273 Reviving Laptop Batteries _ So Do It Yourself

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Reviving Laptop batteries

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Here is a way to revive your old battery pack. Usually the laptop battery is the first part to break.

On older laptops a new battery pack can cost more than the PC itself, so buying a new one is no

option.

I have had different results with different battery packs, but the usual is a 50-70 % increase in time running on

batteries. My personal experience is that NiMh batteries are much easer to rejuvenate than LiIon.

There are no guarantees and you might end up destroying your Battery pack. It might even explode, so continue

at your own risk.

Step 1 - Drain the battery

Remove the AC adapter and let it run until the battery is completly empty. You can turn off all power saving

features to speed things up. When it goes in to sleep mode, try to turn it on until you get no response at all.

Step 2 - Drain the battery even more

Using a low wattage 12v lamp (car brake light for example), you can empty the battery pack even further. Check

the voltage of your battery pack, and use a lamp with a suitable voltage. Remember not to use a lamp with too

high wattage as this could damage your batteries. Also, be careful not to short circuit. You will need to figure out

where the ground and + voltage is. On this IBM thinkpad batterypack they are located on the opposite corners

in the connector.

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Paperclips are ideal to connect the lamp to the battery connector.

Let the lamp shine until you see it going slightly dimmer. It is important not to drain it too much (especially Li-

Ion).

If you are the cautious type, you can hook up a multimeter and measure the voltage. I usually don’t like to

bother, but you can calculate how much you can drain (Skip if if you don´t care that much):

For example if your battery has 9,6 Volts printed on it:

9,6 / 1,2 = 8 cells

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8 x 0,6 = 4,8 V.

So, it’s safe to drain this 9,6 V pack to 4,8 V.

Step 3 - Recharge

Now it’s time for the for the fun part. I like to log just about everything to track the results. If you like that too,

just download and run apmmowin before inserting the battery. The output can be redirected to a file like this:

apmmowin > cycle1.txt

Recharge to 100%, and repeat from Step 1.

Results

For this article i have used apmmowin to log the results. The graph below shows the increase in battery time from

50 minutes to 2 hours and 41 minutes:

These results are from four cycles with a IBM Thinkpad R40 9.6 V Ni-Mh battery pack.

Before the discharge / Recharge cycles the battery time fell drastically from 60% to 10%. Afterwards the drop

has dissapeared and the discharge rate is much more constant.

This entry was posted on Thursday, November 23rd, 2006 at 6:08 am and is filed under Computers, Electronics. You can follow

any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

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76 comments to “Reviving Laptop batteries”

1. Comment by karl: Friday, November 24th 2006 at 4:02 am

I think I rode something like this before, they use it I remember to rejuvenate the batteries on

communication satellites, (they allso need those as their orbits make them pass through the shadow of the

earth).

great idea!

2. Comment by Odaiba Net 18 « Hablamos de electrónica y tecnología: Friday, December 1st 2006 at 6:08 pm

[...] Rejuvenecer baterias de laptops [...]

3. Comment by Mark: Sunday, December 10th 2006 at 5:51 pm

Hey,

It worked like a chram and I thank you!! I used it on an IBM also and it was my wifes; she thanks you

even more than I do!! You can take this one for what you will but the end result is “IT WORKS”

Thanks much

Mark

4. Comment by Harry: Friday, December 15th 2006 at 6:34 am

@Mark

Thanks for the nice post, however it is different from battery to battery how well it works. Some you just

can’t revive while others get 80 % more battery time.

Give my regards to your wife

5. Comment by Kenneth: Monday, January 29th 2007 at 9:56 am

Thx man. I got it in the fridge now hope it works

6. Comment by Anton: Saturday, February 17th 2007 at 3:08 am

Hi i was wondering if this would be ok to do on my powerbook g4’s LiIon battery, i read on some post

that draining this type of battery would cause a permanent damage as to not be able to recharge past that

low point.

7. Comment by mr2000jp: Wednesday, March 28th 2007 at 6:30 am

i know that this is good for the ni-mh and older batteries , but the li-ion batteries doesnt get better this way

,

8. Comment by hooyator: Monday, May 21st 2007 at 12:16 pm



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9. Comment by Mario: Wednesday, June 6th 2007 at 10:50 pm

would this work if my battery has a 10 min charge?

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11. Comment by brasays: Sunday, December 16th 2007 at 7:28 pm

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12. Comment by Chris Jones: Wednesday, February 20th 2008 at 12:10 am

I’m not sure that I believe this procedure. The calculations used 1.2V as the voltage per cell but with

lithium batteries, it should be more like 3.6V per cell (but often they connect pairs of cells in parallel for

more current). Lithium cells don’t like being deep discharged, so the only benefit I can see to this

procedure might be if the software or electronics got some stupid idea about the state of the battery.

13. Comment by aldar: Friday, April 18th 2008 at 5:23 pm

dear sir/ thankfull for Explaine but need if can help me h have Panasonic toughbook CF-48 but have no

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14. Comment by Paper Clip Uses: Friday, April 25th 2008 at 2:50 pm

What a great tip! Another good use of the paper clip as a computer maintenance accessory.

15. Comment by donover: Saturday, May 3rd 2008 at 9:33 pm

what is kenneth’s reference to the refrigerator about? Is there a refrigeration step?

16. Comment by davee42: Tuesday, September 9th 2008 at 4:13 pm

Someone told me that you can rejuvenate a laptop battery by putting it in a deep freeze overnight and then

charging it up normally. I haven’t tried this yet myself. I have a Li-ion battery so it seems the deep

discharge-recharge cycling will probably not work on it. Any comments on this deep freeze idea?

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28. Comment by Gene: Saturday, July 11th 2009 at 5:00 pm

System reponded well. Thanks for sharin g this tip.

29. Comment by computers for less: Thursday, July 23rd 2009 at 2:47 am

Great idea! I think I am going to try this on my HP before buying a new battery. It currently lasts for 6

minutes before it shuts downs. Maybe I can turn 6 minutes into 30 minutes.

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34. Comment by Rob: Monday, October 12th 2009 at 9:43 pm

Can anyone confirm this works on Li-ion batteries? Surely this is a bad idea as li-ions will be rendered

useless if taken too low, and in a series pack without monitoring each cell individually during the discharge

this is likely to happen.

I can see this could help balance the pack, which could improve its overall capacity. If this is the case, i’d

recommend discharging each cell individually, monitoring its voltage, not letting it drop below 2.5 volts per

cell.

This article appears to be written with NiMh batteries in mind, but don’t want to dissuade anyone who

wants to experiment.

Charging Li-ion batteries in a possibly damaged state or without a BMS (battery management system)



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35. Comment by Mike: Wednesday, November 4th 2009 at 1:17 am

The freezer trick is for a battery that has an internal short due to metallic crystal growth that happens over

time with charging. Eventually, you may get metallic crystals form a bridge between electrodes of a cell

which turns it into a short circuit - doesn’t give power and doesn’t take a charge.

By putting a battery in the freezer, it is HOPED that the physical contraction of differing materials will

fracture these metallic bridges and allow the cell chemistry to operate again. If this doesn’t happen in the

freezer, then I’ve heard you should try smacking the frozen battery pack against a hard surface so the

shockwaves do the fracturing.

With multiple cell battery packs, you can’t really tell the right thing to do - as each cell could have its own

problems that require different treatment - so whatever you try should be done with care and low

expectations.

But, you will either (1) Be successful (to varying degrees) (2) Make no difference or (3) Make worse or

TOTALLY kill your battery pack.

The deep cycle technique (described by the OP) is quite good if applied to the right battery in an

appropriate condition - but it’s no silver bullet and still requires a bit of care to do it right.

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273 Reviving Laptop Batteries _ So Do It Yourself