Battery life when car is garaged indefinitely
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Super Member
Joined: Sep 2017
Posts: 738
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From: Orlando, FL
2016 E400 Coupe (C207)
Battery life when car is garaged indefinitely
My car has been parked in my garage for two weeks now and is not connected to a charger. How often must it be driven in order to maintain the battery charge?
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Joined: Mar 2018
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From: Toronto area, Canada
2018 E400 Coupe C238
Thread Starter
Super Member
Joined: Sep 2017
Posts: 738
Likes: 163
From: Orlando, FL
2016 E400 Coupe (C207)
I believe the proximity of the fob to the car has an impact on the fob's battery life. Check your owner's manual; I think you'll find instructions there for temporarily deactivating a fob to keep it from continuously pinging with the car (it's a button sequence).
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2012 E550 Cab
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Thread Starter
Super Member
Joined: Sep 2017
Posts: 738
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From: Orlando, FL
2016 E400 Coupe (C207)
Deactivating and activating
If you do not intend to use a key for an extended period of time, you can deactivate the KEYLESS-GO function of the SmartKey. The SmartKey will then use very little power, thereby conserving battery power. For the purposes of activation/deactivation, the vehicle must not be nearby.
To deactivate: press the Lock button on the SmartKey twice in rapid succession. The battery check lamp of the SmartKey flashes twice briefly and lights up once, then KEYLESS-GO is deactivated.
To activate: press any button on the SmartKey or insert the SmartKey into the ignition lock. KEYLESS-GO and all of its associated features are available again.
Thread Starter
Super Member
Joined: Sep 2017
Posts: 738
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From: Orlando, FL
2016 E400 Coupe (C207)
Update: After exactly two months of complete dormancy (parked in the garage and untouched), I started my car for the first time this past weekend and took it for a drive. To my surprise and great relief, the engine roared to life on the first touch of the Start button, as if it had just been driven the day before. The total drive was probably about 30-40 miles (at least half of which was on the interstate), and the Eco feature did not shut the engine off at stops until the return leg of the journey. I have learned from experience that a weak battery will prevent the Eco feature from functioning, so I took this as an indication that the battery had been well-charged by the trip.
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Joined: Mar 2019
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From: Charlotte, NC
E550
Yeah i've had the same experience with my E400. I don't dive it often as i have 2 other vehicles, it has sat for a month with out being touched and cranks up fine every time. Sometimes i will put a trickle charger on it to top off the batteries.
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Joined: Jan 2018
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From: Atlanta GA
2012 E350 Cabriolet now SOLD to my son
The key I use regularly is kept in my bedroom at the back of the house. My spare key is kept in a kitchen drawer just inside the door coming from the garage. I did the following (from pages 85-86 of the owner's manual) and have only replaced one battery in 2.5 years of ownership.
Deactivating and activating
If you do not intend to use a key for an extended period of time, you can deactivate the KEYLESS-GO function of the SmartKey. The SmartKey will then use very little power, thereby conserving battery power. For the purposes of activation/deactivation, the vehicle must not be nearby.
To deactivate: press the Lock button on the SmartKey twice in rapid succession. The battery check lamp of the SmartKey flashes twice briefly and lights up once, then KEYLESS-GO is deactivated.
To activate: press any button on the SmartKey or insert the SmartKey into the ignition lock. KEYLESS-GO and all of its associated features are available again.
Deactivating and activating
If you do not intend to use a key for an extended period of time, you can deactivate the KEYLESS-GO function of the SmartKey. The SmartKey will then use very little power, thereby conserving battery power. For the purposes of activation/deactivation, the vehicle must not be nearby.
To deactivate: press the Lock button on the SmartKey twice in rapid succession. The battery check lamp of the SmartKey flashes twice briefly and lights up once, then KEYLESS-GO is deactivated.
To activate: press any button on the SmartKey or insert the SmartKey into the ignition lock. KEYLESS-GO and all of its associated features are available again.
