Battery Handling, Maintenance and Good Practices
The AC Power LED is only on when the power cord is connected and AC power is available
to the Monitor. In this case, the battery can be either charging or fully charged.
The battery LED can be green, yellow, or red depending on the following conditions:
(>= 5 minutes of
a. Relative state of charge.
b. Battery voltage less than 11.5V.
c. Restart is attempted if V_bat > 11.5V and battery is not registered as being empty or having a malfunction.
If the remaining battery-operating time is only 5 minutes, the LED flashes red at a repetition
rate of 1.5 flashes per second.
When the battery is empty, the Monitor switches off automatically (including the green On-
Off/Standby LED on the front panel). This switch-off event is memorized together with the
serial number of the battery. A restart of the Monitor with this battery is inhibited to prevent
deep discharge. Attempts to restart the Monitor (by pressing the On-Off/Standby) causes the
red LED to emit a single flash. (The flash may have a delay of up to 2.5 sec after pressing the
On-Off/Standby key). Exchanging the battery causes one of the following to happen:
• If the new battery is partly or fully loaded, the Monitor starts operating.
• If the new battery is empty:
on or off
every 2 second briefly
If the battery voltage (no load) is below 11.5V, a single red flash is emitted (assuming that
there is still enough power to emit this single flash).
If the battery voltage is higher than 11.5V (no load) the Monitor tries to restart. If the bat-
tery voltage falls below 10.5 V during charging, the Monitor registers the batttery as
empty, and the Monitor switches off automatically. Any attempt to restart the Monitor (by
pressing the On-Off/Standby) causes the red LED to emit a single flash. No more restarts
can be attempted with this battery.
1.5 red flashes per sec.
red flash if On-Off /
Standby is pressed.
red flash if On-Off/
Standby is pressed
Maintaining the Instrument