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Off-Topic: Car Battery Corrosion on Battery Hold-Down Bracket

D107
D107 Member Posts: 1,798
edited May 10 in THE MAIN WALL
Have a 6 year old fine-working Interstate MTP-35 battery in my 2012 Nissan Sentra. Just had it inspected and oil filter-lube etc. I looked at my battery afterwards and while I was easily able to clean off most of the corrosion powder from the negative side, the powder under the bracket concerns me as my guess is somewhere along the line a service attendant must have overtightened it possibly causing a leak--which I wouldn't want to mess with.
However I think the fact that the white powder appears on the right side of the bracket only--the same side as the powder was on the negative terminal could mean that the dust migrated by wind or vibration. If that's the case, it might be worth cleaning and see if it returns. Any thoughts?





Comments

  • STEVEusaPA
    STEVEusaPA Member Posts: 5,689
    I’d take the bracket off, wire brush wipe down anything affected, put it back together, check it in a few weeks.
    steve
    D107PC7060
  • D107
    D107 Member Posts: 1,798
    Makes sense @STEVEusaPA except as with some rusted fixtures in the plumbing and HVAC fields, sometimes the corrosion is the only thing holding everything together, and looking at that bracket again I wonder if removing it will uncover a gaping leak that I won't be able to handle myself.
  • mattmia2
    mattmia2 Member Posts: 5,522
    Electrolyte leaked out either around a terminal or a cap or someone splashed some while removing the caps to check the level. It isn't leaking because of damage but it is leaking a little, hose it off with some baking soda every once in a while.

    I'd clean and paint where it is corroded.
    D107
  • Zman
    Zman Member Posts: 7,330
    edited May 10
    I don't think I have had a car battery last much longer than 6 or 7 years. If I was going to take the time to pull it apart and clean it, I would just replace the battery.

    I cracked battery is pretty rare unless it loses charge and freezes.
    "If you can't explain it simply, you don't understand it well enough"
    Albert Einstein
    D107MaxMercy
  • bburd
    bburd Member Posts: 332
    The best thing for that corrosion is a baking soda solution, but don’t get any of it inside the battery since it will neutralize the acid.

    Bburd
    D107CLamb
  • Jamie Hall
    Jamie Hall Member Posts: 18,936
    That's a maintenance free battery, so an acid spill wasn't from that battery. May have been there and going for quite some time. It's also trivial. If you don't care for the looks of it, take the bracket off, wire brush it clean as has been said, if you're really finicky get some black gloss RustOleum and spray it down. Clean up the threads on the J hook and lube them (don't drop the J hook -- easy to do and hare to undo!).

    There won't be a leak under that, If were, you'd know it by now (dead battery).
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
    D107DJD775
  • mattmia2
    mattmia2 Member Posts: 5,522
    That battery is not "maintenance free". If you grab and wiggle those vent caps they pull off and you can check/fill the electrolyte. It should be somewhere between the little post thing and the top of the slot. It looks like there is an oval of electrolyte that has seeped/sloshed out/been pushed out by evolving hydrogen and is on top of the battery.
  • Jamie Hall
    Jamie Hall Member Posts: 18,936
    Well, that is true. Maintenance light might be a better term. And does look as though -- on second look -- there had been a little leakage recently -- though I doubt that it is serious. Worth checking to see if the battery is being overcharged, though, if there is any leakage.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • mattmia2
    mattmia2 Member Posts: 5,522
    All "maintenance free" means is that they try to alter the chemistry a little so ti boils off a little less of the water and the give it more volume to hold more electrolyte. Ideally you would still remove the caps occasionally and check the level. "Maintenance free" usually has caps that screw in and are hidden under a label instead of that push on like the ones on this battery. Those caps are just little nylon stoppers with a vent in the top hooked together that push in like a cork in a bottle.
  • reggi
    reggi Member Posts: 183
    WHAT ↕️  @mattmia2 describes plus overfill runoff...
    @Jamie Hall has those j hooks nailed... 

    Don't forget to check the Battery Tray for damage and decay....

    One way to get familiar something you know nothing about is to ask a really smart person a really stupid question
  • D107
    D107 Member Posts: 1,798
    Thanks all. I always find that hvac guys have a wide range of technical knowledge esp for vehicles--which most of you depend on for your service areas.
  • MaxMercy
    MaxMercy Member Posts: 290
    Compared to some of my cars, that looks pretty benign actually. I'd just get a bucket of water and add some baking soda to it. Pour it on and use a paint brush to brush it clean, then rinse.

    My Mazda is tough on batteries, but it runs about 14.5-14.7 charging voltage, so I suspect it out-gasses a bit. It always seems to have fuzz growing on it. I replaced the alt several years ago and that one runs on the high side as well. Supposedly, the PCM controls the regulator in this model.