"The Clip on and Tag Along Solar Battery with USB port for your Smartphone.. It allows you to charge your phone or any gadgets quickly as it works on inbuilt Li-Polymer battery similar to the batteries found in mobile phones. It continually stores sunlight to the inbuilt battery when exposed to sunlight. It then keeps this stored power ready to charge your phone or gadgets. his cycle continues every time it is exposed to sunlight.
With summer finally arriving, now is the time to invest in solar chargers for all your gadgets. However Joshua Zimmerman of DIY site Instructables doesn't think you need to spend money at all and has designed a simple do-it-yourself solar USB charger that fits in an Altoid tin!