Invension

I propose the light smart phone which can be charged with solar energy as invention. There are many people who are not satisfied with the battery of smart phones. And I am one of those people. Although the smart phone is very useful, we can't use smart phones in a day that we use much. But probably, battery whose electric power is not lost all the time is not a battery any longer. So, that the smart phone using the battery which can always charge electric power by few solar energy is used is very good, I think. Even so, a heavy smart phone is not good, so I hope that a smart phone which has a solar charge function and is so light will be invented. I think that this is not so unreal.