Probably simply the quality of the replacement battery. I'm fairly sure that most outlets that replace watch batteries do not buy the good ones. Similarly, it is nigh on impossible to buy legit batteries on eBay if you're doing it yourself.
Agreed. You gotta buy lithium and preferably Swiss batteries (like Renata).
@pdlouche started
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Probably simply the quality of the replacement battery. I'm fairly sure that most outlets that replace watch batteries do not buy the good ones. Similarly, it is nigh on impossible to buy legit batteries on eBay if you're doing it yourself.