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...