Something a lot of people don't mention is that if you have excessive corrosion, you might want to look into why.
Your battery could have a short in one cell and the alternator is incessantly trying to bring it up to a voltage it never reaches (which is also hard on the alternator), or alternator voltage regulator is toast, or either the battery had a factory defect in the seal around the terminal, or too much cross-load was put on it when the battery clamps were installed so there's a crack and it vents there instead of where it's supposed to... in this latter case, you might try putting some paint, wax, or epoxy around the the base of the terminals where they meet the plastic to seal that, before you put something oily on it that interferes with adhesion.
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Your battery could have a short in one cell and the alternator is incessantly trying to bring it up to a voltage it never reaches (which is also hard on the alternator), or alternator voltage regulator is toast, or either the battery had a factory defect in the seal around the terminal, or too much cross-load was put on it when the battery clamps were installed so there's a crack and it vents there instead of where it's supposed to... in this latter case, you might try putting some paint, wax, or epoxy around the the base of the terminals where they meet the plastic to seal that, before you put something oily on it that interferes with adhesion.
Thank you!