A data reading system for predicting the removal of a data reader from a charging base unit based on the approach of a user's hand. The data reading system includes a data reader with a power supply, a base unit configured to receive the data reader and to charge the power supply of the data reader responsive to the data reader being coupled to the base unit, a sensor configured to detect the approach of a user's hand, and a processor in operable communication with the sensor and the data reader or the base unit. The processor is configured to apply an appropriate action, such as adjust an amount of current used to charge the power supply of the data reader in the base unit responsive to the sensor detecting the approach of the user's hand.