My laptop's battery has died, It's lithium-ion type.

[background]I let my laptop's in a shelf for a long, long time and the battery was drained: when I realized it was dead.

Fortunately, all that had to be done was to replace the damaged cells
If you ever wanted to repair a laptop battery, make sure that the battery is the real problem

The laptop must turn on when plugged to the wall adapter, even without a battery
The battery must have worked in the past, and its useable time must have decreased over time
The laptop must recognize the battery or say that it is "charging it"

Failure to meet those, and maybe other, requirements might mean that there is another problem besides or instead of the battery.

Now I will give you the simple instructions of this simple process. You can, however, harm your computer (if you don´t use the appropiate batteries) and even yourself (if you short-circuit anything) I cannot be held responsible since I am telling it to you right now: do not try this if you aren't completely sure about it.

If you feel ready, then check the following information:

Is your battery Lithium-ion type?
Which is your battery's voltage (mine is 14.4v)
Which kind of smaller units does your battery use?

Divide the voltage of you battery between 3.6. The result must match or double (I haven´t seen a case, but might triple...) the number of smaller units inside of your battery (I had 14.4/3.6= 8). If your numbers aren´t as I described, there is something wrong, re-check if you have li-ion type batteries

Is everything allright? Now get the following materials

A cutter
A hammer
Adhesive Tape
Voltimeter - Multimeter

You must split open the battery. Locate where the battery can safely be taken appart, place the tip of the cutter there
Gently hit the blunt side of the cutter with the hammer. DON'T LET THE TIP OF THE CUTTER TO GO DEEPER THAN 1CM! you will damage the battery. Keep going until you have opened the battery. Be careful, you don´t want to damage the battery':s mainboard.
Make a drawing of what is in the inside (specially of the smaller batteries and how they are oriented)
Use the multimeter and write the polarities in your drawing. This is how you will place the new units

You might be ready to order your new replacement units. Mine were "ICR18650 2200mAh 3.6V", which are commonly what should be gotten
As a side note, I found the best price at ebay, but there was a yahoo store which offered a good deal, too. Unless somewhere else stated, your new units MUST have built-in protection circuitry (because it is very likely that you won´t buy the replacements identical to the original ones).

The next step is removing the original units and placing the new ones in the exact same position and according to the exact same polarity. You might have to use the cutter and the hammer again to separate the units and the attaching plaques (which are soldered-fused to them).
Finally, assemble everything with tape. Do not use too much, tough, otherwise your "new" battery might not fit in your laptop

The result will be a fully funcional battery, like a new one, or better. You won´t want to take that to a beauty contest, however; windows won´t be able to estimate the charge of the battery, either. I´m happy with the final product: and I got a truly FRESH battery. All original batteries, though new, have passed some time in storage, and Li-ion batteries are damaged just by being storaged...

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