[Raspberry Pi Q&A, Help & Troubleshooting] -CALIBAN666-:
BIG NOTICE: IM NOT TO BLAME WHEN YOUR DEVICE GOES TO NIRVANA, FIRE, ANGRY WIFES!!!!

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Sometime it's done: Before the CPU date, or the disk is full, making the notebook battery limp. No problem, there are spare. But what to do with the old current donors? Simply continue to use.

A defective notebook battery can be reused. Well, maybe not in its original function but with a similar purpose. For example, as a mobile power supply for a Raspberry or as homemade Power Bank. To understand why this works, you have to again lead shortly before eyes, like a notebook battery is constructed. First, there is every battery of several round cells, usually with a voltage of 3.2, 3.6 or 3.7 or 4.2 volts. If a laptop battery is now 9.6 volts, one can assume that here three 3.2-volt cells connected in series. In order to increase the capacity and thus the endurance, several rows are often connected in parallel. So there is a 9.6-volt battery of six 800 mAh cells, ie 2 x one can start from a nominal capacity of 1,600 mAh, 3 batteries in parallel. Now loses a battery significantly to performance, ie state assets, then this often means that only makes a cell slowly limp. In other words: Large parts of the battery are therefore still usable. You just have to use them appropriately.

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1. Cut the battery pack housing

First, the battery needs to be opened. This works best along the glued seams with a cutter. But careful, otherwise there is a risk to damage the sheathing of cells.

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2. Open the battery pack housing

If you have the lid removed, the battery cells should openly visible are one.

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3. Release cells

Now you remove the lower part of the battery housing, so that only the cells and electronics remain. But beware: Danger of short circuit!

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4. separate cells from one another

Now you separate all the cells from one another, and removes the board with the electronics also.

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5. identify broken cells

With a measuring detect the weak cell

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6. Remove the solder tails

Then from the remaining intact cells remove solder tails finally, if you have not already done so.

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7. obstruct battery cells new

Now you have several options. Either you look procured via Ebay or Amazon a Powerbank-empty enclosure and equipped with the one of the cells. Or you yourself builds a new battery pack. For this one connects in the simplest case, all cells need with tape. We have here two cells so packed that each have a plus and a minus pole are together. On one side is soldered then a bridge across the two poles, for example, from a piece of paper clip or wire.

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8. Solder new port

On the other side is soldered to two cables, which converge in a connector as needed. We have chosen two pin header, because the both adequate tools for loading by means of the BEC-coupling of a Model-charger as well as for the GPIO pins of Raspberry.

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9. Battery safe load

Now the package can to the charger. We are initially reluctant to the charging current, slow charging and discharging ensures the medium term for a slight improvement in endurance. Important: The cells of the battery packs usually require a loading protecting electronics. In our case it accepts the charger. The Power Bank enclosures are already equipped accordingly.

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10. use battery pack

When charging is completed, you can use it with a Raspberry Pi to give him power,for example.

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THATS ALL, HAVE FUN AND STAY ADDICTED!!!!!!​