There is provided a battery-operated device that include a battery, an electronic circuitry configured to be powered by the battery, and a converter configured to receive energy from any of a plurality of authorized chargers, and generate power from the energy for charging the battery using the power. The battery-operated device is configured to receive a charger identification from a charger, and determine whether the charger identification is in a list of charger identifications belonging to the plurality of authorized chargers. The battery-operated device is further configured to, in response to determining that the charger identification is in the list of charger identifications receive the energy from the charger, generate, using the converter, the power from the energy received from the charger, charge the battery using the power received from the converter, and use the battery to power the electronic circuitry.