Instructions strip your old phone usb charger and retrieve the usb charger circuit inside.
How to build a mini solar panel.
Then grease and solder your cells together to create a circuit.
To start cut the plastic sheets into squares the size of your solar panel cells.
Solder charger circuit to the solar panel.
To make a small solar panel using store bought micro cells you ll need thin plastic sheets for backing a flux pen super glue 2 part epoxy and a charge controller with a rechargeable battery.
Small solar panel step 1.