Fujitsu Siemens CELSIUS 4 Series Operating Manual page 60

System expansions
Ê
Lift the contact (1) a few millimetres and remove the lithium battery from its socket (2).
Ê
Insert a new lithium battery of the same type into the socket (3).
52 - English
1
+
2
+
Extensions to the system board
+
3
+
A26361-K547-Z400-1-7419