Car Starter Battery Testing and Rejuvenation
Testing: A good battery charges to around 12.4 volts
A bad battery holds at 12.2 volts or less and may crank car but will generally not hold a charge. If your battery is below 10v it is considered empty.
12.4 or better volts
 Charged should crank car.
12.2 volts
 May crank car but will not hold charge.
10 volts
 Battery is Considered Empty

Charging test:
An alternator should put out between 13.5 and 15 volts of power. The alternator should be tested with the engine idling and electrical accessories, such as the radio and headlights, turned off.

Cranking Load Testers.  *****
Used for diagnosing if you possibly have a starter issue.

Voltmeter More Info or purchase
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Epsom Salts



This "may" rejuvenate your battery or at least give your battery enough cranking power to start your car started in order to get to the battery store.
Disclaimer: If your are not familiar with working with batteries do not
attempt this without further instruction or have a trained professional
do this for yourself.
More involved Process at this link.
 
Quick Fix

Make a Super Saturated Soluton.
  • Heat 1/2quart of distilled water to 66 degrees Celsius. We do this to ensure all salts are dissolved later while mixing.
  • Dissolve 7 to 8 ounce of Epsom salt into the warm distilled water and stir until completely dissolved.
Empty battery solution to top of plates using a suction device ie a baster or syringe.
Fill to normal level with super saturated solution as per above.
Trickle charge over night.

Anecdotally>>> "A guy at work was telling me that he keeps his trolling motor batteries alive for years using a mixture of epsom salt and distilled water. The mix he uses is ten heaping tablespoons to one quart of water.

I was thinking, 'well...maybe' until he mentioned that he drains the liquid out of the battery to start with. I asked him if he meant that he uses this stuff as the electrolyte. (Am I using the right term there?) He didn't seem to know what the word meant. Anyway, though, it's clear to me that he's using this stuff as the liquid between the plates of a battery.

He tells me that he doesn't know how long it'll last since he just changes it yearly. And he said that he's brought batteries back from the dead with this stuff."

Epsom salt is magnesium sulphate - MgSO4. Its no different electrolytically than sulphuric acid - H2SO4. There is a possibility that there will be some MgO salts being deposited on the plates, but essentially instead of H+ ions moving around, you have Mg2+ ions moving.







Patended Battery Additives






Borax and Lye