Connect with us

Opened laptop battery to replace lithium ion cells (Lenovo X61tablet PC) -- Where do I get replaceme

Discussion in 'Electronic Repair' started by JoeSchmoe, Sep 17, 2010.

Scroll to continue with content
  1. JoeSchmoe

    JoeSchmoe Guest

    Have you ever opened up your laptop battery to replace the lithium ion
    cells inside (if so, I could use the help as I'm stuck).

    Here are the pictures of the operation on a Lenovo X61 tablet PC 8-cell
    4500 amp-hour battery kidney-transplant operation.

    The outside of the IBM Lenovo X61 tablet PC battery pack has the part
    - FRU 42T4507
    - ASM 42T5209

    And the batteries themselves, seem to have numbers on them of:
    - cylinders BCM 3A6 72653
    - rectangles C 3 171353

    Any idea where to obtain these lithium ion replacement batteries?
  2. JoeSchmoe

    JoeSchmoe Guest

    Here is a pictorial tutorial, of sorts, for the first half of the Lenovo
    X61 tablet PC laptop battery replacement.
    0. Short:
    1. Direct:
    (the closing slash is required!)
    2. Player:

    That tutorial has 18 pictures showing all the steps in breaking open the
    dead Lenovo laptop battery pack seamlessly and easily.

    The problem now is finding the batteries from the numbers on the
    batteries and soldering them back in w/o destroying them.

    Any advice/help if you've done this before, is much appreciated!
  3. I fix about everything I can but not laptop batteries. Those have an
    internal circuit that keep the batteries from over charging and
    everything matches up with the computer BIOS to charge and extend
    battery life. What I do is search the web and buy a replacement battery
    with a decent warranty. I doubt you can even buy the new cells for what
    the entire new battery costs.
    Worst case of do it yourself repair would be a fire some day when
    it's charging or being used.
    Here's one on e-bay for 42 bucks says it has a 3 year warranty and the
    dude is a power seller with a decent track record. Free shipping

    and a laptop fire,
  4. Joe Schmoe

    Joe Schmoe Guest

    Once I find the cells, I'll definitely get the ones with soldered tabs as
    I'm OK (but just OK) with soldering.

    I found this web site "How to rebuild a Li-Ion battery pack", implemented
    for Fujitsu - Siemens Lifebook S- Series FPCBP25 battery pack at

    They found Panasonic lithium-ion replacement cells at
  5. Joe Schmoe

    Joe Schmoe Guest

    The question of why is a good one ... the answer is it's sheer cost! :)

    The factory new battery is on the web for about $150.
    I'm worried about the knockoffs which cost around $50 to $75.

    BTW, I found some more references of successful rebuild DIYs which I'm
    going through now as my biggest problem at the moment is finding the
    replacement cells (later it will be fitting it all back together).

    - HOW-TO: Rebuild your laptop battery by Engadget

    - Rebuilding a Laptop Battery Oct 05, 2008 by Phil Hughes

    - Refilling laptop batteries! February 17th, 2007 in Projects, Technology

    - Can laptop batteries be repaired? by Isidor Buchmann Cadex Electronics,
    December 2001

    - DIY Laptop Battery Rebuild: by Kevin O'Brien, on
  6. Thanks for those references!

  7. Brian Gaff

    Brian Gaff Guest

    I thought batteries used in these packs had to be matched to avoid problems
    with reverse charging etc that might cause them to explode.

  8. Joe Schmoe

    Joe Schmoe Guest

    Hi Isaac,

    Welding the tabs without destroying the battery the biggest gotcha so
    this home made battery tab spot welder DIY idea is great!

    The Poor Man's Battery Tab Welder

    Build your own CD battery tab welder for $100

    DIY Capacitive Discharge Spot Welder, AKA Battery pack maker

    How to hack a dead laptop battery
  9. Joe Schmoe

    Joe Schmoe Guest

    Hi Brian,

    What do you mean by "matched"?

    Note: All the existing electronic circuitry for the Lenovo x61 tablet
    laptop lithium Ion battery is intact.

    The only thing we're changing out is old cells for new cells.

    What do you mean by "matching"?
  10. ng_reader

    ng_reader Guest

    I give up, what or where is "Mobile Track Power"
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day