Siemens Hicom cordless EM Operating Instructions Manual page 18

Putting the mobile unit into service
Note on using NiMH batteries:
After you have inserted the NiMH batteries, we recom-
mend that the mobile unit be fully charged and then dis-
charged until the battery warning beep is heard, i.e.
without replacing the batteries in the charging shell. This
ensures that the charge status display of the
mobile unit is adapted to the increased operating life of
the NiMH batteries.
Thereafter, you can place your mobile unit in the charging
shell each time it is used. Charging is electronically con-
trolled, so that the batteries are charged optimally.
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