Sony's "smart" lithium rechargeable battery pack. It has a chip inside that tells the camera how long (in minutes) it will last at the current discharge rate.

InfoLithium is a battery pack made by Sony that has a chip inside that tells you how many minutes you have before your battery dies, if you continue to use it at the current rate of discharge.

Battery technology that displays remaining charge and precise remaining recording time in minutes on the viewfinder or LCD screen.