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Discussion Starter #1
My SLK, which has never given me a problem, will not start.

When I turn the key, there is a loud clicking noise at about twice per second and any warning lights dim in sympathy with the clicks.

Any thoughts?

The car hasn't been used for about 6 weeks and was last started a couple of weeks ago.

Many thanks

John
 

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Founding Member #2 2008 SLK55 AMG
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How old is the car battery?
 

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Founding Member #2 2008 SLK55 AMG
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Thanks for the response.

I've had the car for two years so it's at least two year's old.

John
Do you know if the previous owner ever had to replace the battery? My guess would be a daft car battery.
 
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Discussion Starter #5
I'm sure this is not the original battery but can't say how old it is. I have it on charge at the moment in the hope that I'm suffering from low power owing to little recent use and cold weather.

John
 

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Founding Member #2 2008 SLK55 AMG
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I'm sure this is not the original battery but can't say how old it is. I have it on charge at the moment in the hope that I'm suffering from low power owing to little recent use and cold weather.

John
Do you have a voltmeter?
 
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Discussion Starter #7
Re voltmeter...not at the moment as son's is at his work until Monday.

Battery does seem to be taking charge though.

John
 

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Discussion Starter #8
Thanks everyone. I believe the problem is with the charge in the battery, or lack of. After 2 hours on charge, car started.

Left on charge overnight, I will give the car a good run today.

I think this is about my having become complacent after a few years of mild winters. Certainly last winter and the one before I took the car out most weekends.

With the snow in the UK over the past two months and my 2 week holiday in between, I've neglected my SLK.

John
 

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Administrator 2009 SLK 55 AMG/Founding Member 2006
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slk batteries last only 2 years. i have had 3 slks, and like clockwork, every 2 years, i have had to replace the battery
 

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slk batteries last only 2 years. i have had 3 slks, and like clockwork, every 2 years, i have had to replace the battery
Mine will be six years old in November, and it still works perfectly - I do keep it on a battery tender all the time though.
 

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Discussion Starter #11
Yep! A battery tender is what I need. I have one for my bike but it isn't powerful enough for the SLK

Any recommendations? Ctek?

I use an Optimate for the bike.

John
 

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I just use one of THESE from Halfords. (I use them on the bikes also). They do not need to have a high power output, as you are not charging a flat battery, you are just keeping it topped up, and powering the clock, alarm and anything else that is continually powered, which just draw milliamps. As long as you get an 'intelligent' tender like the Optimate or the Halfords ones I use, you won't have any problems.
 

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My battery just died at 5 years and thats with regular use but in hindsight it was going off colour 6 months ago , the cold has exposed it.
 

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2002 slk32 with the oem battery still crankin!!
You got to be getting pretty close to the end on that thing. The MB battery in my 560SL died after eight years which is pretty darn good I thought. Do you replace batteries after so many years or do you just wait for them to conk out? With my Mercedes Roadside Service experience on my 560SL last spring, I may just wait, although once I get to eight years, I might decide it's time. :)

Len
 

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Founding Member #2 2008 SLK55 AMG
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2002 slk32 with the oem battery still crankin!!
You got to be getting pretty close to the end on that thing. The MB battery in my 560SL died after eight years which is pretty darn good I thought. Do you replace batteries after so many years or do you just wait for them to conk out? With my Mercedes Roadside Service experience on my 560SL last spring, I may just wait, although once I get to eight years, I might decide it's time. :)

Len
IIRC, the car battery spec for UK is different from those fitted to US spec cars.
Code 673 High-Capacity Battery is on the data card of US spec vehicles, ergo, it may seem the US spec batteries last longer.

I wonder what other members' experiences are, especially the northeast US? How long does the vehicle battery last?
 
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