USB Charging

USB Battery Charging

USB Battery Charging 1.2 defines charging-port detection and behavior for legacy and mixed-generation USB charging hardware.

Characteristics

Common revision	USB Battery Charging 1.2
Primary purpose	Identify charging-capable USB ports and define charging behavior
Common era	Widely associated with USB-A, USB 2.0, and Micro-USB charging hardware
Detection	Uses charging-port detection rules associated with the USB data lines
Standard Downstream Port	Ordinary USB host or hub downstream port with USB data
Charging Downstream Port	USB downstream port supporting data and enhanced charging behavior
Dedicated Charging Port	Charging-focused port without ordinary USB data communication
USB Power Delivery	Separate specification; the two technologies can coexist in supported implementations
Current relevance	Still useful for compatibility with legacy and mixed-generation USB charging equipment