Battery as a Service

I have a dream !  one day you pay for battery as a service. (or B.a.S) no matter what your device is, you go to a place (like a gas station) and they swap your dying battery with a fully charged one.

So you never spend time charging anything. just spend time swapping batteries. and those who do charging the battery would do it in the most efficient way.

And that would be true for any thing with a battery, Cars, Drill, Tire Inflator, Car Jump Start, Flashlight, Bluetooth speakers, Laptops... wouldn't be nice if all of them had a USB "input" and "output" so you can charge any of them with the other one's charger or... and in case of emergency can draw power from any of them?

Just a thought...

P.S: Thats one of the reasons I have stayed loyal to my LG phone and haven't switched to Google's Nexus. LG respects my wish to be able to swap my batteries.