LED Battery Status Indicator If the battery charger is connected correctly, the LCD panel will turn on and display ?0.0V?. The battery charging indicator includes three parts, the clips, the straight/wave line and the battery symbol. As the LCD display panel shows ?0.0V?, the battery indicator will also display the clamps, the straight line only, and the battery symbol. The voltage/amperage unit indicator ( on diagram) will display depending on the setting. If the charge button on the control panel is pressed, the LCD screen will display the output current that is charging the battery. During charging the clips will remain on the display, the straight line will flash, the battery symbol will flash, and the battery bars will increase as the voltage goes up. If the battery voltage detected.