4. Now that you’ve assembled all the soldered components, the next to last step is
to attach and plug in the battery. Use an adhesive method of your choice (double
sided tape, glue, velcro, etc.) to mount the battery centered to the battery
rectangle on the side opposite the Pro Trinket. Make sure the wires are facing
towards the charger. The image below shows an Alpha Tinker Tie with the
battery mounted but not plugged in. Once your battery is attached, plug the
battery’s JST connector into the port on the charging board.