How Long Does a Mercedes Car Key Battery Last?
2 Answers
The battery in a Mercedes car key typically lasts 2-3 years. More details about car key usage are as follows: 1. Car key vehicle locator function. The vehicle locator function uses the remote or alarm system; pressing the button will cause the car's horn to sound and the hazard lights to flash, making it easier to quickly locate your car in crowded parking areas. 2. Using the car key to close windows after turning off the engine. Repeatedly starting and stopping the engine can place a burden on it and shorten its lifespan. This situation can be resolved using the remote key. After exiting the car, holding down the lock button can remotely close all four windows, which is a very convenient and frequently used feature.
I've been driving this Mercedes for three or four years now. The key fob battery typically lasts about two years on average. If you frequently press the unlock button or use it in extreme temperatures like a hot car in summer, the battery drains faster and might need replacement within a year. I've changed it once before - it's quite simple: just buy a CR2032 coin cell battery from the supermarket for a few bucks, gently pry open the key's back cover with a small tool and replace it. Don't worry, you can easily do it yourself. The key is to watch for weakening signals - if the remote range shortens or unlocking becomes sluggish, that's your signal to replace it. Normally, keeping it in your bag, avoiding moisture exposure and direct sunlight can extend its life by several months. Overall, the Mercedes system is quite reliable.
