A loop antenna (100) shares terminals with a thermistor on a battery. The battery (300) has at least two terminals (302 & 304) that connect to a thermistor (514). An electromagnetic wave radiating and receiving element (522) shares the at least two terminals (302 & 304) with the thermistor (514) but is electrically isolated from the thermistor (514) so that the thermistor (514) resistance can be measured while the electromagnetic wave radiating and receiving element (522) can communicate electrical RF signals via the at least two terminals with an RF circuit. A wireless communication device that uses the battery (300) and the loop antenna (100) is also disclosed.