Martel Electronics BetaGauge 3II - Manual (Page 173)

Battery Care/Maintenance A-8
NOTE: The scale is 6.5 Volts when full and 5.5
Volts when empty. Nominal full charge is
7.00 Volts, and the calibrator shuts off at
5.3 Volts. The message Low Battery
flashes when the battery voltage drops
below 5.5 Volts.
 Exact reading. You can view the exact voltage of
the current battery by pressing the BAT key on the
keypad. When you press the BAT key, the battery
voltage reading replaces the battery symbol in the
upper right portion of the LCD. When the Low
Battery message displays, the BAT key will not
accurately display the actual battery voltage.
Charging the Batteries
Standard Pack
When the standard intrinsically safe (IS) battery pack is
fully charged, the calibrator will operate continuously
for 10 hours (nominal). A discharged battery pack
requires 12 hours to reach a full charge. Each standard
calibrator includes a standard IS battery pack and
charger. Additional battery packs and chargers are
available (contact Factory Sales for details).
You can charge the battery pack while the pack is
installed or removed from the calibrator. See page A-10
for more information about IS battery packs.
Procedure
To charge the standard intrinsically safe battery pack,
plug the proper charger into the jack at the top of the
battery pack. A red LED indicator illuminates
indicating that power is available and the battery pack is
charging.