resurrecting a dead car battery? anyone try this?

[Rusty Heap]

went to a tech review of this product at a local cycle shop. Military and State patrols use these..............they basically put out a over-voltage pulse, to get the lead plates from oxidizing (which is the sole fact about why a lead plate battery doesn't produce, or hold a charge anymore, too much internal resistance)

anyone use one of these?

XtremeChargers.com | 12V Smart Battery Maintenance Chargers

[sc_rufctr]

Originally Posted by URY914

I was told by an old gas station owner that you should drop the battery from about 12" off the ground before charging. It knocks the crap off the lead cells. I don't know if the old guy was right or if it's BS but I've been doing it for years.

That's interesting. So what results have you got?

[URY914]

Originally Posted by sc_rufctr

That's interesting. So what results have you got?

Well there is no way to tell if it works or not. So I do it anyway.

[Z-man]

Originally Posted by URY914

Well there is no way to tell if it works or not. So I do it anyway.

It can help with a DME relay - tapping it lightly on the ground may dislodge enough of the carbon build-up to allow the car to start.

Sometimes, it doesn't work.... ask me how I know.

-Z

[Joeaksa]

Use a good charger, one that "desulfates" the battery as well as charges it. Costs about $100 or more but its worth it. Battery from the plane is on one right now.

[charlesbahn]

Have to really careful fooling around with dead or dying batteries. If you have one that develops an internal short, if will begin to heat up and if you aren't there to turn off the charger, it just keeps trying to charge, getting hotter and hotter and hotter and hotter....

This is a particular danger in boats where multiple high amp hour 6V golf cart batteries are hooked up and usually unattended. A battery develops an internal short and the other batteries keep feeding it until it explodes or melts.

Please be careful!

[71T Targa]

Another question about bringing a battery back from the dead;
If you jump start the car, will the alternator change the 'dead' battery, or will it work the same as the battery charger?

Or is it if the alternator wont charge it, neither will the method described here?

[rick-l]

Originally Posted by 71T Targa

Another question about bringing a battery back from the dead;
If you jump start the car, will the alternator change the 'dead' battery, or will it work the same as the battery charger?

Or is it if the alternator wont charge it, neither will the method described here?

If the battery is good the alternator will charge the battery at about 60 amps so it will take a while for a 90 amp hour battery.

There is an old wives tale the alternator will burn up if it puts out its rated current.

[71T Targa]

I jumped the car, and ran it for a couple of hours.
After that the battery was still dead.
It really is dead? It should have taken some charge during the drive?