Gigaset SX790 ISDN User Manual page 13

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
u After the first battery charge and discharge, you may replace your handset
in its base after every call.
u Always repeat the charging and discharging procedure if you remove the
batteries from the handset and reinsert them.
u The batteries may warm up during charging. This is not dangerous.
u After a while, the charge capacity of the batteries will decrease for technical
reasons.
12
¤ Charge the handset for 8.5 hours in the base.
¤ Then remove the handset
8.5 hrs
from the base and do not
replace it until the batteries
are fully discharged.