Changing battery

**SLKman** · 01-11-2007

Was reading where a fella changed his battery and his car ran bad due to computer shutting down.

My son had to change his battery but did not want to loose his preset radio stations so here is what we did. (course his battery was not completely dead, just too low to turn the car over. It just "clicked".)

I would guess it would work for SLK's also...???

We clamped jumper cables to his Battery cables and jumped to one of our other cars.

Disconnected the old battery, removed it, and put in the new Battery.

Reconnected the battery cables to the battery and removed the jumper cables.

SLKman

**etyu** · 01-11-2007

I think there's an adapter with 9v battery attached that goes unto the cigarette lighter. This allows you to change the battery without losing radio settings. (I don't know if the key has to be left on off or in position 1 -- in MB no power goes to the cigarette lighter when the key is at off or position 0).

Your method as described should work also.

**DansSlk** · 01-11-2007

Hey,

The method you posted for the 170 will work SLKman but its not a great idea to jump a modern car unless you have to and i can assure you nothing will fail or go bad on the car from disconnecting the battery you will just need to reset a few things and the instructions for them will be in the manual so if you do need to swap the battery out you can do so and totally disconnect the car from power it will be fine.

Not sure about Eddy's system it will work on the 170 but i am not really sure about the 171 for a total flat i don't think 9V will be enough what you can do for both cars if you need to is take another 12V battery and connect it to the charge points under the hood then disconnect the old battery and replace it once thats done simple unhook the second battery and jobs done.

**etyu** · 01-11-2007

Quote:

Originally Posted by DansSlk

.....for a total flat i don't think 9V will be enough what you can do for both cars if you need to is take another 12V battery and connect it to the charge points under the hood then disconnect the old battery and replace it once thats done simple unhook the second battery and jobs done.

Thank you vey much mate for the excellent tip.

**DansSlk** · 01-11-2007

Quote:

Originally Posted by etyu

Thank you vey much mate for the excellent tip.

Glad to help mate.

Just a few thing's i should have added do this with the computers off so open the hood and have everything ready then let the car sit for about 5 mins then do the job that way the car will be shut down for the duration of the operation, also once the second battery is hooked up disconnect the battery to be removed as quick as possible. (Only use this trick when you are replacing the battery)

**DansSlk** · 01-11-2007

One more trick.

Most new battery chargers need feedback from the battery they are charging so they know its starting voltage to avoid over-charging, if the cars battery is flat and your charger throws an error saying there is not sufficient charge in the battery to start the charge hook up a second battery in line with the charger so you have charger-second batt-dead batt.

This will trick the charger into thinking these is more juice left in the dead than there actually is and it will start to charge but check the condition of the dud every 5 mins or so and once its got enough charge remove the second battery from the loop

**etyu** · 01-11-2007

Quote:

Originally Posted by DansSlk

One more trick.

Most new battery chargers need feedback from the battery they are charging so they know its starting voltage to avoid over-charging, if the cars battery is flat and your charger throws an error saying there is not sufficient charge in the battery to start the charge hook up a second battery in line with the charger so you have charger-second batt-dead batt.

This will trick the charger into thinking these is more juice left in the dead than there actually is and it will start to charge but check the condition of the dud every 5 mins or so and once its got enough charge remove the second battery from the loop

Very COOL tip.

01-11-2007	#1 (permalink)
SLKman Founding Member Join Date: Jun 2006 Location: Houston Texas Vehicle: 2000 Copper Designo Sport Posts: 1,063 Country: Thanks: 261 Thanked 73 Times in 35 Posts	Changing battery Was reading where a fella changed his battery and his car ran bad due to computer shutting down. My son had to change his battery but did not want to loose his preset radio stations so here is what we did. (course his battery was not completely dead, just too low to turn the car over. It just "clicked".) I would guess it would work for SLK's also...??? We clamped jumper cables to his Battery cables and jumped to one of our other cars. Disconnected the old battery, removed it, and put in the new Battery. Reconnected the battery cables to the battery and removed the jumper cables. SLKman __________________ To view links or images in signatures your post count must be 5 or greater. You currently have 0 posts. 2000 SLK230 copper Designo Sport To view links or images in signatures your post count must be 5 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 5 or greater. You currently have 0 posts.

01-11-2007	#2 (permalink)
etyu Founding Member #2 / Ambassador Of Good Will Join Date: Jun 2006 Location: Orange County, CA Vehicle: 2008 SLK 55 Posts: 5,309 Country: Thanks: 384 Thanked 283 Times in 174 Posts	I think there's an adapter with 9v battery attached that goes unto the cigarette lighter. This allows you to change the battery without losing radio settings. (I don't know if the key has to be left on off or in position 1 -- in MB no power goes to the cigarette lighter when the key is at off or position 0). Your method as described should work also. __________________ *Eddy* To view links or images in signatures your post count must be 5 or greater. You currently have 0 posts. Pewter/Beige, PIII package, Airscarf, Hands-Free Communication System, Lighting package Designo Black Leather Cover on e-brake handle, ( To view links or images in signatures your post count must be 5 or greater. You currently have 0 posts. Bill T), SmartTop v1.0, Kleyman 3BFM (NoRegret Custom), Green Air Filters, *Mod. R170 ant.*, EuroClear sidemarkers w/PIAA PlasmaIon lamps, chromed front & rear turn indicator lamps, PIAA SuperPlasmaGTX front parking lamps, bilateral rear fog lamps enabled.

01-11-2007	#3 (permalink)
DansSlk Dude Join Date: Jun 2006 Location: Wales Vehicle: 05 B55S (Brabus 6.1 S) Posts: 6,799 Country: Thanks: 97 Thanked 236 Times in 180 Posts	Hey, The method you posted for the 170 will work SLKman but its not a great idea to jump a modern car unless you have to and i can assure you nothing will fail or go bad on the car from disconnecting the battery you will just need to reset a few things and the instructions for them will be in the manual so if you do need to swap the battery out you can do so and totally disconnect the car from power it will be fine. Not sure about Eddy's system it will work on the 170 but i am not really sure about the 171 for a total flat i don't think 9V will be enough what you can do for both cars if you need to is take another 12V battery and connect it to the charge points under the hood then disconnect the old battery and replace it once thats done simple unhook the second battery and jobs done. __________________ One thing you will learn with German cars - If it's simple it ain't happening.

01-11-2007	#6 (permalink)
DansSlk Dude Join Date: Jun 2006 Location: Wales Vehicle: 05 B55S (Brabus 6.1 S) Posts: 6,799 Country: Thanks: 97 Thanked 236 Times in 180 Posts	One more trick. Most new battery chargers need feedback from the battery they are charging so they know its starting voltage to avoid over-charging, if the cars battery is flat and your charger throws an error saying there is not sufficient charge in the battery to start the charge hook up a second battery in line with the charger so you have charger-second batt-dead batt. This will trick the charger into thinking these is more juice left in the dead than there actually is and it will start to charge but check the condition of the dud every 5 mins or so and once its got enough charge remove the second battery from the loop __________________ One thing you will learn with German cars - If it's simple it ain't happening.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Battery Recharging	matton	Ask DansSLK	9	04-21-2008 11:58 AM
What to do when the Battery is unplugged??	SuzaFan	SLK R171 General Discussion	4	02-13-2008 06:20 AM
Flat battery	bfinn	Help and Support	3	12-14-2007 06:42 PM
Flat Battery - what to do?	mcat	SLK R171 General Discussion	5	03-10-2007 08:06 AM
Changing brakes?	dsb	Ask DansSLK	5	10-22-2006 09:56 AM

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Sponsored Links

Sponsored Links

Sponsored Links