ABB AC500 PLC Hardware Manual page 1300

System Assembly, Construction and Connection
AC500 (Standard) > Handling of Accessories
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Remove the front cover / display by pressing the marked areas and pull it to the front.
Remove the old battery from the battery compartment by pulling it by the small cable.
Remove then the small connector from the socket, do this best by lifting it out with a
screwdriver.
Remove the battery from its package and hold it by the small cable.
Insert the battery connector into the small connector port of the compartment. The con-
nector is keyed to find the correct polarity (red = plus-pole = right side).
Insert the battery into the battery compartment on the left side as shown in the picture.
3ADR010121, 13, en_US 2019/04/17