A vehicle door activation device includes a housing, an activation button connected with the housing to define a first chamber and a second chamber, a back-up battery stored in the first chamber, and a semiconductor chip stored in the second chamber. The semiconductor chip, in response to a voltage supplied to a vehicle door being less than a threshold, causes the back-up battery to supply power to the vehicle door, and, in response to a tag being within a proximity from the semiconductor chip and an actuation of the activation button, causes the vehicle door to unlock.