I have replaced watch batteries myself and was wondering if it is possible to replace Key FOB Battery too?
Depends, some FOB’s are just snap off backs with a coin, others have 3 or 4 little screws, that unless you have the exact electronic screwdriver, can be impossible to get off. Either way, you then have to determine what weird battery it takes and obtain it.
I actually took 2 FOB’s here today, was $9.xx with tax. Needed it done, one was totally dead. They were quick and friendly, no hassles. in and out in less than 10 mins.