I've had two of the same fobs for the past 2.5 years, and one is still on the original battery. The other, which was the primary fob, had to have the battery replaced after 2 years.
I've had two of the same fobs for the past 2.5 years, and one is still on the original battery. The other, which was the primary fob, had to have the battery replaced after 2 years.
We use both fobs, swapping them over every month or two, and got a bit under a year from the original batteries on our Mazda 3 with keyless entry. We've since had a bit over a year from the replacements and not had any warnings yet.