Battery Acid around terminals on auxiliary

Submitted: Sunday, Feb 24, 2008 at 12:16
ThreadID: 54871 Views:2037 Replies:7 FollowUps:4
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I get a large build up of the acid gunk around one of the terminals on my auxiliary battery under the bonnet.

The starter batteries are clean as a whistle.

Anyone know why this happens and is there an easy preventative measure I can take?

Cheers
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Reply By: Member - Kiwi Kia - Sunday, Feb 24, 2008 at 13:17

Sunday, Feb 24, 2008 at 13:17
Some vapour / gas containing very fine droplets of battery acid may be venting around the post. Put a felt washer covered in vaseline/petroleum jelly over the post before you put on the terminal clamp.
AnswerID: 289107

Follow Up By: Member - Davidp P (VIC) - Monday, Feb 25, 2008 at 21:24

Monday, Feb 25, 2008 at 21:24
as a tip, dont use the posts to hook up a lifting strap bcause that can break the seal around the post a cause the venting
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FollowupID: 554668

Reply By: DIO - Sunday, Feb 24, 2008 at 13:45

Sunday, Feb 24, 2008 at 13:45
Yeah go the felt pad under the connectors. I also spray all exposed metal around battery with lanoline spray. Does the job for me. Also make sure that you haven't put too much water in the cells. This can also cause excessive 'splashing' of droplets etc onto terminals.
AnswerID: 289108

Reply By: Member - Doug T (FNQ) - Sunday, Feb 24, 2008 at 13:47

Sunday, Feb 24, 2008 at 13:47
Boil up the jug, put 2 or 3 teaspoons of Bi-Carb Soda in a large mug, add the boiling water and tip it over the acid build up.
Acid will desolve, wash it off with the hose and then add some of the whats in the can below.
and get a terminal cleaner

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AnswerID: 289109

Reply By: Member - Tim - Stratford (VIC) - Sunday, Feb 24, 2008 at 14:04

Sunday, Feb 24, 2008 at 14:04
Andrew,

All good advice above. My aux battery was doing this and then the starter batteries (2x on 100s) started to do this - ended up being a Aux battery on the way out. The alternator was trying to push huge amps into the system to charge a dying battery.

I cleaned everything up, replaced the aux battery and all's good.



Tim
AnswerID: 289111

Follow Up By: Brooka27 - Sunday, Feb 24, 2008 at 15:25

Sunday, Feb 24, 2008 at 15:25
My 100 series T/D Aux batt is doing the same thing.

A mate of mine was saying he goes through alot of batteries in his 79 series T/D?

Maybe there is something else going on here?
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FollowupID: 554447

Follow Up By: TD100 - Sunday, Feb 24, 2008 at 20:21

Sunday, Feb 24, 2008 at 20:21
All 3 batteries in my 100 TD are 4.5 years old and still going well,your mate must be using chite batteries.2 optimas and a 100ah gel cell (remco) have all paid for themselves.cheers Paul
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FollowupID: 554495

Reply By: Shaker - Sunday, Feb 24, 2008 at 14:07

Sunday, Feb 24, 2008 at 14:07
Use Wurth battery terminal spray, before & after you fit the terminals.
AnswerID: 289112

Reply By: Member - Mike DID - Sunday, Feb 24, 2008 at 14:49

Sunday, Feb 24, 2008 at 14:49
If liquid keeps on appearing near a battery terminal, then the seal between the battery and the case is defective.

Either that, or abnormal force has been applied to the terminal.

All you can do is apply a water repellant grease at the base of the terminal to prevent the acid migrating up to the battery clamp.

Lanolin Grease is more acid-resistant than Vaseline.
AnswerID: 289115

Follow Up By: Member - Mike DID - Sunday, Feb 24, 2008 at 15:40

Sunday, Feb 24, 2008 at 15:40
. . . . or at some time the battery clamp has come loose leaving the battery tossing around and tugging on short battery lead.
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FollowupID: 554452

Reply By: BMKal - Tuesday, Feb 26, 2008 at 04:47

Tuesday, Feb 26, 2008 at 04:47
Might be worth mentioning what type of vehicle - where is battery mounted, and what is the temperature like in that area.

Land Rover Disco 2 usual position for aux battery is on left hand side up close to the firewall. This position is known for the battery being exposed to excess heat from the exhaust / turbo (at least in the diesel), and I have read reports of batteries boiling / leaking in this position. Can be remedied by installing a heat shield between battery and the turbo in this case.

I've got a Disco 2 and looking at options for installing second battery. Have found a few reports on batteries overheating in this position - many Disco owners install aux battery in back of vehicle because of this.
AnswerID: 289414

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