I want to use an 18650 battery pack to power a circuit with 5 volts at a low current. The 18650 battery pack has a USB output which provides 1 amp at 5 volts. I measure voltage drop across the left and right pins and it’s only .77 volts. When I plug in a device like a phone, it goes to 5 volts and a light turns on on the charger board.
How can I get power without talking to the charger board?
Ok actually I solved my own issue through dumb luck. I plugged it in and it turns out my clumsy self had shorted the usb shield to positive and it tripped protection until it was plugged into the charger. Now everything is working great @5 volts 300mA (I’m powering 4 hall sensors).