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John Bedini demonstrates how to make an Alum Battery, using Alum as the electrolyte instead of Sulfuric Acid.
He takes a useless 12v Lead Acid Car Battery and converts it to an Alum Battery.
The sulfated lead plates clean themselves, and the battery restores itself, using Alum as the electrolyte, instead of Sulfuric Acid.

The advantages of the alum battery are many:

  • The battery fluid is non corrosive
  • The battery gas is not explosive
  • The battery can be discharged more deeply
  • The battery can be charged much faster
  • The battery will last longer
  • There is no corrosion of the terminals
  • It is extremely cheap
  • More power in cold weather
  • Environmentally Friendly
  • 1.75 times the storage capacity as a Lead Acid Battery
  • No memory effect for charging and discharging



John Bedini



Conversion Process
  • Make sure none on the battery cells are shorted.
  • Empty the Acid from the Battery.
  • Refill with water and Baking Soda; 1/4 cup Baking Soda & 2 quarts water (tap water will work)
    You do this to get rid of the acid and clean out the internal parts of the battery. Let it soak 30 minutes or more.
  • Empty the water and do the cleaning process again. Do this until the water comes out clear instead of gray. You want the inside clean, for best results.
  • Empty and Refill with Distilled Water. Do this a few times. You are making sure the insides are clean and free of deposits.
  • Now you are ready to add the Alum. Mix 1/4 cup of Alum powder with about a liter of Distilled water. Fill the battery; make certain the cells plates are completely covered with liquid. Another formula uses 4oz Alum to 40oz of Water (1/10 ratio).
  • Now charge the battery at a low rate , 2 to 5 amps, for a few minutes, then make sure it is taking the charge. The voltage should start increasing. Continue charging. This new alkaline battery can be discharged and charged like a Deep Cycle Battery. John Bedini has discharged his to only 1/2 a volt left in the battery. My charger works at 300 MA, 5 amps, and 8 amps.

Read responses that many experimenters have posted

  Build a Battery Desulfator



Lead Acid Conversion to Alum




How Car Batteries Work






Aluminum sulfate hydrate: Al2(SO4)314H2O
C.A.S. 10043-01-3 (Aluminum sulfate)
pH of 1% Solution (approx.) 3.5
Bulk Density (Ground), lbs./cu. ft. 63 - 71
(Powdered), lbs./cu. ft. 38 - 45
Dry Alum Assay as Al2(SO4)314H2O, % >99
Aluminum Assay as Al2O3, % 17.0 (min)
Alkalis and Alkaline Earths, % 0.22 (max)
Ammonium Salts Passes Test
Fluoride (F), % <0.0009
Lead (Pb), ppm <0.5
Selenium (Se), % <0.00005
John Bedini


    Copyright 2003   All rights reserved.   Revised: 04/23/15.                                             Web Author, daddyo44907
The information presented on this web site is for information purposes only. Should you decide to perform experiments or construct any device, you do so wholly on your own responsibility
-- Neither the company hosting this web site, nor the site designer author are in any way responsible for your actions or any resulting loss or damage of any description, should any occur as a result of what you do.