Being blind and being way to over dependent on my iPhone, I ran in to a situation yesterday that we have all run in to. I was out and about and my battery was dying as I had not charged it, so I had to pick and choose what I used my value battery time on. I have seen a lot of these solar battery packs for the iPhone, does anyone make use of one, and if so how does it work? I don't want to have to carry around an extra battery, and I am not even sure how I would change the battery on the iPhone. I am using an iPhone 4s so would love to hear if someone has some good advice on something that clips on to the phone? Additionally with these solar chargers, does it charge the phone if you are indoors or do you need to be outside in direct sunlight? I have not looked in to any of these chargers yet, and thought AppleVis would be a good first step. Thanks.