How to refill a car battery with acid and water

Written by david sandoval
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How to refill a car battery with acid and water
To avoid having to jump start a car, check the battery electrolyte levels. (closeup of jump leads image by Katrina Miller from Fotolia.com)

A battery is a critical component in the electrical system of any car. Keeping track of the battery electrolyte level is part of the routine maintenance of any car. When a battery is low on electrolyte fluid in any of the individual cells in the battery, it will not provide enough electrical energy to start the car. To keep the battery in optimal condition, it may be necessary to periodically top up the battery cell electrolyte levels.

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Things you need

  • Safety goggles
  • Rubber gloves
  • Distilled water
  • Battery vent spanner
  • Battery acid (prepackaged solution, may be obtained at an car-parts shop)

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Instructions

  1. 1

    Loosen and remove the battery vent caps. Check the electrolyte level for each cell. If any of the cells are completely dry (lacking electrolyte fluid altogether), add battery acid to the cell until the electrolyte level reaches the bottom of the “fill” line. Replace and tighten the vent caps on any cells that were filled with acid.

  2. 2

    Fill each remaining cell with distilled water until the electrolyte level reaches the bottom of the fill line.

  3. 3

    Replace and tighten the remaining battery vent caps.

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