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Information and Communication Products
Mobile Phones
7.5
Deep Discharge
In case of a deeply discharged battery, the phone can not be turned on and the normal char-
ging process can not be started. No charging symbol is visible in the display. This is because
the voltage of the battery is too low to operate the charging circuit and the display controller.
In this case, charging the battery is divided into two different steps, which do cannot be
started automatically but have to be run subsequently by the user :
a) Trickle charge
Trickle charge mode is automatically started if the battery voltage is below a certain value
when the charger is connected to the mobile. This mode is not terminated automatically but
has to be terminated by disconnecting the charger.
Trickle charge mode has to last minimum until the battery voltage has exceeded a certain
level. During trickle charge the charging symbol will not be visible and the telephone can not
be turned on. This is because the battery voltage is too low to operate the telephone
Action:
Insert battery into handset and connect travel charger to the telephone. Wait for appr. 1 hour,
then disconnect and reconnect charger. If the battery voltage is high enough again, the
charging symbol will come up.
If the battery is discharched very deeply, the symbol may not come up and the trickle charge
time possibly has to be extended up to 24 hours.
b) Normal charge
When the battery voltage is above the a.m. value (e.g. by trickle charge) the mobile will start
the normal charging mode and show a charging symbol in the display.
Action:
Connect charger to the telephone (see chapter „Charging")
The charging symbol will come up as an indication that the normal charging process has been
started by the mobile.
V 1.0
Service Manual S25 / S2588
ICP CD ST
R. Fleuren
Sm_S25_lvl2_v11
Page 28 of 35
06/99
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