LiPo Batteries Hacking and refurbishing

TOP meneame.net

One of the difficult parts when prototyping is to find reliable power sources. Today is still hard to find the battery size we want to use because country exporting frontiers stops these chemical packages. Here I’ll show how to refurbish dead batteries by combining cells and protection circuits to preserve battery life.

An (almost) dead Apple MacBook Pro (17″) battery fell in my hands so I decided to tear it down to see if there was something profitable. Inside I found that the battery pack was composed with 6 individual cells, paired in 3 groups.

Apple Mac Book Pro 17" Battery Disassembly

Apple Mac Book Pro 17" Battery Disassembly

Seems that the third group had a small voltage difference between cells so they began discharge between them. This leaded both cells to die, condemning the entire battery pack.

Here can be seen the individual cells:

Batteries separated from the main board.

Batteries separated from the main board.

As can be seen the cells doesn’t have individual protection circuits witch are important to avoid discharge below 2.7v to preserve battery life.

I also came across with a small photo-frame that I bough just for hacking fun as is really a bad piece with almost no memory, no SD card expansion, 128×128 display and bad electronics. It cost me 1.99€ and the battery was drain dead from the first moment I opened the package.

Small and dead LiPo battery with the protection circuit.

Small and dead LiPo battery with the protection circuit.

It was inflated and reading 0.26v. Obviously battery couldn’t be rescued, but I salvaged the power cutting circuit. Here is the reverse side of the protection circuit board. Notice the polarity when soldering the LiPo cell and wires:

LiPo Battery protection circuit downside.

LiPo Battery protection circuit downside.

Once I soldered the protection circuit board to the Apple battery cell I ran some charging and discharging tests to ensure the assembly works fine and that power is cut at 2.7v:

Working Refurbished Battery

Working Refurbished Battery

<< Volver

57 comments to “LiPo Batteries Hacking and refurbishing”

  1. Comment by Salvaging Lithium cells and circuits - RaspberryPiBoards:

    [...] let them get below a certain voltage threshold during discharge. We enjoyed reading about [Carlos'] Lithium cell salvage efforts as it discusses these [...]

  2. Comment by Salvaging Lithium cells and circuits | Blog of MPRosa:

    [...] let them get below a certain voltage threshold during discharge. We enjoyed reading about [Carlos'] Lithium cell salvage efforts as it discusses these [...]

  3. Comment by Rob:

    Since all cells in the MacBook’s battery all seem to be from the same production batch there is of course the risk that the other cells will fail in the (near) future.
    Using the salvages cells for a less current hungry application will stretch their life and is a good way of using them.

    As you noticed, the 6 cell pack consists of 3 sets of 2 cells placed in parallel and that may well be the reason why one of those sets failed: a slight difference between the two parallel cells in parallel will result in a current flowing between them, damaging both cells.

    It looks like you also split the parallel sets – a good thing to do, this will extend battery life.

    Please note that the 2.7V is a bit low for a LiIon cell. Most protection units I have cut off at 2.8V but it is even better to stop using the batteries before this point.
    Apart from preventing deep discharge, these little protection circuits will sometimes also prevent batteries from being overcharged and from over-current.
    Some electronics shops sell these things – just in case you need an extra one.

  4. Zen Comment by KaR]V[aN:

    Thank you Rob!

  5. Comment by djdava:

    Muy bien Karman! otro post publicado en hackaday y muy interesante. Enhorabuena! A ver cuando volvemos a quedar!

  6. Comment by Salvaging Lithium cells and circuits | Make, Electronics projects, electronic Circuits, DIY projects, Microcontroller Projects - makeelectronic.com:

    [...] let them get below a certain voltage threshold during discharge. We enjoyed reading about [Carlos'] Lithium cell salvage efforts as it discusses these [...]

  7. Comment by SeRKeRoS:

    ¡Hola Carlos! He llegado a este artículo a través de Hackaday. Me ha gustado, y todo el blog en general, felicidades. Yo hace un tiempo también abrí una bateria LiPo:
    http://serkeros.wordpress.com/2012/07/18/la-lipo/
    Está en catalán, supongo que lo entenderás, y si no, Google translate.
    Un saludo de un colega al que también le gusta trastear y abrir cacharros.

  8. Comment by Salvaging Lithium cells and circuits:

    [...] let them get below a certain voltage threshold during discharge. We enjoyed reading about [Carlos'] Lithium cell salvage efforts as it discusses these [...]

  9. Comment by caveman music festival weston colorado:

    caveman music festival weston colorado…

    Find here the best new americana music festival colorado currently now in stock and at the best price you can get now!…

  10. Comment by promotional products:

    promotional products…

    Find the best safety kits that’s now available in addition at reasonable prices now only!…

  11. Comment by mobile auto detailing charlotte nc:

    mobile auto detailing charlotte nc…

    Profit from amazing charlotte auto detailing currently taking on new clients in addition reasonably priced now!…

  12. Comment by americana music festival colorado 2022:

    americana music festival colorado 2022…

    Find here the top option for americana music festival colorado that are available and on sale you can get now!…

  13. Comment by customized water bottles:

    customized water bottles…

    Get the the top corporate gifts that is now available and with reasonably pricing now only!…

  14. Comment by have a peek at these guys:

    have a peek at these guys…

    Procure the best online mailing service immediately on a best offer and gets your money flowing immediately!…

  15. Comment by b&b insurance:

    b&b insurance…

    Procure top quality bed and breakfast insurance immediately on a best offer and gets your money flowing immediately!…

  16. Comment by wholesale promotional products:

    wholesale promotional products…

    Get the best promotional items currently now available in addition on sale now only!…

  17. Comment by navigate here:

    navigate here…

    Start the year the right way with What hats are best for an african safari? that’s providing a fantastic ROI to get started today!…

  18. Comment by colorado live music festival:

    colorado live music festival…

    Get the greatest available caveman live music festival now available in addition currently on sale you can get now!…

  19. Comment by diabetes ketoacidosis treatment:

    diabetes ketoacidosis treatment…

    Hire a top diabetes remision currently now available and with reasonably pricing now only!…

  20. Comment by rhinoceros hunting namibia:

    rhinoceros hunting namibia…

    Get the new year started right with what does an african hunting safari cost? that is providing a fantastic ROI to get started today!…

  21. Comment by see it here:

    see it here…

    Procure the best bed and breakfast insurance policy immediately on a best offer and gets your money flowing immediately!…

  22. Comment by click here now:

    click here now…

    Find the best available americana music festival colorado that’s in stock and currently on sale you can get now!…

  23. Comment by badge reels:

    badge reels…

    Hire the the top custom lanyards that’s now available and at good rates now only!…

  24. Comment by mobile car detailer:

    mobile car detailer…

    Buy a plan for expert charlotte car detailing currently taking on new clients and on sale now!…

  25. Comment by colorado live music festival:

    colorado live music festival…

    See the best available jazz music festival that are now in stock in addition at the best price you can get now!…

  26. Comment by reusable face masks:

    reusable face masks…

    Get the the top promo items that’s now available and with reasonably pricing now only!…

  27. Comment by bed & breakfast insurance:

    bed & breakfast insurance…

    Locate top quality hotel insurance requirements now on a best offer and creates efficiency for you immediately!…

  28. Comment by bed & breakfast insurance:

    bed & breakfast insurance…

    Locate top quality venue insurance today on a best offer and gets your business ROI immediately!…

  29. Comment by wing shooting in namibia:

    wing shooting in namibia…

    Get going right now with with namibia hunting safari that is ROI producing to get started right now!…

  30. Comment by promo items:

    promo items…

    Find the the top personalised engraved pens currently now available and at reasonable prices now only!…

  31. Comment by see it here:

    see it here…

    Procure the best printing and mail services now on a best offer and gets your money flowing immediately!…

  32. Comment by branded face masks:

    branded face masks…

    Find the the top metal water bottles that is now available in addition at good rates now only!…

  33. Comment by printed water bottles:

    printed water bottles…

    Find the the top imprinted promotional gifts currently now available in addition with reasonably pricing now only!…

  34. Comment by jazz music festival:

    jazz music festival…

    Get the best available weston colorado music festival now available in addition currently on sale you can get now!…

  35. Comment by diabetes neuropathy treatment:

    diabetes neuropathy treatment…

    Get the best ortho knee that is now available and at good rates now only!…

  36. Comment by hospitality insurance companies:

    hospitality insurance companies…

    Get going with highly amazing hotel insurance policy today on a best offer and creates efficiency for you immediately!…

  37. Comment by a fantastic read:

    a fantastic read…

    Get the best available colorado music festivals currently now in stock in addition at great prices you can get now!…

  38. Comment by car detailing charlotte:

    car detailing charlotte…

    Profit from expert mobile auto detailing charlotte nc currently taking on new clients in addition on sale now!…

  39. Comment by colorado music festival 2022:

    colorado music festival 2022…

    Get the greatest new music festival colorado now available and at great prices you can get now!…

  40. Comment by visit website here:

    visit website here…

    Get the the top business gifts that is now available in addition at reasonable prices now only!…

  41. Comment by check over here:

    check over here…

    Get going right now with with What are the accomodations like for an african safari? that’s ROI producing to get started now!…

  42. Comment by imprinted promotional gifts:

    imprinted promotional gifts…

    Hire a top branded face masks currently now available in addition at good rates now only!…

  43. Comment by custom printed face masks:

    custom printed face masks…

    Find the the top metal water bottles that’s now available in addition at good rates now only!…

  44. Comment by hotel liability insurance:

    hotel liability insurance…

    Procure the best hotel insurance policy now on a best offer and gets your money flowing immediately!…

  45. Comment by print to mail service:

    print to mail service…

    Get going with the best bill mail service now on a best offer and gets your business ROI immediately!…

  46. Comment by customized water bottles:

    customized water bottles…

    Hire the the top personalised engraved pens currently now available and with reasonably pricing now only!…

  47. Comment by wing shooting in namibia:

    wing shooting in namibia…

    Start the year the right way with big game hunting rifles for africa that is providing a fantastic ROI to get started right now!…

  48. Comment by diabetes cure:

    diabetes cure…

    Find the best diabetes neuropathy treatment currently now available and at reasonable prices now only!…

  49. Comment by hotel insurance coverage:

    hotel insurance coverage…

    Procure top quality motel insurance brokers today on a best offer and gets your business ROI immediately!…

  50. Comment by mobile detailing charlotte nc:

    mobile detailing charlotte nc…

    Profit from professional mobile car detailing charlotte nc currently taking on new clients in addition reasonably priced now!…

  51. Comment by branded products:

    branded products…

    Hire the the top imprinted promotional gifts that is now available and at reasonable prices now only!…

  52. Comment by my company:

    my company…

    Locate top quality motel insurance brokers immediately on a best offer and creates efficiency for you immediately!…

  53. Comment by personalised engraved pens:

    personalised engraved pens…

    Find a top corporate gifts that is now available in addition at good rates now only!…

  54. Comment by first aid kits:

    first aid kits…

    Hire the the top promotional products currently now available in addition at reasonable prices now only!…

  55. Comment by statement printing and mailing services:

    statement printing and mailing services…

    Procure highly amazing print invoice online today on a best offer and creates efficiency for you immediately!…

  56. Comment by personalised engraved pens:

    personalised engraved pens…

    Get a top branded products that’s now available in addition on sale now only!…

  57. Comment by What hats are best for an african safari?:

    What hats are best for an african safari?…

    Start the year the right way with big game hunting rifles for africa that’s providing a fantastic ROI to get started today!…

Comentalo

*
Contador