Patent ID: 9665152
Date: 2017-05-30
CPC Classifications: G06F,G06K

Claim:
1. A method comprising: interrogating a radio-frequency identification (RFID) tag of a mobile device from a RFID reader; determining that the mobile device is powered on based on the RFID tag not responding to the interrogation from the RFID reader, an antenna of the RFID tag being disabled when the mobile device is powered-up; determining that the mobile device is powered off based on the RFID tag responding to the interrogation from the RFID reader, the antenna of the RFID tag being enabled when the mobile device is powered-down; determining a battery level of a battery in the mobile device while the mobile device is said powered-down; and storing an indication of the battery level in a memory of the RFID tag while the mobile device is said powered-down.