solar charging units, cars fitted with solar cells, and charging units capable of harnessing even ambient light, things are looking good for the solar power industry. And thats... all without even mentioning that in several places, solar power is becoming cheaper to produce than some fossil fuels. So with all these exciting technologies growing on the market.... But theres one advantage those phones of yesteryear had over the incredible handheld devices of today: battery life! And its not even close either! Once upon a time, a cell phone...