RFID systems comprising rechargeable power source and methods of using the same

A method, comprising:

• receiving a query originating from a portable telephone at a Radio Frequency Identification (RFID) tag operatively coupled to an electrical system of a vehicle;
• and
• transmitting, by control circuitry of the RFID tag, at least an identification number, in response to the query;
• wherein the RFID tag directly controls access to the vehicle via the operative coupling to the electrical system of the vehicle;
• wherein the RFID tag includes a first power source for providing power to the control circuitry;
• wherein the RFID tag includes a secondary power source physically coupled to the first power source for recharging the first power source;
• wherein the RFID tag includes a memory for storing information including the identification number.

A Radio Frequency Identification (RFID) tag, comprising:

• a housing configured for coupling to a vehicle;
• control circuitry coupled to the housing and operatively coupled to an electrical system of the vehicle;
• a first power source for providing power to the control circuitry;
• a secondary power source physically coupled to the first power source for recharging the first power source;
• and
• a memory for storing information including an identification number;
• where the control circuitry:
• directly controls access to the vehicle via the operative coupling to the electrical system of the vehicle;
• receives a query originating from a portable telephone, and transmits at least the identification number, in response to the query.