For camping out in the woods, this Freeloader Pico Solar Battery Charger will come in handy. This compact and lightweight device will charge small electronic devices. The battery charger utilizes crystalline solar cell and lithium ion battery technology to collect the sun's rays during the day and charge a phone or GPS at night. In just 30 minutes, the device will be charged. The master power cable and four adapters will fit the Nokia Small Pin, Sony Ericcson, Mini USB devices such as BlackBerry, most smartphones, Garmin and many other GPS units or any device supplied with a USB charger. It's currently available for $39.99.