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Replacement for old cells in a laptop battery

  • Dudez Monday, December 12, 2011 10:35 PM Reply
    I want to use these to replace the 6 cells in a dell laptop, would it work?
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  • matrix-neo Moderator Monday, December 12, 2011 10:39 PM Reply
    yes, a lot of laptop battery packs use 18650 cells like this, if the pack has a battery protection pcb(and not just a thermistor) you would need the unprotected 18650 cells
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  • Dudez Monday, December 12, 2011 11:10 PM Reply
    Any idea where I can find that info? like type of battery and if my laptop has that protection pcb?
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  • desolder Top 10 Forum Poster Tuesday, December 13, 2011 1:57 PM Reply
    And even if you ARE experienced with working on raw cells, the cost of aftermarket laptop batteries are SO CHEAP compared to the cost of the raw cells that it simply isn't worth the hassle of rebuilding it yourself. Take a look at some of DX's laptop batteries. A typical 6 cell 11.1V ~4400mAh battery sells for around $32. This includes the cells, casing, all of the internal electronics, and of course it's already assembled and ready to go. Compare it to buying 6 of these cells for $19.80. Then you need to crack open your old battery, rip out the old cells carefully, and solder/spot weld the new cells in. If you don't do it correctly, you could destroy the cells and even your laptop. Is the time and hassle (and possible danger) worth saving a measly $12?

    But if you insist...

    You need to get FLAT-TOP UNPROTECTED cells. This cell has a "button-top", so it will be slightly longer and may not fit inside the original casing. If you are a beginner with soldering, then I strongly recommend you get cells WITH TABS, such as sku.91269, and solder to the tabs, not the cell itself. Cells are very sensitive to heat, and sloppy soldering will easily damage it.

    You don't need to purchase a separate protection circuit because nearly all laptop batteries have a multi-cell protection circuit inside them. You just reuse the existing one and you'll be fine.
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  • CosmoVitelli Wednesday, December 14, 2011 3:36 PM Reply
    I think desolder is right, anyhow, here are some examples of how it is done:

    http://www.electronics-lab.com/articles/Li_Ion_reconstruct/index.html

    http://www.summet.com/blog/2007/02/17/laptop-battery-refill/

    http://www.notebookreview.com/default.asp?newsID=4224

    I only would want to do that work if
    - a replacement battery is no longer available or
    - is very very expensive and
    - I have a bit of experience with soldering (I have, b/c I made battery packs for my R/C planes myself)

    otherwise I would just buy a new battery.

    Regards, Cosmo
    DX - always good for a surprise. ;-)
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