Make your own backup battery and recharge it with the sun! This is an upgrade project to our original Solar Charging Handbag and uses a PowerBoost 500 Basic, a solar lipoly charger, slide switch, and 2000mAh rechargeable battery, all housed in a 3D printed enclosure.

Before you begin, read through the following guides:

USB, DC & Solar Lipoly Charger
Adafruit PowerBoost 500 Basic”

Link