I am interested in getting an external battery for my iPhone, and soon hopefully my iPad. I've looked at some on Amazon and it seems they're either $50+ or awful. If anyone could give suggestions on some that would be great! They don't need to be from Amazon or anything but more than $50 is a little much for my liking...  I would rather these not be in a case either, so I can use them for an iPad or any other handheld device!