ABB AC500 V3 Hardware Manual page 1015

Battery lifetime The battery lifetime is the time, the battery can store data while the processor module is not
powered. As long as the processor module is powered, the battery will only be discharged by its
own leakage current.
Insertion
2022/01/31
To avoid a short battery discharge, the battery should always be inserted or
replaced while the process module is under power, then the battery is correctly
recognized and will not shortly discharged.
To ensure propper operation and to prevent data loss, the battery insertion or
replacement must be always done with the system under power. Without battery
and power supply there is no data buffering possible.
WARNING!
Risk of fire or explosion!
Use of incorrect Battery may cause fire or explosion.
3ADR010278, 3, en_US
System assembly, construction and connection
AC500 (Standard) > Handling of accessories
1015