Siemens Gigaset C590 IP User Manual page 17

First steps
Initial charging and discharging of the batteries
The correct charge level can only be displayed if the batteries are first fully charged
and discharged.
Please note
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After the first battery charge and discharge, you may place your handset in
the charger 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.
16
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Place the handset in the charger for
ten hours.
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Then remove the handset from the
charger and do not replace it until the
batteries are fully discharged.