How to Determine the Sulfuric Acid Amount in a Forklift Battery

Written by dale yalanovsky
  • Share
  • Tweet
  • Share
  • Pin
  • Email
How to Determine the Sulfuric Acid Amount in a Forklift Battery
You can test forklift batteries with a hydrometer. (forklift and pallets image by timur1970 from

A forklift battery is a lead acid battery that is constructed much like automotive and truck batteries. It uses sulphuric acid to activate the cells of the battery and provide electrical current. The sulphuric acid can be tested using a standard battery acid tester which is also known as a "hydrometer." This test will give you the specific gravity of the acid inside of the battery, which will allow you to calculate how much voltage you have left. Since there are many variations and voltages of forklift batteries, hydrometer readings may vary.

Skill level:

Other People Are Reading

Things you need

  • Battery acid tester

Show MoreHide


  1. 1

    Open the battery storage compartment on the forklift. Remove a cap from one of the forklift battery cells.

  2. 2

    Insert the acid testing hydrometer into the cell and push in the bulb at the top. Slowly release pressure on the bulb; battery acid will be drawn into the hydrometer.

  3. 3

    Pull the battery acid tester out of the cell and read the specific gravity. Markings will be located on the side of the hydrometer. A common specific gravity reading will be 1.265 for a fully charged cell, and 1.13 or less for a completely discharged cell. These figures may vary from battery to battery, but they are a good baseline to work with.

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.