US Patent 9392320 Adaptive battery life enhancer

A peripheral device includes a user interface and a battery. The peripheral device: accepts inputs from a user via the user interface; responsive to the inputs, and communicates with a base device by way of a wireless communication link. During intervals between the inputs, responsive to one or both of a usage characteristic of the user and an operational mode of the base device, the peripheral device adaptively manages power draw from the battery by switching between a normal mode and a power saving mode.