Siemens SIMATIC S7-400 Hardware And Installation Manual page 157

The following figure shows how to insert two backup batteries in a double-width
power supply module.
Warning
!
Hazardous to persons and property, risk of pollutant emission.
A lithium battery can explode if treated incorrectly; improper disposal of old lithium
batteries can result in pollutant emission. The following instructions should
therefore be observed without fail:
Do not throw new or discharged batteries into a fire and do not solder onto the
cell body (max. temperature 100 C). Do not recharge, there is a risk of
explosion. Do not open the battery, and only replace it with one of the same
type. Obtain the replacement via Siemens (see the Reference Manual ,
Chapter 11 for the order number). This will ensure that you have a short-circuit
protected type.
Old batteries should be disposed of with battery manufacturers/recyclers if
possible, or as hazardous waste.
S7-400 and M7-400 Programmable Controllers, Installation Manual
C79000-G7076-C424-01
www.gkbpx.com
Starting Up
6-15