.4
You can charge an Air 3 battery with 10% charge left 2.4 times.
Thanks - only actually would want to charge 1 battery at time with power bank - thinking could re-charge one up while flying with one of other two charged batts. Since I rarely fly beyond 20% remaining I should be able to squeeze 3 charge ups from this setup. Worth it for a $40 power bank. The new charge hub was needed since the standard DJI hub would take charge from air3 battery and dump into power bank rather than from power bank to air3 battery.
 
The new charge hub was needed since the standard DJI hub would take charge from air3 battery and dump into power bank rather than from power bank to air3 battery.
I don't think that is due to the DJI Hub, but rather due to the power bank or user error.
You have to force the DJI hub into power bank mode by pressing the function button.
(User Guide: DJI Air 3 - Downloads - DJI)

I would like to hear the outcome if you could test this with the new power bank.
 
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I don't think that is due to the DJI Hub, but rather due to the power bank or user error.
You have to force the DJI hub into power bank mode by pressing the function button.
(User Guide: DJI Air 3 - Downloads - DJI)

I would like to hear the outcome if you could test this with the new power bank.
Don’t believe user error - other strings in the forum with no clear answer why the Air3 hub won’t prevent charge from reversing direction. I’ll look at link you sent, but have been searching for answer the last year, without success (maybe this has changed - if so I’ll return the new hub).
 
Thanks - only actually would want to charge 1 battery at time with power bank - thinking could re-charge one up while flying with one of other two charged batts. Since I rarely fly beyond 20% remaining I should be able to squeeze 3 charge ups from this setup. Worth it for a $40 power bank. The new charge hub was needed since the standard DJI hub would take charge from air3 battery and dump into power bank rather than from power bank to air3 battery.
I looked up your power bank and it's not clear whether it truly supports the PD fast charging standard. The information on the item is ambiguous which is common on lower cost banks from China. If this is not a PD power bank then it will not be practical in the field because the charge times would be tremendously long. Let us know how this set up works for you.
 
I looked up your power bank and it's not clear whether it truly supports the PD fast charging standard. The information on the item is ambiguous which is common on lower cost banks from China. If this is not a PD power bank then it will not be practical in the field because the charge times would be tremendously long. Let us know how this set up works for you.
PD marked on box and documents inside. Also seems to be charging Air3 battery at 85w (see pics), A3 battery jumped from 61% to 75% in just a few minutes.
 

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Don’t believe user error - other strings in the forum with no clear answer why the Air3 hub won’t prevent charge from reversing direction. I’ll look at link you sent, but have been searching for answer the last year, without success (maybe this has changed - if so I’ll return the new hub).
Got new power bank (PB) and new hub today. Tested using the PB 1st with DJI hub and same result as before - A3 batteries were charging the PB, not the PB charging the A3 batts as I wanted. I then used the new hub and wa-la, PB charging the A3 battery at 85w, so charging quickly. Now I can recharge A3 batts when out (multiple times) with the new 50 mah PB.
 
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