Before you throw that battery in the trash...

Before you throw that battery in the trash...

1. Take a battery charger designed fow automotive applications.

2. Put a sheet metal screw in both of the automotive style charging clamps.

3. Put on a pair of safety goggles, or better a face shield.

4. Touch the battery contacts with the screws, positive to positive, negative to negative.

5. Hold for about 15 -20 seconds, MAX.

6. Attempt to complete the charge in the normal fashion, with the correct Panasonic rated charger.

I have had the above procedure rejuvenate quite a few batteries of different types! I would guesstimate over 50%! If it works and it take a usable charge, use it till it is very low, but not completely flat and recharge it as normal. Once batteries get old it is much easier for the cells to flip polarity if they are completely discharged! This is of course a problem...

No negative comments unless you have tried it, I refuse to ignore my own success with this method!

Also, if this does not work, I have a more extreme method that saves some batteries that this one fails!

 

Are you suggesting this approach for laptop batteries like say Panasonic ones?
CAP

 

Sure!

And yes, I concede that the circuit board inside may not take the extra amperage. Plus the fact that this circuit apparently measures and compares the batteries expected decrepitude and may not allow the restored function.

For what it is worth, I have done it on laptop batteries, just not for the Toughbook.

However, I have seen it work more then fail and I would not throw a old and expensive battery in the trash without giving it a try. But, then again, I am kind of hard-headled like that...

 

I second Azrial... he's not smoking something real good.. it does work.

Although when I've done it, I had the battery in the middle of my driveway and turned the power on from my house... in case the battery DOES explode.

 

Yes this does work. I have done this for years on other laptops, cordless drill batteries and even cordless shavers...read below.

YouTube - Revive Batteries

YouTube - Revive Batteries

 

Are you sure this method is suitable for Li-ion batteries?
There is only Ni-Cd in the article above.
Also it's very dangerous with Li-ion, as they are explosive.

 

I'm going to wait for a couple of credible reports of this working on a CF-29 battery. Not doubting the "Az", I'm just sayin'.
CAP

 

I will check my drill battery tomorrow and check and see what it is . I know the old Nec and Hitachi laptop battery was a Ni-Cd and it worked on them. It can't hurt to try it if the battery is no good anyways.

 

No guts... No Glory...

I have rigged it so that I could do this stunt remotely but I also admit to doing it more personally.

I have also did it with more voltage and a 1/4 amp fuse in the line to hopefully blow before the battery melts. Even if it does not work, it makes it easier for me to throw the battery away. I mean by that point, I am SURE that it is dead.

 

Just curious, but did you have any of those batteries 'explode' on you?

 

I have a MAHA MH-C777plus battery charger/analyzer that has successfully bought several CF-27 batteries from the dead. Not as crude as an auto-style battery charger & provides an LCD readout of amount of amperage taken by the laptop battery until shutoff.

 

I have not had any of mine explode. I did have a Dull that I could not bring back to life. One thing I don't do is have the battery sitting in front of me just in case it goes boom

 

I have had one, out of maybe a hundred, "pop" on me. It was no big deal. Now a automotive style battery, I have seen one of those blow a hood off a car! But I am NOT advocating this method to be used on those!

But you are not going to get a blast like that with a Ni-Cad, or even Lithium Oxide. But, there is nothing wrong with being safe, if you are concerned, it is easy to rig some clips and do it remotely.

Fire in the hole!

 

I have a Maha and it is a great little universial charger! I like the "pulse" feature.

But it clearly does not have the raw amperage that a larger "crude" style automotive charger has.