inexpensive $37 desulfator kit I finally have two working 12V lead acid battery desulfators. My neighborhood electric vehicle has two batteries which are performing badly. At the moment I'm testing one battery which was working great two weeks ago and now has a voltage of 10.6V. I found that two cells have a specific gravity of zero. I will retest the specific gravity in each cell tomorrow and see if there is any change. This battery should be able to entirely desulfate itself within 10 days. Hopefully I will be able to repair lots and lots of batteries with these desulfators.