Acid influx - Mercedes-Benz Forum

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 22 (permalink) Old 01-04-2009, 11:55 AM Thread Starter
Cruise Control
 
Zeitgeist's Avatar
 
Date registered: Sep 2004
Vehicle: '87 300TD/'90 300D/'94 Quattro/'89 Vanagon TDI/'01 EV Weekender VR6
Location: Cascadia
Posts: 51,730
Mentioned: 6 Post(s)
Quoted: 1428 Post(s)
Lifetime Premium Member
(Thread Starter)
Acid influx

Yikes, I did a really bone-headed thing last night. The battery died on my Audi, so I put it on the charger at the 35 amp setting, then promptly forgot the whole thing and let it sit overnight. I just went out there and smelled sulfur pretty strongly. The battery sits under the rear seat and there was steam and hissing coming out from under there. I'm a bit freaked out, 'cause there's moisture all over the under seat area, which also houses most of the car's ECUs and such. I think I should try to discharge the battery before I disconnect the cables, but I'm afraid to turn the ignition on with all that moisture and overvoltage. It really looks like that thing could blow at any moment. I'm thinking of neutralizing the moisture/acid(?) with baking soda. Any thoughts or experience with this?
Zeitgeist is offline  
Sponsored Links
Advertisement
 
post #2 of 22 (permalink) Old 01-04-2009, 12:02 PM
~BANNED~
 
Date registered: Sep 2004
Vehicle: 2002 clk320
Location: Lancaster, Kentucky
Posts: 8,498
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Zeitgeist View Post
Yikes, I did a really bone-headed thing last night. The battery died on my Audi, so I put it on the charger at the 35 amp setting, then promptly forgot the whole thing and let it sit overnight. I just went out there and smelled sulfur pretty strongly. The battery sits under the rear seat and there was steam and hissing coming out from under there. I'm a bit freaked out, 'cause there's moisture all over the under seat area, which also houses most of the car's ECUs and such. I think I should try to discharge the battery before I disconnect the cables, but I'm afraid to turn the ignition on with all that moisture and overvoltage. It really looks like that thing could blow at any moment. I'm thinking of neutralizing the moisture/acid(?) with baking soda. Any thoughts or experience with this?
Let it sit for a few days and everything will be alright, Trust me I know.
the clk man is offline  
post #3 of 22 (permalink) Old 01-04-2009, 12:18 PM Thread Starter
Cruise Control
 
Zeitgeist's Avatar
 
Date registered: Sep 2004
Vehicle: '87 300TD/'90 300D/'94 Quattro/'89 Vanagon TDI/'01 EV Weekender VR6
Location: Cascadia
Posts: 51,730
Mentioned: 6 Post(s)
Quoted: 1428 Post(s)
Lifetime Premium Member
(Thread Starter)
Unfortunately, that's not an option. I have to move the car so the construction guys can work on my shop. Thankfully, it appears that the moisture under the seat is in fact just condensation and not acid--wheeiuwww!
Zeitgeist is offline  
post #4 of 22 (permalink) Old 01-04-2009, 12:26 PM
BenzWorld Elite
 
Smackrattle's Avatar
 
Date registered: Nov 2005
Posts: 12,542
Mentioned: 0 Post(s)
Quoted: 216 Post(s)
Quote:
Originally Posted by Zeitgeist View Post
Yikes, I did a really bone-headed thing last night. The battery died on my Audi, so I put it on the charger at the 35 amp setting, then promptly forgot the whole thing and let it sit overnight. I just went out there and smelled sulfur pretty strongly. The battery sits under the rear seat and there was steam and hissing coming out from under there. I'm a bit freaked out, 'cause there's moisture all over the under seat area, which also houses most of the car's ECUs and such. I think I should try to discharge the battery before I disconnect the cables, but I'm afraid to turn the ignition on with all that moisture and overvoltage. It really looks like that thing could blow at any moment. I'm thinking of neutralizing the moisture/acid(?) with baking soda. Any thoughts or experience with this?
Shart?

Over-voltage is a danger from a faulty alternator/rectifier. Each cell of the battery has an absolute maximum output of about 2.15 volts, irrespective to how much/long it has been charged.

You do however want to avoid any ignition source in the vicinity of the battery until it has finished gassing and cooled. Hydrogen/air at certain ratios is spectacularly explosive.

The condensate is almost certainly acidic* - taste each patch of it it. Make up a solution of bicarbonate of soda and sponge the whole area thoroughly. If left, the concentration of the acid increases as the water evaporates.

The battery may well be toast. Is it possible to determine the level of electrolyte left in it?

*On reflection, I think 'sealed' batteries have a system to retain H2SO4 fumes, but taste the damp patches anyway.

"Religion is regarded by the common people as true, by the wise as false, and by the rulers as useful" - Seneca

Last edited by Smackrattle; 01-04-2009 at 12:32 PM.
Smackrattle is offline  
post #5 of 22 (permalink) Old 01-04-2009, 12:36 PM Thread Starter
Cruise Control
 
Zeitgeist's Avatar
 
Date registered: Sep 2004
Vehicle: '87 300TD/'90 300D/'94 Quattro/'89 Vanagon TDI/'01 EV Weekender VR6
Location: Cascadia
Posts: 51,730
Mentioned: 6 Post(s)
Quoted: 1428 Post(s)
Lifetime Premium Member
(Thread Starter)
Well, the only reason I thought that it wasn't acid, is that it didn't fizz when I sprinkled baking soda on it. You're right, it no doubt is acidic. I dropped some soda on the top of the battery and that stuff went berzerk. Frankly, I'm scared to even get close that the boiling hissing tinderbox right now. That battery is a goner, for sure. The fuckin' car smells like an outhouse, too.

Whudda dumbshit
Zeitgeist is offline  
post #6 of 22 (permalink) Old 01-04-2009, 12:57 PM
BenzWorld Elite
 
Smackrattle's Avatar
 
Date registered: Nov 2005
Posts: 12,542
Mentioned: 0 Post(s)
Quoted: 216 Post(s)
I'm surprised your charger delivers 35 amps for charging. Did you borrow it from TK?? Are you sure that's not the cranking 'boost' setting? 10 amps is considered high for a car battery, with 3-5 amps recommended under most circumstances. At 35 amps you are delivering just about 500 watts. Think of the heat produced from 5x 100 watt bulbs.

"Religion is regarded by the common people as true, by the wise as false, and by the rulers as useful" - Seneca
Smackrattle is offline  
post #7 of 22 (permalink) Old 01-04-2009, 01:04 PM Thread Starter
Cruise Control
 
Zeitgeist's Avatar
 
Date registered: Sep 2004
Vehicle: '87 300TD/'90 300D/'94 Quattro/'89 Vanagon TDI/'01 EV Weekender VR6
Location: Cascadia
Posts: 51,730
Mentioned: 6 Post(s)
Quoted: 1428 Post(s)
Lifetime Premium Member
(Thread Starter)
It's a big charger. Has a 35amp "fast charge" and a 200amp "start mode". Imagine if I'd left it on in the latter setting--wowza, that would be a mess! I should've used the 2amp trickle mode. I really need to step up to the models with a built in timer.
Zeitgeist is offline  
post #8 of 22 (permalink) Old 01-04-2009, 01:31 PM
BenzWorld Elite
 
Jayhawk's Avatar
 
Date registered: Aug 2005
Vehicle: S500/W220/2000
Location: Lawrence, KS (USA)
Posts: 21,652
Mentioned: 0 Post(s)
Quoted: 3 Post(s)
Here's a possible solution...


Don't believe everything you think
Jayhawk is offline  
post #9 of 22 (permalink) Old 01-04-2009, 01:34 PM
Moderator
 
gerkebi's Avatar
 
Date registered: Oct 2005
Vehicle: 107, 115, 116, 123, 124, 126
Location: E-I-E-I-Ohio
Posts: 5,920
Mentioned: 1 Post(s)
Quoted: 0 Post(s)
I've done the same thing. I fried one overnight at regular charge in my MG (actually two, it takes two 6v in series. What a friggin' mess.)

You're doing the right things now...baking soda everywhere, scrub it in good. I'd take the battery out as soon as things calm down, clean everything up good and dry and put a new one in. Wear latex gloves (I get them by the box at Rite Aid.) Don't forget to find your radio code.
gerkebi is offline  
post #10 of 22 (permalink) Old 01-04-2009, 02:08 PM
Surely A Large Human
 
Qubes's Avatar
 
Date registered: Jun 2006
Vehicle: '08 C219
Location: Between Earth and Mars
Posts: 34,253
Mentioned: 2 Post(s)
Quoted: 493 Post(s)
Lifetime Premium Member
Quote:
Originally Posted by gerkebi View Post
I've done the same thing. I fried one overnight at regular charge in my MG (actually two, it takes two 6v in series. What a friggin' mess.)

You're doing the right things now...baking soda everywhere, scrub it in good. I'd take the battery out as soon as things calm down, clean everything up good and dry and put a new one in. Wear latex gloves (I get them by the box at Rite Aid.) Don't forget to find your radio code.
....




Anything else you want to share with us?
Qubes is online now  
Sponsored Links
Advertisement
 
Reply

  Mercedes-Benz Forum > General Mercedes-Benz Forums > Off-Topic

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Mercedes-Benz Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











  • Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
     
    Thread Tools
    Show Printable Version Show Printable Version
    Email this Page Email this Page
    Display Modes
    Linear Mode Linear Mode



    Similar Threads
    Topic Author Forum Replies Last Post
    Citric Acid Denver W126 S,SE,SEC,SEL,SD,SDL Class 11 09-13-2008 07:40 AM
    Acid flashback ThrillKill Off-Topic 2 02-18-2007 10:12 AM
    Acid Testing for the E-Class Curacao W211 E-Class 2 06-23-2006 09:38 AM
    Acid rain 420 SE Detailing and Car Care 18 10-24-2005 02:06 PM
    stains, acid rain? jmgnunez Detailing and Car Care 4 12-19-2003 12:43 AM

    Posting Rules  
    You may post new threads
    You may post replies
    You may not post attachments
    You may not edit your posts

    BB code is On
    Smilies are On
    [IMG] code is On
    HTML code is Off
    Trackbacks are On
    Pingbacks are On
    Refbacks are On

     

    Title goes here

    close
    video goes here
    description goes here. Read Full Story
    For the best viewing experience please update your browser to Google Chrome