A partially-actively-powered temperature data logger patch with wireless data communication, comprising: a first substrate layer; a sealed, flexible battery comprising a printed electrochemical cell with an anode and a cathode, at least one of said anode and cathode being formed of a cured or dried ink, and first and second battery electrode contacts (33A, 33B) that are each electrically coupled to one of the anode and cathode; a flexible circuit comprising a microprocessor, a temperature sensor configured to sense a temperature of a target subject, and first and second battery contact pads (35A, 35B) that are each electrically coupled to one of the first and second battery electrode contacts to thereby electrically power the microprocessor and temperature sensor, wherein the microprocessor and the temperature sensor are actively powered by the flexible battery; a second substrate layer comprising an adhesive configured to be removably applied to a surface of the target subject, wherein the first substrate layer, the flexible battery, the flexible circuit, and the second substrate layer (40, 46) define respective layers; and wherein the flexible battery and flexible circuit together define an electronics inlay that is arranged in a covering, stacked arrangement between the first and second substrate layers, and wherein all of the first substrate layer, electronics inlay, and second substrate layer are flexible and configured to conform to a curved surface of the target subject, and wherein a wireless communication transceiver and an antenna are included in the flexible circuit, wherein the wireless communication transceiver is electrically connected to the antenna, the said patch is characterized in that the wireless communication transceiver includes at least one passively-powered communication protocol and one actively-powered communication protocol; the microprocessor is configured to selectively distribute electrical power to the wireless communication transceiver via power lines; where a passively-powered communication protocol is used, the microprocessor is configured to provide no power to the wireless communication transceiver. Instead, the wireless communication transceiver is then configured to obtain all of its power from the passively-powered transmission; andwhere an actively-powered communication protocol is used, the microprocessor is adapted to provide continuous or intermittent power to the wireless communication transceiver for operation thereof. a first substrate layer; a sealed, flexible battery comprising a printed electrochemical cell with an anode and a cathode, at least one of said anode and cathode being formed of a cured or dried ink, and first and second battery electrode contacts (33A, 33B) that are each electrically coupled to one of the anode and cathode; a flexible circuit comprising a microprocessor, a temperature sensor configured to sense a temperature of a target subject, and first and second battery contact pads (35A, 35B) that are each electrically coupled to one of the first and second battery electrode contacts to thereby electrically power the microprocessor and temperature sensor, wherein the microprocessor and the temperature sensor are actively powered by the flexible battery; a second substrate layer comprising an adhesive configured to be removably applied to a surface of the target subject, wherein the first substrate layer, the flexible battery, the flexible circuit, and the second substrate layer (40, 46) define respective layers; and wherein the flexible battery and flexible circuit together define an electronics inlay that is arranged in a covering, stacked arrangement between the first and second substrate layers, and wherein all of the first substrate layer, electronics inlay, and second substrate layer are flexible and configured to conform to a curved surface of the target subject, and wherein a wireless communication transceiver and an antenna are included in the flexible circuit, wherein the wireless communication transceiver is electrically connected to the antenna, the said patch is characterized in that the wireless communication transceiver includes at least one passively-powered communication protocol and one actively-powered communication protocol; the microprocessor is configured to selectively distribute electrical power to the wireless communication transceiver via power lines; where a passively-powered communication protocol is used, the microprocessor is configured to provide no power to the wireless communication transceiver. Instead, the wireless communication transceiver is then configured to obtain all of its power from the passively-powered transmission; andwhere an actively-powered communication protocol is used, the microprocessor is adapted to provide continuous or intermittent power to the wireless communication transceiver for operation thereof.