How to rejuvenate a lead acid battery

Written by bretn
  • Share
  • Tweet
  • Share
  • Pin
  • Email
How to rejuvenate a lead acid battery
Lead sticking to the positive plates in a lead acid battery prevents it from working. (batterie image by Ewe Degiampietro from

A lead acid battery is, most commonly, a 12 volt battery with a series of six cells. Each cell contains a positive lead oxide plate and a negative lead plate and is filled with a solution of sulphuric acid. As the battery discharges, the positive plate reacts with the sulphuric acid and produces lead ions in the water. The lead ions combine with the sulphate ions in the sulphuric acid to form lead sulphate. As the lead sulphate coats the plates, the battery is less effective and will eventually fail. Treating the battery with an acid called EDTA will remove the sulfating and prevent future sulfating.

Skill level:

Other People Are Reading

Things you need

  • Ethylenediaminetetraacetic acid (EDTA)
  • Teaspoon

Show MoreHide


  1. 1

    Add a rounded teaspoon full of EDTA to each cell in your battery. This figure works for an average-sized battery, but it is not critical to get an exact amount.

  2. 2

    Agitate the battery frequently for the next couple of days and use the vehicle regularly. Do not charge the battery completely during this time.

  3. 3

    Charge the battery thoroughly after a couple of days. You should see increased performance from this point on, as the EDTA frees the plates of lead sulphate that has been coating the plates.

Tips and warnings

  • Treating the battery with EDTA is most effective when the battery spends long periods of time not fully charged, as there are more lead ions.

Don't Miss

  • All types
  • Articles
  • Slideshows
  • Videos
  • Most relevant
  • Most popular
  • Most recent

No articles available

No slideshows available

No videos available

By using the site, you consent to the use of cookies. For more information, please see our Cookie policy.