Efest Luc V6 can be used as a power bank, and it has a digital LCD screen displaying charge and voltage for its 6-bay battery status. Accepts 18650 and 26650, flattop 20700 but not 21700. Adjustable charge amps allow 2A charging for two bays or 0.68A for three or more. Best as an 18650 charger, but it can do more.
Specifications
Modern design with HD LCD screen
Auto detects battery status and selects appropriate charging mode
Minute parameters displayed (current, voltage, and output)