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Knowledge Base : Frequently Asked Questions : Large/RV/Marine Batteries FAQ : When Should I Add Extra Sulfuric Acid to my Battery?

When Should I Add Extra Sulfuric Acid to my Battery?

When you see your battery acid level begin to drop, you may wonder when and if it is appropriate to add acid, or just water.

We recommend that unless a battery was tipped over and all the acid spilled out, that you add only distilled water. Think of it like this: If you were to fill a pot up with salt water, and put it on your stove to boil, what happens? All the water will boil off, and you will be left with only salt. To re-create the original salt water mixture, you simply add straight water, because all the original salt is still in the pan, waiting to be re-suspended in the water. Batteries are the same way. All the chemical needed to make sulfuric acid is still in the battery, it is just the water that is gone. If you add more acid, you will be changing the chemical makeup of the battery which can lead to an incorrect sulfuric content.

2 Responses

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  • what to do if some qty. acidic water spilled out? How to regain the quantity of acid that spilled out?

    May 15, 2014 a 5:57 am
    • It is impossible to do so accurately. We do not recommend adding anything other than distilled water.

      May 16, 2014 a 2:18 pm
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