Battery life cycle management is facilitated with distinct visual cues of colors and color-coded combinations. The color-codes enable battery types and characteristics over the course of the life of the battery to be determined. The color-codes are based on a color system that indicates a performance rating of the batteries. A system for managing the color-coded batteries selects color-coded batteries for use based upon color, maintaining color based functionality, and color-coded battery indication for destruction of the battery at the end of its life cycle.

This application relates to a charging method. In one example, a first terminal device includes a battery, a first switched-capacitor circuit, and a wired charging interface. The first switched-capacitor circuit is electrically connected between the battery and the wired charging interface. The wired charging interface is connected to a second terminal device through an on-the-go (OTG) data cable. The method includes: in response to a user selecting a reverse charging mode of the first terminal device, determining that the first terminal device is a primary device that is in an OTG connection and that is configured to provide electric energy; and controlling the first switched-capacitor circuit to increase a first output voltage of the battery to a second output voltage and output the second output voltage to the wired charging interface, to transmit the second output voltage to the second terminal device through the OTG data cable.