I agree, its well worth having, my only mild niggle it can charge on storage mode (stops at 62%) but won’t auto discharge down to 62%.
Adrian
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On the subject of those 737 powerbanks. 2 of them will charge 3x air 3 batteries from storage charge 60% to 100% using one of these chargers and they lose 20-25% from each power bank doing so. So theres some maths for you to do. Nice charger at 200 watts total and bluetooth which I thought would be a gimmick but is actually really handy for monitoring.
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I do like a person who labels everything, good job 
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Certainly looks the part 
Is it this one John @UAVShipSpotter ?
https://www.amazon.co.uk/LIMETA-Intelligent-3-Channel-Discharge-Batteries/dp/B0CTK9ZJHX/
Yeh that one. Im still testing it but happy with it so far after a couple of trips.
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Ive done some rough testing because i never worked this out either. Results may vary if outside, tests done in my warm office using a power bank with 34 charge cycles on it.
Mini 3 pro battery with 43 cycles, charges 20% to 100% while consuming exactly 20% of the 737 power bank, this was in the Yuanley aftermarket charger in fast mode.
I then charged a second Mini 3 pro battery with 42 cycles, again 20% to 100% which consumed the next 22% of the 737 powerbank with the DJI fly more charger hub.
Some sort of increased losses as you go deeper into the capacity of the power bank? Maybe someone thats more of an expert in batteries would know because it doesnt make sense the more basic charger consumes more power without a bright screen lit up the whole time. Or the screen just isnt that accurate. 1 and a bit watts extra used when the battery is full just to keep that screen on.
Id say if youre not landing in the yellow or red then you can make a rule of thumb that this power bank will charge ~5 mini batteries on a warm ish day. Youre flying all that extra time for the cost of 1.5 additional drone batteries. But at some point depending how much you leave the controller on standby you may need to account for putting some charge into that too.
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