Method and apparatus are disclosed for vehicle monitoring of mobile device state-of-charge. An example vehicle includes a communication node, a charging station, and a controller. The controller is to receive, via the communication node, a state-of-charge (SOC) of a mobile device and determine a predicted SOC at a destination based on the SOC, a rate-of-change of the SOC, and a travel time to the destination. The controller also is to emit, responsive to the predicted SOC being less than a threshold, an instruction to couple the mobile device to the charging station.