Change backup battery or not?

I am in the process to replace the thermal module of my W510 machine. I have opened the cover and saw the backup battery. I am curious that  is it a good time to change the backup battery? Do I need to change it or not? It is not that easy to open the cover like this. What's your advice?

Depends on the battery type.  There are actually rechargeable types, so these will appear to last the life of the machine, or at least the time the original owner has possession of the unit.
If the battery is not the rechargeable kind, look for 2-3+ years. In any event, it's a good idea to change when the system is open if it is in a normally inaccessible area. as this will avoid any corrosion that may occur as the battery ages.  Otherwise wait until the system looses it's memory <g>.
Interstingly, my Nikon has a CR1616 button battery, and it's been over 4 years now, and still working.

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