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The sizzling noise you hear is Hydrogen (H).

You are hearing the bubbles of it inside the battery pop.

It's normal for unsealed car batteries. Your OK, just avoid things that could ignite the hydrogen. Also, you may notice it is warm to the touch. If you are charging it, make sure your battery charger is on the correct settings and that your water level is adequate. If the level is low, (plates are exposed), add DISTILLED water to it. Not tap water, purified water or other water. It must be distilled. You can purchase distilled water at Publix, Walgreens, Walmart, Auto parts..

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Q: Why is my car battery making a frying noise?
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