Very simple to make, a perfect utility tool for DIY hobbyists.
This tool besides a power bank can also be used by plugging in any 5v USB mobile charger.
Step 1: Things You Need
Cable, USB plug, Mini switch, Mini motor, Electrical connector, Small drill
Step 2: Connect the Switch
Step 3: Connect Cable to Motor
Step 4: Connect Cable to USB
Finish it off with tape and shrink tubing,
don't tape the switch!
Step 5: Connect the Drill
Glue the drill and motor together in the connector.