204    HC900 Process & Safety Controller User and Installation Manual  Revision 6 
    21 April 2017 
Battery Installation Procedures 
Table 39 – Installing Backup Battery (CPU not initialized) 
Improper application of site power can cause damage to equipment. 
Ensure that the controller rack is ready and safe for application of AC power. 
Apply site AC power to the Power Supply that is associated with the controller Module..  
Press the latch on the battery cover (1) to release the battery holder, and pull on the handle (2) to 
remove the battery holder. 
Note the orientation of the battery-holder assembly (battery toward the left). 
The battery is retained in the holder by spring 
tension of the plastic holder itself. 
Insert the negative end of the battery into the back 
end of the holder, and press on the battery (see 
arrow) so that it snaps into the holder. 
To ensure that the battery is seated properly, rotate 
it in the holder, using finger or thumb pressure 
toward the positive (front) end of the battery. 
While maintaining proper orientation (battery toward the left), slide the battery holder into the 
slot in the Controller Module until it snaps into place.