Siemens SIMATIC HMI IPC677C Operating Instructions Manual page 140

Service and maintenance
11.8 Removing and installing hardware components
Replacing the battery
Steps for replacing the battery
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Open the battery compartment.
Remove the battery holder.
Detach the cable.
Remove the old battery.
Fasten the new battery and reinsert the battery holder.
Close the battery compartment.
SIMATIC HMI IPC677C
Operating Instructions, 04/2013, A5E02722710-04