Patent ID: 8860420

Claim:
An electronic device comprising: an interface for receiving a battery comprising a battery module for supplying power to the electronic device; and a power management module coupled to the battery and configured to: measure an electromagnetic radiation spectrum of the battery due to current flow in the battery module; compare the measured electromagnetic radiation spectrum of the battery to at least one of a plurality of reference electromagnetic radiation spectrums, each of the reference electromagnetic radiation spectrums corresponding with a different relative condition; determine a relative condition of the battery by comparing the measured electromagnetic radiation spectrum with one of the plurality of reference electromagnetic radiation spectrums; store, in a memory store, data identifying the relative condition of the battery; repeat measuring the electromagnetic radiation spectrum, comparing the electromagnetic radiation spectrum, and determining the relative condition of the battery at a second time such that a second relative condition of the battery is determined; compare the second relative condition of the battery with the relative condition of the battery previously stored in the memory store; determine a rate of change between the second relative condition of the battery and the relative condition of the battery previously stored in the memory store; and determine if the rate of change exceeds a threshold tolerance level.