The LCD display will show you the battery pack's voltage real-time voltage.
Whenever your bike starts moving, the power consumption increases as there’s more power needed to break from a standing position. This will show as your battery voltage dropping and the current consumption increasing. The current consumption can be seen in the Watts measurement.
Volts x Amps = Watts
Voltage measures the electromotive force. Amps measure current. Watts is a measure of power.
After the bike starts moving the voltage measurement will go back to normal as the current consumption goes down.
The more demand, the more the voltage will drop while using the Amp Hour (battery) charge. This is also what happens when starting up a hill as the power need gets fulfilled.