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Discussion Starter · #1 · (Edited)
Operated Roof via Battery - COMAND Settings Lost

I realize this may not have been the smartest decision...

I have a 2009 SLK300 and I operated the roof with the ignition off today in my garage. Immediately after starting the car, my COMAND system was reset to factory default settings. For the first few seconds my satellite radio said "no service", it kicked in after 30 seconds, and I realized all of my presets were gone.

There was enough battery capacity to start the car without hesitation.

FWIW - My battery is 4 years old and it's been in Florida the entire time.

Any thoughts other that I shouldn't do that again? :) I'm wondering if anyone suspects my battery might need checking/replacing.
 

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Founding Member 2006
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As an fyi, mb batteries are only waranteed for 2 years. yes, 2 years
 

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Discussion Starter · #4 ·
Yes, your battery needs checking for 'starting voltage'/replacing

and get a ctek 4.3 battery charger and charge at least weekly
humidity today in my area of floriduh was 100%
ok - so, the battery in a SLK should be able to operate the roof once without any problem? EDIT - saw your edit. Thanks. Good to know.

Never had to charge a car battery on a regular basis before. Is this a SLK thing? or MB thing?

Thanks
 

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Discussion Starter · #5 ·
As an fyi, mb batteries are only waranteed for 2 years. yes, 2 years
Crap. This car had it's battery replaced by MB after 3 years and now its almost 4 years later. So much for the 10 year battery threads.

I did see a great thread here on the Bosch battery at Pep Boys with a 4 year warranty. I think there's a sale this weekend for President's Day.
 

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charging batteries is a 'good' thing :D

the car is really 'always on'. computer, circuits, other electronic things. battery has to be great, not good and usually heavy duty which is why it costs, from mb, $160
i used to never charge until other members like etyu (see his battery hookup thread) recommend it. some members that charge have their batteries for like 8 years or more.
i used to have to replace my battery every 2 years until i started to charge weekly
 

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battery needs to be size 48
if you have mb service within 18 months or a year, labor to install is free
they come and do it at your house with alternator check and reset of windows
 

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and get that smarttop!
 

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Discussion Starter · #9 ·
battery needs to be size 48
if you have mb service within 18 months or a year, labor to install is free
they come and do it at your house with alternator check and reset of windows
My MB dealer told me they just changed the rule. I can't get MB roadside without paying a labor/service fee each time since I didn't buy it CPO (or a grandfathered in). Something about the "recent service" exception is gone.

Pepboys wants a little under $200 for a Bosch AGM. The one ranked highly here:

http://www.slkworld.com/slk-r171-general-discussion/185401-how-i-chose-new-battery-my-slk.html

The Pepboys website actually wants to charge me labor. Never heard of a car parts place charging for an installation.
 

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get your battery tested anyway. you should have at least 12.3 starting voltage
your battery might have bad cell or cells
 

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2005 SLK55 AMG
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My MB dealer told me they just changed the rule. I can't get MB roadside without paying a labor/service fee each time since I didn't buy it CPO (or a grandfathered in). Something about the "recent service" exception is gone.

Pepboys wants a little under $200 for a Bosch AGM. The one ranked highly here:

http://www.slkworld.com/slk-r171-general-discussion/185401-how-i-chose-new-battery-my-slk.html

The Pepboys website actually wants to charge me labor. Never heard of a car parts place charging for an installation.
I've just done the 'select a battery' routine. My research concluded that although AGM batteries are technically superior to flooded, they are even more susceptible to heat stress, which is why most cars fitted with them as o/e have them placed in the trunk or under a seat. SLKs have two compromises, positioning and size. With all the electric gizmos, they could really use a bigger battery, and sitting behind a hot engine is far from optimal. A lot of people have found that their expensive AGM doesn't have the intended life expectancy if it's installed in a hot location.
Consequently, I ended up buying a maintenance-free flooded battery with slightly bigger capacity than the o/e (77ah/780cca). At £55 ($80) was about £45 ($65) cheaper than the cheapest AGM I could find and I figured if I have to replace it sooner rather than later, I'll take that saving as a discount.

My battery 'failed' during a cold snap when my g/f had been using the heated seats and airscarf almost every day. However, when I removed the old battery and put it through various charge cycles, it will now hold 12.6v for several weeks just sitting in my kitchen, so I think I was a bit premature. Unfortunately though, I'm not really in a position to hook my car up to a tender to keep it topped-up during periods of high drain, so it's a bit academic.

BTW Jeff, it might be 100% humid in Floriduh just now, but it's always 100% humid inside your battery - it has to be. High ambient temperatures are what shortens their lives.
 

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Discussion Starter · #15 ·
A lot of people have found that their expensive AGM doesn't have the intended life expectancy if it's installed in a hot location.
I've been thinking about this. It's very warm and with high humidity nearly year around where I live. I think there's actually a non-AGM version of that Bosch battery available in the US. I think it's the same part number minus the AGM at the end. Although, the warranty looks like only 36 months vs 48.
 

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I've been thinking about this. It's very warm and with high humidity nearly year around where I live. I think there's actually a non-AGM version of that Bosch battery available in the US. I think it's the same part number minus the AGM at the end. Although, the warranty looks like only 36 months vs 48.
The battery I removed (now in my kitchen) is a Bosch S4. I called seven or eight battery retailers to enquire about AGM or flooded, and the majority said either 'stick to whatever was o/e' (ie, flooded) or 'avoid AGM in hot locations'. A couple, (including I might add an American battery specialist retailer) didn't have a clue and couldn't intelligently answer my question.

This is what I removed:

https://advancedbatterysupplies.co.uk/product/bosch-096/?gclid=CJ3O66i29soCFTEW0wodSdAC-Q

and this it what I replaced:

http://www.ebay.co.uk/itm/171731263232?_trksid=p2057872.m2749.l2649&ssPageName=STRK:MEBIDX:IT


Note the difference in AH, CCA, warranty.... and price!
 

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Discussion Starter · #17 ·
The battery I removed (now in my kitchen) is a Bosch S4. I called seven or eight battery retailers to enquire about AGM or flooded, and the majority said either 'stick to whatever was o/e' (ie, flooded) or 'avoid AGM in hot locations'. A couple, (including I might add an American battery specialist retailer) didn't have a clue and couldn't intelligently answer my question.
Unfortunately the last few local retailers I just searched only offer a 48 month warranty for an AGM battery. Looks like I can get 36 months with just about any battery retailer locally.
 

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Unfortunately the last few local retailers I just searched only offer a 48 month warranty for an AGM battery. Looks like I can get 36 months with just about any battery retailer locally.
Depends on the difference in price. Divide price by years and see which is better value. Keep in mind not all warranties are quibble free. For instance, they could argue that since AGM is not fitted OEM, you're not covered. Just sayin'...
 

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Discussion Starter · #19 ·
Depends on the difference in price. Divide price by years and see which is better value. Keep in mind not all warranties are quibble free. For instance, they could argue that since AGM is not fitted OEM, you're not covered. Just sayin'...
The prices you showed are great values in $USD. A five year battery would cost well over $200 here.

For the lead acid, I'm looking at about $150 for a battery from a popular local retailer. The Bosch non-AGM is $188.

AGM batteries are going to be ~$200. Basically, $50 a year either way.

Honestly, my luck I would buy the AGM and it would fail at 4 years and 1 month. I might just save 50 bucks.
 

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The prices you showed are great values in $USD. A five year battery would cost well over $200 here.

For the lead acid, I'm looking at about $150 for a battery from a popular local retailer. The Bosch non-AGM is $188.

AGM batteries are going to be ~$200. Basically, $50 a year either way.

Honestly, my luck I would buy the AGM and it would fail at 4 years and 1 month. I might just save 50 bucks.
If it were me, I'd go to Walmart, Sears or Autozone and get the best price/warranty on offer. The batteries are probably all made by Johnson Controls and labelled for each retailer. Walmart seem to least difficult regarding replacement under warranty. In a difficult climate like Florida, it's a no-brainer. The only good thing about SLK battery fitment is that although size and position is sub-optimal, at least the battery is well hidden, so no-one will know you voted with your wallet and not your pride. ;)

BTW, those British prices include free next-day shipping - and no core charge. However we do pay about $5.80/gallon for super unleaded, so it's not all 'milk and honey' :)
 
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