ABB AC500 PLC Hardware Manual page 1228

System Assembly, Construction and Connection
AC500-eCo > Handling of Accessories
4.
1228
Remove the battery.
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ATTENTION!
Lithium batteries must not be recharged, not be disassembled and not
be disposed of in fire.
Exhausted batteries must be recycled to respect the environment.
Dispose of battery properly according to disposal procedures for
lithium batteries.
3ADR010121, 13, en_US 2019/04/17