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BETA903A USER MANUAL - 28 -
2.8. BETA903A power status
When no (optional) battery is installed in BETA903A, the power is support by car battery – that is,
car switch needs to be “on” position and power switch of BETA903A need to be on to boot up.
If optional battery is applicable, simply power on BETA903A module to boot up using the battery
power. To charge the battery, turn the car switch on. The charging will be automatically stopped
as soon as the batter is fully charged.
Status Table
Mode Car switch
BETA903A
Power switch
BETA903A
Battery Status
RTC
Battery Status
BETA903A
Host status
1 OFF OFF No charging Charging Off
2 ON OFF Charging Charging Off
3 ON ON Charging Charging On
4 OFF ON No charging Charging On
RTC (Real Time Clock) battery:
Mode 1 - When car switch and power switch of BETA903A are both OFF, the RTC battery
inside BETA903A still supply power to CPU-RTC and GPS-memory. During this mode, RTC
battery still get slightly charged even for long time no use.
RTC battery can sustain GPS-memory for up to one month. If the next power on occurs later
than one month, it may require more time (up to 30 minutes) for GPS re-positioning to
re-initialize the GPS-memory.
Note that if GPS positioning always takes more than 30 minutes for every boot up, it may due to
the failure of RTC battery. It is recommended to replace the RTC battery.
Mode 2 - Turn car switch on while keep BETA903A off, BETA903A battery and RTC battery will
get charged from car battery.
Mode 3 - Turn car switch on, then turn BETA903A is on. Same as mode 2, BETA903A battery
and RTC battery will get charged from car battery.
Mode 4 - Turn car switch off, Same as mode 1, BETA903A battery will NOT get charged, and
RTC battery will get charged by car battery.
Just a reminder, the RTC battery always get charged by car battery for all switch combinations.