Siemens SIMATIC S7-300 Hardware And Installation Manual page 158

Maintenance
Disposal
Note your local regulations/guidelines on battery disposal.
Storing backup batteries
Store backup batteries in a dry and cool place.
The shelf life of backup batteries is five years.
Warning
If heated or damaged, backup batteries can ignite or explode and cause severe
burning injury.
Store backup batteries in a dry and cool place.
Rules for the handling of backup batteries
To avoid risk of danger when handling backup batteries, note the following rules:
Warning
Improper handling of backup batteries can cause injuries and property damage.
Improperly handled backup batteries can explode and cause severe burns.
Do not
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Rules for handling the rechargeable battery
Do not charge rechargeable batteries in devices other than the CPU. The
rechargeable battery must always be charged in the CPU, in POWER ON state of
the CPU.
9-10
S7-300 Programmable Controller Hardware and Installation
A5E00105492-01