Buffer battery in MC 6441, MC 6541, MC 6641

Make a data backup before exchanging the buffer battery.(included PLC memory !!!!)

When exchanging the buffer battery, remember:
 Switch off the machine and the TNC 640.
 The buffer battery may be exchanged only by trained personnel.
 When exchanging the buffer battery, ensure electrostatic discharge
protection. Improper handling can result in damage to the components or
assemblies due to ESD!

Battery type: 1 lithium battery, type CR 2450N (Renata), ID 315878-01

To exchange the battery:
 The buffer battery is on the main board of the MC
 Loosen the screws securing the housing cover of the MC
 Remove the cover
 The buffer battery is located on the edge of the PCB