Battery died because I forgot to...
Thread Starter
Senior Member
Joined: Jul 2016
Posts: 279
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From: CA Bay Area
2019 GLC 63 SUV, 2013 SLK55
Battery died because I forgot to...
Lock the car? Came back to work from lunch, five hours later the Mercedes Me app warned me of critical battery levels. Checked the app, it also indicated the car was unlocked. Went out to see, battery was completely zonked out and had to get a jump. The battery is perfectly fine with the car locked, heck I just came back from a 2-week vacation and it started right up. Seems idiotic though that the car's electronics don't have the sense to go to sleep ever if the car is unlocked. Seriously?
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Joined: Feb 2017
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From: Northeast, USA
GLC43, GTI, X3, Mazda3
Sorry to hear about your situation, but I had to chuckle a bit because my better half always makes fun of me when I hit the lock button on my GLC after pulling into the garage. I tried to explain to her that the "system" continues to search for things like Bluetooth, etc. if you don't lock it...hence battery issues. Learned the hard way, like you, with my old BMW. That said, I agree with you that you'd think MB could come up with a way to shut it all down after "X" amount of time or at least have the MM App alert you after say 10 minutes or so to lock your vehicle. 
Thread Starter
Senior Member
Joined: Jul 2016
Posts: 279
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From: CA Bay Area
2019 GLC 63 SUV, 2013 SLK55
If it was something else surely it would also have died in the two weeks the car sat unused directly prior to this event. And every day afterward I've remembered to lock it and it's been fine. I suppose I could test the scenario again but I'm not eager to ruin a probably $400 battery with repeated drainings. Guess I'll resign myself to having to carry one of those handheld lithium jump-starters like I do in some of my other cars (all 50 years older than this one, lol).
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Senior Member
Joined: Jul 2016
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From: CA Bay Area
2019 GLC 63 SUV, 2013 SLK55
Well I have nothing that could be draining power from an always-on 12v circuit so I guess it will forever remain a mystery what happened that fateful day. Unless... did I leave the ignition on in setting 1 or 2? Certainly the engine wasn't on but maybe accessory on positions don't turn off automatically. Embarrassing.
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Member
Joined: Jan 2019
Posts: 76
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what kind of person doesn't automatically press lock when they leave their car? doesn't matter where its parked... should be automatic.
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Joined: Aug 2018
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2018 AMG GLC 43
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.
Well I have nothing that could be draining power from an always-on 12v circuit so I guess it will forever remain a mystery what happened that fateful day. Unless... did I leave the ignition on in setting 1 or 2? Certainly the engine wasn't on but maybe accessory on positions don't turn off automatically. Embarrassing.
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Joined: May 2008
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From: dfw
'10 C63
Well I have nothing that could be draining power from an always-on 12v circuit so I guess it will forever remain a mystery what happened that fateful day. Unless... did I leave the ignition on in setting 1 or 2? Certainly the engine wasn't on but maybe accessory on positions don't turn off automatically. Embarrassing.
Doesn't seem normal. I'm like a few others here when the car is in the garage. Never any issues for days of not starting. You have anything hardwired to the car? Radar, dash cam... If not, my guess would be the Mercedes me connect app and your car. If you leave your car unlocked, you should have received a notification from the app telling you that your car is unlocked waaaaaaay before getting a message about your battery. Maybe that day there was an issue with the app due to an update Mercedes made or maybe your car was parked somewhere that day it was having trouble getting a signal out and it kept trying to reach you or perhaps the connection with the Mercedes server was bad.
also, the car would shut itself off in 1 or 2 after a while. The car's Bluetooth turns off with the car and doesn't have anything to do with locking the car. The Mercedes connect does use your battery. It needs to check your car every now and then ironically to check your battery status and other things.
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Joined: Jan 2019
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From: California
2019 AMG C63S
When I had left the car at the detailing shop for 5 days to get Paint Protection Film and Ceramic coating done, they pretty much left the car unlocked when they were working on the car. The doors were also left open for a long time. After three days, I started getting the Starter Battery Critical alert through Mercedes Me app on my phone. I then had to call the shop and have them keep the engine running for 10 mins to help keep the battery charged. The same thing happened two days later when I went to pick up the car. There was some charge left luckily when I picked up the car, otherwise would have had to jump-start the battery.
Last edited by Tuxdude; Aug 18, 2019 at 08:37 PM.
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Joined: Nov 2018
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GLC63S
I had the battery warning when they were working on my car car after in first came in. Most likely became discharged while sitting at the port for nearly 6 Months.
Last edited by Henry Stark; Aug 17, 2019 at 11:39 PM.
Thread Starter
Senior Member
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From: CA Bay Area
2019 GLC 63 SUV, 2013 SLK55
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From: milwaukee
2009 CLS550, 2005 E320 Estate 2017 GLC43C4
2) These batteries are AGM ( Absorbent Glass Mat) , by that, I mean they need a different type of charger than a conventional lead acid battery, if you use a charger that is not designed for AGM batteries, you can toast a AGM battery. Has that occured to anyone?
MBWorld Fanatic!
Joined: May 2008
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From: dfw
'10 C63
1) Has anyone performed a draw down test on their battery? If so was there a drain?
2) These batteries are AGM ( Absorbent Glass Mat) , by that, I mean they need a different type of charger than a conventional lead acid battery, if you use a charger that is not designed for AGM batteries, you can toast a AGM battery. Has that occured to anyone?
2) These batteries are AGM ( Absorbent Glass Mat) , by that, I mean they need a different type of charger than a conventional lead acid battery, if you use a charger that is not designed for AGM batteries, you can toast a AGM battery. Has that occured to anyone?
Member
Joined: Oct 2021
Posts: 77
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From: USA
2022 GLC 43 AMG SUV
Battery self-discharge
We left for a 2-month-long vacation, and after about 6 weeks, I got the same warning from my wife's GLC 300 SUV. The car is locked like everything else, so I had to ask a friend to drive the car for 25 miles to partially charge the battery. It still shows in Mm as only partially charged... The car has 9,000 miles on it; strange.
Also, I have to complain about the Mm app, since the app should show the actual battery voltage, not just an approximate description Fully Charged, Partially Discharged etc. MB folks surely know how to measure battery voltage...
Also, I have to complain about the Mm app, since the app should show the actual battery voltage, not just an approximate description Fully Charged, Partially Discharged etc. MB folks surely know how to measure battery voltage...
Last edited by TonyG3D; Jul 16, 2022 at 05:01 PM. Reason: fix spelling
Member
Joined: Jun 2021
Posts: 165
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C63
Even locked, UNLESS you secure the connectivity (To MB Me etc.), it will eventually drain the battery. The car still reports status like lock etc. but it isn't using alot of power to ping and respond. My C63 would go almost 2 months before I would get the notice in Mercedes Me app that my batt/power was low. Sure, Mercedes could make the system even more complicated and add a sensor or hook to read the voltage and report it, but then you will be using more power to report voltage as opposed to a single "threshold" broach, i.e. low voltage warning-
Here's a article that might help-
https://www.mercedesmedic.com/battery-drain-problem/
Here's a article that might help-
https://www.mercedesmedic.com/battery-drain-problem/
Last edited by I_love_ICE; Jul 17, 2022 at 04:43 PM.
Newbie
Joined: Nov 2020
Posts: 13
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2018 GLC63S Coupe'
I don't lock my GLC63S in my locked and monitored garage; however, if I know I won't drive it for a couple of days, it goes on my NOCO charger (AGM).
I had one incident, a week after purchase, that my battery was dead. MB responded and jumped it just fine (yeah, all my jump starting stuff was ignored and drained /sigh).
No more.
I had one incident, a week after purchase, that my battery was dead. MB responded and jumped it just fine (yeah, all my jump starting stuff was ignored and drained /sigh).
No more.
Even locked, UNLESS you secure the connectivity (To MB Me etc.), it will eventually drain the battery. The car still reports status like lock etc. but it isn't using alot of power to ping and respond. My C63 would go almost 2 months before I would get the notice in Mercedes Me app that my batt/power was low. Sure, Mercedes could make the system even more complicated and add a sensor or hook to read the voltage and report it, but then you will be using more power to report voltage as opposed to a single "threshold" broach, i.e. low voltage warning-
Here's a article that might help-
https://www.mercedesmedic.com/battery-drain-problem/
Here's a article that might help-
https://www.mercedesmedic.com/battery-drain-problem/
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From: CA
GLC43
