Abstract: A battery includes integrated circuitry. The battery may include, for example, a substrate with a battery cell including an anode and a cathode. One or more electrical devices may be integrated on or within the substrate and configured to receive power from the anode and cathode. A package containing the substrate and the one or more electrical devices may include a first battery terminal electrically coupled to the anode and a second battery terminal electrically coupled to the cathode. The one or more electrical devices may include sensing circuitry to generate sensor data, and communication circuitry to provide the sensor data external to the package.