CF19 Battery Refurbishing

Discussion in 'Panasonic' started by dukeluca86, Dec 19, 2012.

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  1. dukeluca86

    dukeluca86 Notebook Consultant

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    Hello, i'm focusing on y new laptop (CF19) i ordered some spares from australia, it will take a while before arrive, so i have to do what i can with things i have here, so i opened y battery, a CF-VZSU30, it's a 6.6 Ah, and on what i discovered after the opening, it uses 6 li-ion cells of 2200mAh each, it's a series of 2 parallels of 3 cells each.

    A photo is better than 1k words
    2012-12-16 19.19.09.jpg 2012-12-16 19.19.23.jpg 2012-12-16 19.20.25.jpg 2012-12-16 19.20.57.jpg

    Now, replacing the cells is the easy part of the plan, resetting the eepro that surely will be onboard is a little less easy, the main problem is that on the chip there's some ICs i identified any of them, li-ion charg regulator, power mosfets, bidirectional switches, but there'are 2 ICs left that i can't identify, i can't find the datasheet over the net, i googled a lot but nothing...

    The "names" of these chips are 04M339 and CEG342, them both are 8 pins in TSSOP package... if you know anything about these, please let me know.
    Without a reset the battey will charge and be useful but the lifespan of the cells will be limited by the old data stored in eeprom, if you can reprogram the eeprom, you will be able to use whatever cells you want, 2000mAh, 3000mAh and so. having a 12Ah battery isn't a bad idea.
    I was wondering, is it possible that the recalibration utility can reprogram the eeprom ? Ok, i know that is possible, but it works that way ?
     
  2. Shawn

    Shawn Crackpot Search Ninja and Options Whore

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    Good luck on your quest. Many have tried and failed. This may be the Holy Grail of uber secret Panasonic information.

    I think they are part #forgetaboutit and made from un obtanium:D
     
  3. ADOR

    ADOR Evil Mad Scientist

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    I have played with it myself with a CF-28 battery. I could never get a signal from the chip to show up on my EPROM reader. So I have moved that project to the back of the line.
     
  4. Shawn

    Shawn Crackpot Search Ninja and Options Whore

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    I know next to nothing about eeproms, but what if someone would disassemble a new battery and download the "image" of those eeproms?
    Couldn't you then just flash the chips in the re celled batteries? Like I said, I am clueless on this.
    I will bet a dozen donuts that those are Panasonic made chips. I would look in Panasonic catalogs.
    CEG342 sure looks like a Panasonic number to me.
     
  5. Tinderbox (UK)

    Tinderbox (UK) BAKED BEAN KING

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  6. ADOR

    ADOR Evil Mad Scientist

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    In programming the chips you are just making a switch of 0 and 1. The early chips were easy to reset. They had a glass window on the top and could be reset with an ultraviolet light through that window.
     
  7. dukeluca86

    dukeluca86 Notebook Consultant

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    Yes of course but i have not to reset ALL data on the eeprom, otherwise it will be irremediably unreadable, but i have to restore the original condition of the battery, like new, i think that is not too difficult to read the data they are only two wire, ClockBus, DataBus and Ground, so you now what's ground, you only need to "sniff" data on the two lines with the help of a computer and then interpreting the data flow, to know which protocol is it using, lots of them uses SmBus... But not all of them...
     
  8. ADOR

    ADOR Evil Mad Scientist

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    I really don't have that much experience with it. I got a older reader that plugs into a desktop port and was working with leads. I may of not had a good connection. I got some advice from a older electrician on the rig that use to mess with the older ones.
     
  9. dukeluca86

    dukeluca86 Notebook Consultant

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    I found a program in demo version, it's named smart battery workshop, it allow you to read a battery EEPROM, but only on battery thet uses SMBus system, it require a very simple adapter to connect on a LPT port, and only 3 wire, i will put it together when i have some spare time, probably after Christmas.
     
  10. dukeluca86

    dukeluca86 Notebook Consultant

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    OK, i'm not able to refurbish this cf19 battery, i token one from china, but... I dismantled the li-ion cells in the battery, and found that these cells are enormously superior to all other cells sold apart, thay are panasonic cells, and their specs guarantee strong current both in charge and discharge, making them capable of feeding big current loads, i used one of this cells in my cree flashlight, 3W about 320 lumen, it make a huge difference, with the original superfire cells rated 4200mAh the torch draw 700mA, while it draws 1Ah with the pana cells that are rated 2200mAh, it's in the led specs and make a lot of light, i can say 150%, and the cell last longer than the superfire that it's obviously overrated.
     
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