3.4.4 Battery management
The PROFI TX records the current during transmitter operation and while loading
the transmitter battery. The available battery charge is calculated on the basis of
the power meter reading, the temperature and the voltage. The remaining
operating time (time to empty) is calculated from charge and current and is shown
on status display #2 (see page 87). The calculation takes into account that current
consumption slightly decreases with decreasing battery voltage.
Battery alarm
If the remaining operating time (time to empty) falls below the set threshold,
an audible alarm is issued. The respective displays flash on status display #2.
The factory setting for the alarm threshold is 60 minutes. This value can be
changed in the Setup > Transmitter > Battery alarm menu (see section
5.3.8 "Transmitter" on page 109).
Self-discharge
If the transmitter is stored for a prolonged period, the available battery charge is
calculated on the basis of multiple parameters when the transmitter is switched on.
The displayed charge and time to empty are not initially very accurate. Precise
values are displayed after a few charging / discharging cycles.
Under-voltage cut-off
If the operating voltage falls below 2.8V the device is automatically switched off
without further warning. If the voltage is below 2.9V, it cannot be switched on:
The following message is briefly displayed on the screen: BATTERY DOWN!
Charge the transmitter battery!
If voltage is low, recharge batteries as soon as possible (within 1-2 days) to avoid
damage due to total discharge. Observe the notes on charging (see section 3.4
"Transmitter battery" on page 41).
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