Green Renewable Energy Solar Battery charger for iPhone or iPad
You can charge your iPhone using 4 x 1.25V rechargeable batteries. These rechargeable batteries can be charged through the Solar panel. The rating of the Solar panel is 6V, 200mA. You can use this for emergency when you are out in the field when there is no power socket available. Solar panel cost around US$10, Battery holder cost about US$1.5, iPhone cable cost about US$2.