Martel Electronics BetaGauge 3II - Manual (Page 172)

A-7 Battery Care/Maintenance
Viewing the Battery Voltage
There are two methods for viewing the current battery
voltage:
 Approximate reading. A battery symbol, in the
upper right corner of the LCD display, shows the
approximate battery voltage. The highlighted (or
dark) portion of the battery indicates the amount of
available voltage. Refer to the examples below:
Figure A-1 Viewing Approximate Battery Readings