According to the Wall Street Journal Google has a team of researchers creating the batteries powering the CE of the future, including improved lithium-ion batteries and cutting-edge solid-state alternatives.
The four-man team is led by ex-Apple battery expert Dr. Ramesh Bhardwaj, and makes part of the secretive Google X research lab. According to the WSJ Google has "at least" 20 ongoing battery-dependent products, ranging from self-driving cars, wearables and even disease-diagnosing devices.
Particularly relevant to consumer devices are solid-state batteries, which transmit current over a solid thin film, rather than a liquid. This allows for thinner, flexible batteries ideal for small mobile devices-- even if researchers doubt whether the technology can be mass produced cheaply.