WinCEGeräte_Handbuch_Administration_v2 00_en
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2 Device functions
2.1 Battery
In MDT devices, a battery is used to supply the entire device with power. ACD ensures that applications are
provided with all the relevant internal information required to operate the battery.
2.1.1 Changing the battery
When the battery is replaced, the large capacitors are used to manage backup functions for the clock and
power supply. They are recharged by the battery within minutes. For this reason, it is not possible to
change an unlimited number of batteries in immediate succession.
Without a battery, the clock can continue to keep time for a few days with the help of a backup. Change the
battery within approx. 10 seconds when the backup capacitors are charged.
For power-saving reasons, the display is deactivated in this period. All other device functions, especially the
processor, memory and WLAN continue functioning which supports the principle of a quick battery change
without interrupting operation.
2.1.2 Battery capacity and information
The status bar (see Chapter 2.2.1, page 14) features by default an icon to indicate the current battery
capacity. Another indicator can be enabled with ACDStatview (Chapter 2.2.2, page 15).
The battery management system transfers this information to the operating system. The operating system's
profile scheme (Windows CE 6) can be used in this way:
You can configure display settings (brightness, the amount of time the system must be idle before turning off
the display) and power scheme (time until suspend) separately for the battery and external supply modes.
If the battery capacity drops during operation, messages are sent to the entire system. Applications can use
this information to take the necessary backup precautions to prevent data loss or disable critical functions. A
clean logout from the server is also possible with online applications. More details can be found in the
programming documentation.
