What are the battery cell voltage on a 28?

Discussion in 'Panasonic' started by Wyoming88!, Mar 8, 2020.

  1. Wyoming88!

    Wyoming88! Notebook Evangelist

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    i have been wanting to rebuild the battery in my 28.
    What I know is that they are 18650 regular ones.
    According to some website I could put a 2200 mah 6.6 ah cells but I don’t know the voltage of it so if any one knows that would be nice
    Bray
     
  2. kschewe

    kschewe Notebook Enthusiast

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    all 18650 are the same voltage rated 3.7v and can charge to the max of 4.2v. you would need unprotected batteries. Might be much easier just to buy a new battery unless you have a spot welder to assemble them. Can be soldered but a bit dangerous. Some new batteries once the power is disconnected from the board it will never allow to charge, new Milwaukee power tools etc. i rebuilt a few for hp laptops in the past but now most are cheap enough to buy.
     
  3. ADOR

    ADOR Evil Mad Scientist

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    Also one thing to get past before you can recell a toughbook battery is they have a chip in them that monitors battery life. If the battery reported 50% battery life in the cell. New cell's won't get over 50%. If it reports dead 0% it won't charge the new cells at all.

    Several have played with it, but I don't think anyone has had any real luck with them.
     
  4. Wyoming88!

    Wyoming88! Notebook Evangelist

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  5. kschewe

    kschewe Notebook Enthusiast

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    if those are real sony cells they would be good for battery packs for anything

    in laptop batteries most of the time only a few cells fail and many are good for other things i have like flashlights. I taken the cells from many.
    I did bypass with some luck on a hp battery. The battery board is a computer with firmware etc. Unless you were really sure what you are doing, I would not bother. I worried that it might damage the board and overcharge the cells. If they overcharge even .2 volts it could explode.
     
  6. ADOR

    ADOR Evil Mad Scientist

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    You would need some kind of reader for the chip, I don't know if the chip is even re-writable.
     
  7. kschewe

    kschewe Notebook Enthusiast

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    I have a eeprom reader. I use it to program simple chips and game cartridges but i am using code already made. i am sure its possible similar to reading and programming a bios.
    probably easier to build an external battery that has mega capacity
    or buy a new budget one for 30
     
  8. ADOR

    ADOR Evil Mad Scientist

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    I have a reader/burner as well i use for burning first gen OBD1 ECM/PCM chevy chips but i haven't pulled a battery out to see even what kind of chip is in there.
     
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