How Often To Replace Car Key Battery. But for some reason, many people don’t know when it’s time to replace their car battery, even though it’s the lifeblood of their car. On average, a car battery lasts from 5 to 7 years.
As the battery wears out however, the range and signal strength of the fob transmitter will be reduced. Replacing a key fob is more costly than simply replacing the battery, so it’s worth checking if the problem can be resolved with a new battery. A key fob battery will usually last around three to four years before it will need to be replaced.
After four or five years, most car batteries will be almost completely unreliable.
So, if you’re noticing that your battery is either dying, or completely dead, it’s time to start thinking about a replacement. After following the third step, with your vehicle key in position and the engine on the ignition mode, press and hold the lock button on the key fob, and then turn the vehicle key back off. No matter what type of key fob you have, you can replace the battery in a few minutes. A key fob battery will usually last around three to four years before it will need to be replaced.