So does that mean my powerbank isn't QC 2.0? Or G4 isn't? Anyone has screenshots for the voltage being more that 5v?
QC2 won't kick in if charging above 50%. Please take another reading when charging between 0-50%. Anything above 50 or 60% will only trigger the fast charging not quick charging.
In addition, Anker 36W 4-Port USB Wall Charger Travel Adapter with PowerIQ Technology will only give you fast charging, not quick charging.

