I'm trying to use this small (and awesome?) unit as a boost/step-up converter for my project. I need to give my ESP8266 12-E NodeMCU a 5v input from a 18650 battery. Since this powerbank already had 1x 18650 battery in it, I assumed doing this would be easy. I was wrong.
The circuit looks like this:
On the far right, you can see the micro USB input, which charges the battery (B+ and B-) at 4.2v. In the middle, you can see 4 solder pads. That is a regular female USB connector, which I desoldered.
Here's the weird issue: If I take my battery, which is at 3.8v at the moment, and I check the voltage on the USB in the middle (which would normally charge your phone), it will be at 3.8v as well.
Am I doing something wrong? Shouldn't it be 5v, so it would charge my other devices at 5v? You can see the complete unit here: https://imgur.com/a/7almr