Watches, key fobs, car batteries all seem to last at least 5 to 10 yrs, sometimes longer. But once they are replaced, you need to do so yearly?
In: 10
Because you have to buy more batteries. Same reason why you will never see the ever lasting light bulb.
The original battery, is probably a higher quality battery. Because the manufacturer of said product, wants to sell a good product that is known to last (and probably stay functional within the warranty window)
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