Swippitt, a toaster-sized unit, allows users to swap a dead phone battery with a fully charged one within seconds.

If you have physical SIM cards, you can just power down and swap them between phones. Note: You may have to carry both phones around with you for a day or two until the full process is complete.

A "hot swap" is inserting or removing a component of a device while it is operating. "Hot-swappable" indicates an aspect of a device that allows such an operation. In phones, this usually refers ...