Dead Flat

[stubax]

Went out to use my GLC250 petrol, pressed remote and ...........nothing. Got spare remote but same result. Opened car using emergency key but everything was dead, no ignition, interior lights or anything electrically powered, car was fine when parked up last night.

A phone call and 2 hours later Mobilo/RAC van arrives and jump starts car. The guy did multiple checks but there was no fault codes or battery drain. He did say that he had come across this multiple times and that it was becoming more common place due to increased electrical complexity. When he left car would self start but he recommended either charging battery or taking it for a long run, car is now on my conditioning charger overnight. Still not fully charged after 4 hrs.

 

[ioweddie]

Something must have been left on...interior light or boot light fault maybe

 

[stubax]

You might think so but car was last used in daylight, tech couldnt find a cause.

 

[Petrol Pete]

You don't say how old the car is, but the way I see it from multiple posts on here most MB cars will need new batteries every bloody 2 years at this rate.They will become as disposable as tyres/brake pads/fuel.

Not long now the B service will mean 'B' for battery.

 

[wongl]

Best to get something like a CTEK charger and charge the car overnight monthly if possible to preserve the battery.

 

[Rory]

We have newish VW and SEAT cars on the family fleet and I keep an eye on the relevant forums and I'm seeing this kind of thing quite a lot. General concensus is that it's crap batteries, and if they pass tests the dealers won't replace them under warranty. A number of users are using chargers regularly.

 

[wongl]

Do

We have newish VW and SEAT cars on the family fleet and I keep an eye on the relevant forums and I'm seeing this kind of thing quite a lot. General concensus is that it's crap batteries, and if they pass tests the dealers won't replace them under warranty. A number of users are using chargers regularly.

Don't know about newish cars - so far my 2016 W205 seems to be doing okay, but it is on charged when not being used since this is low mileage car only being used mainly on longer runs.

On the otherhand our experience with other older mercedes have been excellent.

1. 2006 W169 on its original MB factory fitted battery up till it when it was written off in 2018.
2. 2009 W169 still on its original battery
3. 2010 W169 still on its original battery (but although it starts without trouble, the CTEK indicator connector is flashing red which means it is below 60% so probably time to replace soon. This is probably caused by the convenience lighting that stays on after the car is switched off and locked)

All three W169 get an overnight charge twice a year with a cheapo Aldi charger.

 

[artyman]

I still have the original battery in my W204 2008 I give it a recondition charge about every 9 months

 

[Petrol Pete]

I keep telling Administrators we need a 'battery only' section on here...is this the beginning !!? ..Or the beginning of the end ? It could go flat at any minute .

 

[richard]

The GLC (and other modern Merc) turn virtually everything off , and stuff they dont turn off gets turned off if battery system detects a drain. So its really hard to get a C or GLC (and even more so the E) to flatten its battery ... Also, Mercedes ME tells you if the battery gets critically low ...

Richard