A battery-powered fueling data collection unit for use with a meter and a register associated with a fuel transfer apparatus and for use with a system for managing fueling transactions of a fleet operator using fuel transfer apparatuses at multiple locations includes a fueling data interface module for receiving fueling information from the fueling meter and/or register and an internal battery power source. A processor is provided for monitoring the power level in the battery and for detecting if the power level in the battery drops below a threshold amount. Also, a communications module is provided for wirelessly forwarding an alert to a remote computer to alert the remote computer that the battery power is low.