DIY Power Bank

Overview

The TP4056 charges the cell safely from USB, the MT3608 boosts 3.7 V up to a steady 5 V, and a switch isolates the port when not in use.

Build Steps

1. 1

   Wire the charger

   Battery to the TP4056's B+ and B− pads, USB input on the other side; use the protected board version.

2. 2

   Set the boost output

   Set the MT3608 to exactly 5.0 V with nothing connected before attaching the phone port.

3. 3

   Connect the output

   Boost output through the slide switch to the USB-A socket; keep the wiring short and thick.

4. 4

   Box it up

   Mount everything in a small project box with a vent-free layout; never puncture or short the cell.