Longer-lasting batteries are crucial for a new crop of wearable computers whose rise may upend Apple and Google's dominance of mobile devices. A new report from the New York Times said Apple is trying and experimenting with different technologies to make its products last longer.

Reportedly, Apple may add a solar-charging layer to its much-rumoured smartwatch, which would give power to the device in daylight. The company had, in fact, a few months back, put up a job listing seeking engineers who specialise in solar energy.

Citing a former Apple executive, the report said, "Apple tried for many years to build a smarter battery by adding solar charging to iPhones and iPods. But the method never proved practical...because mobile devices often stay inside pockets when people are outdoors, and indoor artificial light generates only a tiny amount of energy.

If the report is to be believed. Apple, for its much-anticipated smartwatch, has been testing wireless charging too. A similar technology is already used in a few Nokia smartphones wherein you don't need to connect any cables; you just place your device on the charging surface.

It has been observed that Apple in the past has hired engineers with expertise in power technology and battery design from companies like Tesla, Toyota and A123 Systems.

Also, the watch is expected to come with a curved glass screen.
While battery technology has not expanded at the same clip as miniaturisation and displays for instance, some wearables pioneers are hopeful for a breakthrough in coming years.