You can recharge Anker 733 Power Bank via two charging ways as below:

AC recharging:

• By plugging the 733 Power Bank into the wall outlet directly

USB-C recharging:

• Recharge the 733 Powerbank with an 18W or more USB-C wall charger and included USB C-C cable via its USB-C 1 port.

Notes: 

• The USB-C 2 port of the 733 Powerbank is just an output port, it can’t recharge the 733 Powerbank.

Per our test, it will take about 3 hours to recharge the 733 Powerbank fully via AC port or USB-C 1 port.