I bought the Solbat2 for my iPhone to use on camping trips, or just in my car on long trips. I'm very pleased that the Solbat2 actually works with my iPhone 3G. Three other solar products I bought from other manufacturers that work with the iPhone turned out NOT to work at all.
However, I'm disappointed with the solar cell on the Solbat. It seems impossible to charge the internal battery using just the sun. I have had the Solbat sitting on my dashboard literally for two weeks or more and it never seems to charge even halfway. I always have to plug it in to a USB port to get a full charge, and then it fully discharges into my iPhone very quickly. In other words, the capacity of the internal battery is a bit low, but the big disappointment is the inability to get more than a fractional charge Solely from the sun (pun intended). This product is much better suited to charge my iPod nano than my iPhone, and a larger or more efficient solar cell is needed. Would I recommend this to others? Yes, considering it's the first reasonably-priced solar charger that actually works at all with my iPhone 3G. Sure wish it had a more robust solar cell, though.