SL/R230: Battery tender
Member
Joined: Oct 2004
Posts: 162
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From: Stockholm, Sweden
SL 600 640bhp/1000Nm
I dont think so.
I use two chargers when I winter store my baby now.
Last winter I only use one tickler to the front and and the rear was out when I started it up a few months later.
Nicke
I use two chargers when I winter store my baby now.
Last winter I only use one tickler to the front and and the rear was out when I started it up a few months later.
Nicke
Thread Starter
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Joined: Nov 2008
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E320 CDI, SL550, clk550
Thanks
Junior Member
Joined: May 2007
Posts: 30
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From: South Bay, SF Bay Area
2004 SL55
I think I read somewhere that the starter (front) battery will eventually not draw any power and will stay charged for months. The rear battery supports the electronics and will only last a week or two. I always trickle charge the rear, but haven't needed to charge the front but it only sits for about a week or two max. The rear battery warning will come on if I don't charge it after about 5 days.
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Joined: Feb 2004
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From: Arizona
SL55AMG, Ferrari 348, Ferrari Testarossa, Ferrari F40, Ferrari Mondial t, Ducati 916, Indycar
When my SL55 sits for more than 2 weeks the rear battery is the one that gets weak. I am still able to start the car, but there is the 'consumables off line" message. Within a few miles of driving it is fully charged.
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Joined: Dec 2005
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From: Ann Arbor
'03 SL55
+1. I put the charger on the rear battery, not the front.
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Senior Member
Joined: Apr 2006
Posts: 353
Likes: 83
From: Bonita Springs, FL
2021 Cirrus Silver S580 AMG, 2020 Polar White GLE350
Best SL Battery Charger
The best way to keep your car charged while in storage is to use the CTEK Multi 3300 battery charger. This is the exact same unit sold by Mercedes, but MB parts charges a much higher price than other CTEK retailers. The CTEK is a trickle charger that electronically maintains the charge in the battery. I hooked the device up to the trunk battery in my 2007 SL600 last year while I spent the winter in Florida, 4 months later when I got back to Chicago, my SL started right up and was fully charged. I purchased my charger on line from the Home Depot who had the best price, however there are other retailers listed on line. Other friends with SL's report great results with this charger. Just make sure you attach it to the trunk battery as that also keeps the under hood battery fully charged. TwinCam
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Joined: Nov 2008
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E320 CDI, SL550, clk550
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300E a couple 1994 w124wagon E320 Wagon/,1971MGB Track/Rally, MG Midget Autocross ,2000 E320 wagon.
Make sure the batteries are fully
charged before storage,then hook up
http://www.harborfreight.com/cpi/cta...emnumber=42292
it works great.
http://www.harborfreight.com/cpi/cta...emnumber=42292
it works great.
Member
Joined: Mar 2008
Posts: 104
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From: mishref
2005 vw touareg, sl500 r129 SOLD, 2002 sl500 kleemann
what if i got the battery sign, and the consumables offline sign when i drive the car, not even off for 12 hrs or so... maybe the alternator?
what else could be the problem, now i turn on the car and it turns off by itself..
and i get the STOP turn off car sign.
anybody else has the same problem?
khaz3al
what else could be the problem, now i turn on the car and it turns off by itself..
and i get the STOP turn off car sign.
anybody else has the same problem?
khaz3al
Junior Member
Joined: Jul 2008
Posts: 62
Likes: 1
E550 Cab
Can you connect this battery tender to the Convenience battery while the Conv Battery is still connected to the car ? -- Or does it have to be disconnected
While away over Xmas I connected my Porsche Battery Maintainer ( via the Cigar Lighter ) and I don't think this fed into the convenience battery --- Car still starts and runs but " Convenience Functions Temporary unavailable" -- I've tried driving the car ( albeit only 20 miles ) and Convenience Functions yet to return
My Range Rover was parked ( outside) at Newark with a Solar Powered Maintainer plugged into cigar lighter and it started up first time
While away over Xmas I connected my Porsche Battery Maintainer ( via the Cigar Lighter ) and I don't think this fed into the convenience battery --- Car still starts and runs but " Convenience Functions Temporary unavailable" -- I've tried driving the car ( albeit only 20 miles ) and Convenience Functions yet to return
My Range Rover was parked ( outside) at Newark with a Solar Powered Maintainer plugged into cigar lighter and it started up first time
Senior Member
Joined: Dec 2002
Posts: 384
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From: FORT LAUDERDALE FL
2019 S63 COUPE
Can you connect this battery tender to the Convenience battery while the Conv Battery is still connected to the car ? -- Or does it have to be disconnected
While away over Xmas I connected my Porsche Battery Maintainer ( via the Cigar Lighter ) and I don't think this fed into the convenience battery --- Car still starts and runs but " Convenience Functions Temporary unavailable" -- I've tried driving the car ( albeit only 20 miles ) and Convenience Functions yet to return
My Range Rover was parked ( outside) at Newark with a Solar Powered Maintainer plugged into cigar lighter and it started up first time
While away over Xmas I connected my Porsche Battery Maintainer ( via the Cigar Lighter ) and I don't think this fed into the convenience battery --- Car still starts and runs but " Convenience Functions Temporary unavailable" -- I've tried driving the car ( albeit only 20 miles ) and Convenience Functions yet to return
My Range Rover was parked ( outside) at Newark with a Solar Powered Maintainer plugged into cigar lighter and it started up first time
i found that the light under the mirror would come on while it was connected. i dont think the sl electronics like it.
Junior Member
Joined: Mar 2008
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16 S550
concerning the above posts, an engineer from deltran (the battery tender manufacturer) opines that if you try to charge both batteries by connecting to the rear one only, you run the risk of frying the front battery if the rear one fails. he says that the battery tender will read the bad rear battery as needing more charging and the resulting increased charging will cause the front battery to be overcharged. i guess if you're convinced that both batteries are in good condition, this would not be a worry.
for what it's worth.
Member
Joined: Jul 2008
Posts: 213
Likes: 31
From: SW Florida
1995 SL500 - 2017 AMG GLC 43
Read this for the truth instead of a bunch of Internet opinions that may or may not be correct. Do your homework. http://batterytender.com/faqs.php?os...4a358a7302eb85
Senior Member
Joined: Jan 2009
Posts: 337
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From: Montrose, CA
2007 SL550
While away over Xmas I connected my Porsche Battery Maintainer ( via the Cigar Lighter ) and I don't think this fed into the convenience battery --- Car still starts and runs but " Convenience Functions Temporary unavailable" -- I've tried driving the car ( albeit only 20 miles ) and Convenience Functions yet to return
Member
Joined: Dec 2008
Posts: 132
Likes: 0
From: Sacramento, CA
SL500
charged before storage,then hook up
http://www.harborfreight.com/cpi/cta...emnumber=42292
it works great.
http://www.harborfreight.com/cpi/cta...emnumber=42292
it works great.
Senior Member
Joined: Jan 2009
Posts: 337
Likes: 0
From: Montrose, CA
2007 SL550
For those of us who don't have electrical outlets in garages (the joys of living in an apartment) does anyone have any product recommendations? Are solar chargers really that useful? Etc. Etc.
Thanks in advance,
Michael
Thanks in advance,
Michael
Member
Joined: Dec 2008
Posts: 244
Likes: 1
From: Louisiana
2005 SL500
Rook
Member
Joined: Jul 2008
Posts: 213
Likes: 31
From: SW Florida
1995 SL500 - 2017 AMG GLC 43
