Battery life is a major concern for most entries in the fledgling smartwatch category, and around this time last year The Verge heard that Apple was having similar issues with its much-anticipated entry. According to the Times sources, Apple is considering equipping the smartwatchs screen with a solar-charging layer that would top up the battery when the device is worn in daylight, though such a solution is considered years from becoming a reality. Apple is yet to introduce wireless charging to the iPhone The Times report repeats the newspapers year-old claim that the watch will use a curved glass screen, and one anonymous source says that Apple has been testing wireless charging for the device.