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Excessive battery terminal corrosion #4550142 10/21/17 11:51 AM
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Kestas Offline OP
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My car has developed corrosion on the positive battery terminal. The problem is that it seems excessive and needs cleaning more often than I can remember. I've had this car for 15 years. I normally don't bother with terminal coatings or felt pads, but I may have to with this car. It's a Durolast battery. What could have changed with my car to enhance this corrosion?

Re: Excessive battery terminal corrosion [Re: Kestas] #4550148 10/21/17 12:06 PM
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skyactiv Online Content
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ONE cause could be micro cracks around the battery post in which gas is escaping and causing the issue. Usually caused by improper handling.


Wife: 15' Audi A4 quattro 6 speed manual
Me: 13' VW GTI 3 door 6 speed manual
2018 Elantra Sport 6 speed manual


Re: Excessive battery terminal corrosion [Re: Kestas] #4550155 10/21/17 12:15 PM
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bubbatime Online Shocked
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These two products are what will fix your ails. WITH a green felt pad under your terminals.





2019 Honda CRV 1.5T factory bulk
2017 Chrysler Pacifica SuperTech synthetic 5W20
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2006 GMC Sierra SuperTech high mileage 5W30

Re: Excessive battery terminal corrosion [Re: Kestas] #4550158 10/21/17 12:20 PM
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I used to service a 1998 GM G3500 diesel van with a second frame mounted battery under the van and it always had a lot of corrosion on the positive terminal and I had to clean it every few months. The three other battery terminals on the van were fine. This corrosion persisted over the life of the van, through multiple battery replacements, from multiple battery sources - Delco, Costco etc. The experience seemed to rule out the usual causes - overcharging and cracked case around positive post


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Re: Excessive battery terminal corrosion [Re: Kestas] #4550159 10/21/17 12:22 PM
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In no particular order:

1) you clamped the battery too hard/right, and compromised the plastic to metal seal slightly.
2) age has worn/removed the protective coatings from the cable.
3) dirty/bad ground, including on the voltage regulator, causing more time at elevated voltages where gassing may occur.
4) bad/failing/intermittent diode that turns the alternator from a six pulse rectifier (terrible dc) to a four pulse (even worse).
5) poor quality battery
6) too cold at too low a charge at some point compromised case slightly

I always put a thin coat of dielectric grease around the metal to plastic junction and on the terminals, and then spread the grease on the top of the terminal to coat the top of the cable clamp.

Re: Excessive battery terminal corrosion [Re: George7941] #4550180 10/21/17 12:55 PM
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Originally Posted By: George7941
I used to service a 1998 GM G3500 diesel van with a second frame mounted battery under the van and it always had a lot of corrosion on the positive terminal and I had to clean it every few months. The three other battery terminals on the van were fine. This corrosion persisted over the life of the van, through multiple battery replacements, from multiple battery sources - Delco, Costco etc. The experience seemed to rule out the usual causes - overcharging and cracked case around positive post


If the parallel batteries weren't perfectly matched and replaced in pairs, all sorts of funny stuff could happen.

Re: Excessive battery terminal corrosion [Re: Kestas] #4550184 10/21/17 01:02 PM
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Donald Offline
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Your battery is a leaker. The seal between the case and post was damaged.

Felt pads may help.

Aside from it being a PIA to keep clean it does does hamper the battery being a battery.

Last edited by Donald; 10/21/17 01:11 PM.

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Re: Excessive battery terminal corrosion [Re: Kestas] #4550189 10/21/17 01:10 PM
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Donald Offline
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Who mfg the battery? Exide??


2015 Subaru Forester 2.5 engine/CVT
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2016 Subaru Crosstrek CVT (wife's)
Re: Excessive battery terminal corrosion [Re: JHZR2] #4550195 10/21/17 01:18 PM
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Kestas Offline OP
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Originally Posted By: JHZR2

2) age has worn/removed the protective coatings from the cable.

This is on my 1995 Mercedes E320. The terminal head is brass, same shape as the thick lead ones. I can't remember if it ever had a coating. After two months, the corrosion was so thick the battery brushes couldn't remove it, and I had to scrape it off like a dental hygenist.

Re: Excessive battery terminal corrosion [Re: Kestas] #4550209 10/21/17 01:35 PM
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All good info above....add short tripping to the list of things that can cause the condition.

If the integrity of the battery case is good then gluing a penny next to the positive terminal will get the corrosion on the penny instead of anywhere else.


Thick vs Thin test: 15k / 43k miles complete
Re: Excessive battery terminal corrosion [Re: Kestas] #4550242 10/21/17 02:42 PM
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Kestas Offline OP
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I just checked how old my battery is... over 8 years old! I'm going on a long trip in a couple weeks. I'm glad I caught this. This explains why it recently takes just a bit longer to crank the engine before it starts. Hopefully a new battery will cure this ill.

Re: Excessive battery terminal corrosion [Re: Donald] #4550266 10/21/17 03:27 PM
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bullwinkle Offline
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Originally Posted By: Donald
Who mfg the battery? Exide??
No, it's the awesome Johnson Controls leak fest! I had one that leaked from DAY ONE with never having a clamp put on it (dual terminal battery).

Last edited by bullwinkle; 10/21/17 03:27 PM.

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Re: Excessive battery terminal corrosion [Re: Kestas] #4550298 10/21/17 04:13 PM
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Most batteries made by East Penn (Sam's club Duracell, Napa, Meijer powercell, or Deka) have sealed tops and side vents that severely cut back on gassing and build up on terminals. Use plenty of cleaner and neutralizer and follow up with neutralizer coating or dielectric grease. If possible, a nice bath in some hot water and baking soda will help to clean and neutralize most of the acid. Make sure you really cover any exposed copper to cut back on green/blue copper sulfur corrosion.


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Re: Excessive battery terminal corrosion [Re: Kuato] #4550315 10/21/17 04:36 PM
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Originally Posted By: Kuato
All good info above....add short tripping to the list of things that can cause the condition.

If the integrity of the battery case is good then gluing a penny next to the positive terminal will get the corrosion on the penny instead of anywhere else.


Does the penny have to make contact with the post?


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Re: Excessive battery terminal corrosion [Re: Kestas] #4550318 10/21/17 04:43 PM
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Originally Posted By: Donald
Your battery is a leaker. The seal between the case and post was damaged.

This.
Originally Posted By: Kestas
I just checked how old my battery is... over 8 years old! I'm going on a long trip in a couple weeks. I'm glad I caught this. This explains why it recently takes just a bit longer to crank the engine before it starts. Hopefully a new battery will cure this ill.

Yes.

I've seen this multiple times. When the green fuzz grows crazy fast, the problem is a leaky battery, and a new battery is the real fix.


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