How To Charge An Old Battery. At its most basic a car battery is constructed of alternating plates of dissimilar metals usually lead and lead oxide Pb and PbO 2 in an electrolyte bath usually sulfuric acid H 2 SO 4 in water. It would most likely take you a day or more to build up the batterys charge at that rate.
The acetylsalicylic acid from the aspirin will combine with the battery acid and increase the charge in the battery and the water will help restore the electrolyte in the battery. Then unplug the charging device from the power source. As soon as the battery becomes warm disconnect the batteries immediately.
If you have a battery that is reading below 11 volts t.
STEP 5 Prepare a baking soda and water solution with a ratio of 21 or 1. Your battery shoudnt be lower than 118v 30 in open circuit. Answer 1 of 8. You may need to charge the battery the rest of the way as normal then try to.
