Replacing The Lithium Battery - Siemens S5-155U System Manual

Power Supply Units
Replacing the
lithium battery
How to replace the lithium
battery
4 - 44
The lithium battery can be replaced without memory loss if the PSU is
switched on, the rechargeable battery is in order or you apply an
external (4.5 V) voltage to the "Ext.Batt." terminals.
Replace the lithium battery in the following steps:
Step Action
1 Slide the battery compartment cover down.
2 Pull the battery compartment out.
3 Remove the old lithium battery from the battery
compartment by inserting a screwdriver through a hole in
the compartment base to push the battery upwards.
4 Insert the new lithium battery in the battery compartment
Important
Ensure correct polarity.
5 Slide the battery compartment in.
6 Close the cover.
7 Press the Reset button.
Result (only with PSU on):
- "MB low" LED goes off.
Contacts 14 and 15 of the
Battery Warning relay are bridged.
System Manual
C79000-B8576-C199-03