Siemens Gigaset C590 Manuel De L'utilisateur page 16

First steps
Initial charging and discharging of the batteries
The correct charge level can only display if the batteries are first fully charged and
discharged.
Please note
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After the first battery charge and discharge you may replace your handset in
the base/charging cradle after every call.
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Always repeat the charging and discharging procedure if you remove the
batteries from the handset and reinsert them.
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The batteries may warm up during charging. This is not dangerous.
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After a while, the charge capacity of the batteries will decrease for technical
reasons.
14
¤
Place the handset in the base/charging cradle
for 10 hours.
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10 h
Then remove the handset
from the base/charging cra-
dle and do not replace it
until the batteries are fully
discharged.