Black and Decker power tool battery talks to your smartphone
 

When you're using power tools to complete a big project, battery life is a big problem. You probably don't want to find out you need a battery swap when you're in the middle of drilling. Thankfully, Black and Decker has a way to give you a heads-up:...

http://www.engadget.com/2016/01/06/b...-tool-battery/