i heard it's about 10 years on the battery. i haven't tested the thing for 10 years, so i'm not sure :-p. depending on how much you use the key can determine how long it lasts. i had remotes that have never had a battery change (10 years) but those were the push a button to open and lock and stuff. no button start.
the ezpass i have is about 4 years old and going strong. i don't even know if there is a battery to even change in there, or how to do it w/o ripping the casing completely apart.
as for the center slot... the dealer said it would "recharge" the battery, but meh. idk. it looks easy enough to just pop open and replace a dead battery.
now will it have to be reprogrammed after a new battery?
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