I ran into an issue with my USB battery packs turning off if the current draw wasn’t high enough.
I solved this by testing the current draw of all my bits using my DROK USB meter, and found that 60mA is enough to keep the pack on!
Example bits needed: USB(10mA) + two RGB LEDs set to white (30mA each),
or USB(10mA) +Bargraph (40mA) +Led (10mA).
Here’s the full table of my readings so far (max resolution of my meter: 10mA).
I’ll keep adding more bits as I acquire them.