Mitsubishi Electric MELSEC iQ-R Series User Manual page 111

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3.
Remove five board fixing screws (M2) from the board.
4.
Detach the printed circuit board from one another.
5.
Cut off the  (lead) portion of the battery, which is
attached on the surface of the printed circuit board with
RS-232 connector, using a tool such as nippers, and
remove the battery.
6.
Dispose of the battery in accordance with the disposal
regulations of local governments.
Appendix 3 Handling of Batteries
A
APPX
109