Patent ID: 7724145

Claim:
A Radio Frequency Identification (RFID) device, comprising: a rechargeable solid state battery; control circuitry coupled to the rechargeable solid state battery; a power source for recharging the rechargeable solid state battery; and a primary battery; and a first regulator and a second regulator coupled to the power source, the first regulator regulating a voltage on a line coupled to the rechargeable solid state battery, the second regulator regulating a voltage on a line coupled to a control circuitry, wherein the control circuitry is able to selectively draw power from the rechargeable solid state battery and not the primary battery, wherein if a voltage produced by the supplemental power source is greater than the voltage output from the first regulator, the supplemental power source primarily charges the rechargeable battery, wherein if the voltage produced by the supplemental power source is less than the voltage from the first regulator, energy from the first regulator is used to recharge the rechargeable battery.