Why don't smartphones have a built-in solar charger? There is plenty of surface area on the back of the phone and even the screen itself could be used. - Quora
![What are the Benefits of Solar Powered Cell Phone Chargers? - News about Energy Storage, Batteries, Climate Change and the Environment What are the Benefits of Solar Powered Cell Phone Chargers? - News about Energy Storage, Batteries, Climate Change and the Environment](http://blog.upsbatterycenter.com/wp-content/uploads/2014/09/image_title_bledk.jpg)
What are the Benefits of Solar Powered Cell Phone Chargers? - News about Energy Storage, Batteries, Climate Change and the Environment
![Riapow Solar Power Bank 26800mAh - USB C Portable Solar Charger Fast Charging External Backup Battery Pack with 3 Outputs & 60 LED Lights for Cell Phone Tablets Android : Amazon.co.uk: Electronics Riapow Solar Power Bank 26800mAh - USB C Portable Solar Charger Fast Charging External Backup Battery Pack with 3 Outputs & 60 LED Lights for Cell Phone Tablets Android : Amazon.co.uk: Electronics](https://m.media-amazon.com/images/I/71Z9rv5JUJL._AC_UF894,1000_QL80_.jpg)