Siemens S7-400 Installation Manual page 173

Note
If you store the batteries for a long period, a passivation layer may form. Please
read Section 6.8, Inserting a Backup Battery.
Using Backup Batteries
You should change the backup battery once a year.
Observe the usual regulations/guidelines for disposing of lithium batteries in your
country.
Backup batteries should be stored in a cool, dry place.
Backup batteries can be stored for ten years. If they are stored for a longer period,
however, a passivation layer may form.
Rules for the Care of Backup Batteries
You must observe the following rules to avoid hazards in the care of backup
batteries:
Warning
!
The improper care of backup batteries can result in injury and damage.
Backup batteries can ignite or explode if they are heated or damaged.
Backup batteries must not be
•
Recharged
•
Heated
•
Burned
•
Drilled into
•
Crushed
Store the backup batteries in a cool, dry place.
S7-400 and M7-400 Programmable Controllers Hardware and Installation
A5E00069481-04
Maintenance
7-3