What's inside an iBook battery?

Discussion in 'PowerPC Macs' started by poiihy, Jun 12, 2015.

  1. poiihy macrumors 68020

    poiihy

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    Aug 22, 2014
    #1
    What kind of cells are inside an iBook battery pack? Does it have cylindrical 18650 3.6v lithium cells, or does it have flat sandwich cells?
     
  2. RedCroissant Suspended

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    Aug 13, 2011
    #2
    cylindrical as far as I can remember. An iBook battery that I had once started separating and I was tempted to get in there and start replacing stuff but decided against it.
     
  3. poiihy thread starter macrumors 68020

    poiihy

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    #3
    Really? Cool! It would be great if they were 18650. Many flashlights use 18650.
     
  4. CapnCrunch53 macrumors member

    CapnCrunch53

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    #4
    Assuming you're talking about the white iBooks, it looks like they are indeed 18650s, at least according to this video:
     
  5. poiihy thread starter macrumors 68020

    poiihy

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    #5
    OMG, that's great!! I can reuse the cells for flashlights! :D
     
  6. LightBulbFun macrumors 65816

    LightBulbFun

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    #6
    Just have to ask tho why would you? working iBook G3/G4 batteries that still hold a good charge are rather hard to find and tearing one apart just for some batteries that you can get at the store is a bit sad tbh
     
  7. poiihy thread starter macrumors 68020

    poiihy

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    #7
    Why not? I already have an iBook battery.
     
  8. happyfrappy macrumors 6502

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    Location eh?
    #8
    If the battery health of an existing battery pack is >20%, better to repack than risk it hitting critical/replacement alert or OS/power management activates the battery's safety fuse circuit as you can't reset the status once triggered/activated... seen this happen on iBook G3-G4/PowerBook G4 & Thinkpad batteries quite a bit at the 8-12% capacity point.
     
  9. skinniezinho macrumors 65816

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    Portugal
    #9
    Sorry to bump such old thread. I just bought a Powerbook G4 12 (still in the mail).
    Previous owner said it wasn't turn on for some years and at least on one of the batteries it would only run when the charger is plugged in. It doesn't worth to rebuild this battery correct?
    Anyone has the info on the 18650 cells used? Brand and mah rating?
     
  10. G4fanboy, Dec 14, 2017
    Last edited: Dec 14, 2017

    G4fanboy macrumors regular

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    #11
    Can we say all iBooks and Pismos/titanium have the 18650 cells?

    Do all ALU PowerBooks wear the 18650?
     
  11. skinniezinho macrumors 65816

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    #12
    I guess so. About alu powerbooks yes: http://www.neufeld.newton.ks.us/electronics/?p=149

    Thanks for all the links, some of them I already read. I will read the others. One brand I noticed was Sony, but some powerbook/ibook g4 with sony cells were recalled also.
     
  12. skinniezinho macrumors 65816

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    #13
    About this, found this for macbooks, the principle should be more or less the same.
    Anyone knows what is the "hardware" in the powerbook/ibook batteries?
    If anyone has a battery open and whats to share some good resolution pics of the battery circuit I would thank.

    https://forums.macrumors.com/threads/macbook-battery-rom-cycle-reset.1112363/

    https://media.blackhat.com/bh-us-11/Miller/BH_US_11_Miller_Battery_Firmware_Public_WP.pdf
     
  13. amagichnich macrumors 6502

    amagichnich

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    #14
    Question: Is it - in theory - possible to replace a nmh battery with Li-ion cells?
    For instance rebuild a PB 1400s battery with 18650s?
     
  14. Lastic macrumors 6502a

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    #15
    I have an open iBook and Powerbook battery of which I took pictures, I will post them once I'm back home
     
  15. skinniezinho macrumors 65816

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    #16
    I think it is not advisable. Google it, I think I read that chargers are different.
     
  16. Lastic macrumors 6502a

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    #17
    So once upon a time I wanted to transplant the cells of a new Newertech 12" iBook G4 battery to a dead PB G4 12" battery and took these pictures, however I never completed the project but took pictures of the assembly as a prep

    Here is the 1st part of the Powerbook G4 12" Apple battery pack disassembly

    IMG_1932.JPG IMG_1933.JPG IMG_1934.JPG IMG_1935.JPG IMG_1936.JPG IMG_1937.JPG IMG_1938.JPG IMG_1939.JPG IMG_1940.JPG IMG_1941.JPG
     
  17. Lastic macrumors 6502a

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    #18
    And the 2nd part of the Powerbook G4 12" Apple battery pack disassembly

    IMG_1942.JPG IMG_1943.JPG IMG_1944.JPG IMG_1945.JPG IMG_1946.JPG IMG_1947.JPG
    --- Post Merged, Dec 16, 2017 ---
    And last but not least a quick picture of the Newertech 12" iBook G4 battery when opened

    IMG_2289.jpg
     
  18. skinniezinho, Dec 18, 2017
    Last edited: Dec 18, 2017

    skinniezinho macrumors 65816

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    #19
    @Lastic thanks a lot for this pictures.
    The original cells are sony sf18650gr cells. Your newertech uses panasonic ncr18650.
    The video with that iBook battery rebuild is also about a newertech battery, but the cells seem LG HE218650 or maybe sanyo (both great brands).
    All this brands are ok and also used in thinkpads, but I guess panasonic and sanyo may be a little better, if anyone has more experience let us know.
    From my knowledge:
    -Sony cells in iBooks and Powerbooks were recalled
    -LG makes some good cells, but at least in my Thinkpad I've not had a great experience
     
  19. skinniezinho, Dec 28, 2017
    Last edited: Dec 28, 2017

    skinniezinho macrumors 65816

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    #20
    Since this topic has some technical details I take the opportunity to ask one more question.
    My recently bought Powerbook G4 12 1.5GHz came with 2 batteries, one "normal", about 215 cycles, lasts about 2:30 and the capacity shown in Coconut Battery is 3246mah out of 4400mah which I find "normal".
    The second battery has 206 cycles, but show a capacity of 62953mah instead of 4400mah (or similar). This one lasts the same 2:30, but in completely uncalibrated (for example it lasts the 2:30 till 90% and then shuts off).
    I presume there is on cell (or more) that have problem, but what problem? Or is something with the controller?
    In this topic it says it may be due to over voltage, but wouldn't the battery chip have some kind of security?
    This is more a matter of knowledge and maybe a way to tell if it is worth to open the battery and find the bad cell and replace it (because 206 cycles is nothing).
     
  20. AphoticD macrumors 6502a

    AphoticD

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    #21
    Sometimes even low cycle counts don’t make for a reliable battery. My TiBook has a cycle count less than 100 but shuts off around 60% (<1hr). My clamshell is at 173, but refuses to charge.

    I think if the battery has been stored for years inside the laptop without being regularly cycled then it will not be reliable. The logic board/circuit likely drains the battery to absolute zero which causes the cells irreparable damage.
     
  21. philgxxd macrumors member

    philgxxd

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    Feb 11, 2017
    Location:
    Malaga, Spain
    #22
    I have a theory that the "smart battery management chip" (I'm not even sure about the technical terms) once depleted to such a low voltage state is losing the programming because I have a battery that behaves the same after I refitted new cells into.

    I was very carefully not to leave the circuit board disconnected from a power source while I soldered new cells into but that didn't prevent the battery pack after the implantation from this behaviour.
    I guess it's due to that it once got too depleted so it already lost the programming before the rebuilt.
     

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