I really wanted a reliable solar device that i could carry around and charge my iPhone if I needed a quick source of power. As a portable battery it works great. As a solar charger, it leaves much to be desired. I did not realize this when I bought it, but it takes 5 days in full sun to charge the internal battery. If there are clouds, you will likely never charge the battery. I have resorted to simply charging it from my home computer. Given the price, the promises, and the desired functionality, I'd recommend spending the extra bucks to get the real thing, the solo solar chargers.