Some do... http://www.extremetech.com/extreme/174477-at-long-last-new-lithium-battery-tech-actually-arrives-on-the-market-and-might-already-be-in-your-smartphon

Some do... http://www.extremetech.com/extreme/174477-at-long-last-new-lithium-battery-tech-actually-arrives-on-the-market-and-might-already-be-in-your-smartphone http://www.extremetech.com/extreme/174477-at-long-last-new-l...