How can a battery bank at 10% charge a phone at 90%

Question

How can a battery bank at 10% charge a phone at 90%

In: 0

Answer 1

The battery bank has a switching converter to bump up the voltage from the internal batteries to 5V to charge your phone. That way the power flow is only one direction from the battery bank to the phone.

It’s not directly hooking up the possibly lower voltage battery.