HOW TO REPAIR LAPTOP BATTERY ?

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Introduction: HOW TO REPAIR LAPTOP BATTERY ?

HELLO MY FELLOW !

I AM WAQAR

here, i will show you how to repair your laptop battery for very cheap at home.

+WHY ?

The laptop batteries consists of lithium cell which are called 18650 cells

they are not eternal

they have life period of about 2 years

+WHEN TO REPAIR ?

when you see your laptop is charged fully but does not last even half an hour or less.

which means the cells inside the battery are dead.

Step 1: REQUIREMENTS

-1 old dead laptop battery from laptop repair shop

-1 your laptop battery (which you want to repair)

some wire & tools like wire cutter etc...

and also some electric tape

Step 2: OPEN THE OLD DEAD BATTERY

Use some tools to open the laptop battery without damaging the battery box

because the box will be used later.

Step 3: GET THE 6 CELLS OUT FROM OLD DEAD BATTERY

Take out the 6 cells which are in 2-2 parallel connection.

(don't break the parallel connection but cut the series connection)

Step 4: TAKE OUT YOUR MULTIMETER & CHECK THE VOLTAGE

THIS step is very important !

generally 3.6 or above volt batteries are good below this voltage are the bad ones

voltage test is just temporary solution for the capacity check of 18650 cells

i recommend to use imax b6 charger for capacity test.

JUST GET 6 GOOD (18650) LITHIUM CELLS OR BUY THEM FROM AMAZON OR EBAY

Step 5: NOW CONNECT CELLS IN SERIES CONNECTION

BY using some wire connect all cell in series connection

just check the overall voltage of battery pack

it should be around 12 volts .

Step 6: NOW OPEN YOUR ORIGINAL LAPTOP BATTERY

JUST open your original laptop battery and throw the cells because they are all useless & keep the circuit

(if you want to keep then check the capacity if some of them are good then keep them for future projects)

IMPORTANT:

don't damage the circuit or battery box while opening the battery .

Step 7: CONNECT THE CIRCUIT TO THE BATTERY PACK

NOW by using some wires connect the battery pack to the circuit

IMPORTANT:

you will see 4 wires coming out from the circuit in which the longest is negative.

the battery pack will also have 4 wires 1 is negative and 3 are positive (one to the end and two between the battery pack)

Step 8: CHECK BEFORE PACKING BATTERY

connect the battery circuit to the laptop

and press power button to see it's working or not

IMPORTANT:

if nothing happens after pressing power button

don't panic connect the charger to the laptop for 5 minutes then remove the charger.

(if again not working just contact me with your problem)

Step 9: SUCCESS! JUST PUT BATTERY AND CIRCUIT INSIDE THE BATTERY BOX

the final step to put battery pack and circuit in the battery box.

do it gently .

use some super glue or tape to fix the joint of battery box.

!!!!WE ARE DONE!!!!

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    133 Discussions

    0
    vivekomal
    vivekomal

    Question 2 months ago on Step 4

    My batteries show 3.7 volts and above , and the laptop is also switching on with battery but as i connect charger it doesn't charge neither gives charging indication. I am not understanding what to do.

    I used a app to check battery health it shows 4% and current capacity has decreased to half. I want your suggestion will changing cells with new cells solve my problem.

    Please replay ASAP it really very necesary

    Thanks in advance

    0
    razeeshtandeli
    razeeshtandeli

    Answer 2 days ago

    Check laptop output voltage

    0
    gargshubham75
    gargshubham75

    9 days ago on Step 9

    My battery shows permanent failure after replacing the cella

    0
    moise_gabi
    moise_gabi

    Question 6 weeks ago on Step 8

    Hi, I've done everything you said but my laptop still doesn't charge. I've even updated the driver and nothing. Could be a problem with the circuit?

    DSC_0315.JPG
    2
    pankaj suthar
    pankaj suthar

    Question 4 months ago on Step 9

    It has been 10 year to my laptop. My laptop battery was not working so i replaced all cell of the battery but still when i disconnect the charger from laptop power it instantly switch off then i charged manually but still problem is coming so i need tips for repairing the battery circuit

    IMG_20200622_190653.jpg
    0
    Gerhardv
    Gerhardv

    Answer 2 months ago

    If you disconnected all the batteries from the battery board a special fuse would have been broken. Im not sure if the old batteries worked with the fuse but most of the new batteries do

    0
    GeraldD1
    GeraldD1

    Answer 3 months ago

    Well the BMS circuit have a counter for charges and discharges, probably is the problem.
    The BMS circuit for one cell is more simple and I am try to obtain the electronic schematic but depend the model of board

    0
    lovelydev1991
    lovelydev1991

    Question 3 months ago on Introduction

    Hi i have HP laptop and its battery (lgabc21865) (But the battery is not working.) I need to know that, What kind of battery i can replace for that battery? i am not able to find the same value Battery in my Country (In India) Due to Corona Virus Lock down. So Can i use this 3 cells without adding one more cell for my laptop? Advance Thanks! :)

    WhatsApp Image 2020-07-15 at 4.58.11 PM.jpegWhatsApp Image 2020-07-15 at 4.58.10 PM.jpeg
    0
    Gerhardv
    Gerhardv

    Answer 2 months ago

    Hi lovelydev1991,
    When changing your laptop batterypack's batteries never disconnect the power from them. They have a special type of fuse, when power removes the fuse gets blown and the battery is bricked.. if you want to change the batteries you would have to have constant power on the terminals that go to the battery board. I just bought new 18650 batteries for my laptop so I will probably make a tutorial on how to do it without bricking the battery.

    0
    kritarth_dhanraj
    kritarth_dhanraj

    Answer 2 months ago

    Bhai, dont waste your time as u might not be aware of the BMS. This lead to brick your battery circuit if you try to change your battery. Your laptop will turn on only when you keep connected the charger and if you remove it then it will turn off after changing the battery. And you cannot use the laptop with 3 cells as if you see the circuit it take 4 different voltages. 1st from only one cells, 2nd from the series combination of 2 cells, 3rd from the series combination of 3 cells and at last all 4 cells. And bhai maine mangwaya tha cell amazon pe mil raha hai. Search for 3.7 volt battery. Mil jayega.

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    1
    VVIJAY772
    VVIJAY772

    8 months ago

    Hahahahahaha All laptop battery's digitally connected with charger chip in SM bus DATA bus.if u change only cell it will not work.for easy fix you need to buy new battery back.bcoz they digitally monitor charging & discharging time & battery status.

    0
    GeraldD1
    GeraldD1

    Reply 3 months ago

    I know it is a bit more complicated but changing the memory of the BMS board is an option.
    Although the issue of cost and time makes it very impractical

    0
    Whistleup
    Whistleup

    Reply 5 months ago

    Now i understand all this, cuz i've tried this method twice and i just ended up damaging my batteries, i had to go buy new ones

    0
    UncleEd
    UncleEd

    4 years ago

    >>JUST open your original laptop battery and throw the cells

    >>because they are all useless & keep the circuit

    If these are lithium cells, DO NOT throw them away. They can be recycled and shouldn't be put into the trash.

    0
    HOBBY TO MAKE
    HOBBY TO MAKE

    Reply 4 years ago

    Some time a l.t battery is dead
    Becoz,, of circuit is dead not the batteries.

    But sometimes few cells are dead in a battery

    I have opened many l.t batteries
    My experience was 60:40 where 60 is good 40 is below 1000 mah (can be used for other projects)

    0
    ugur23
    ugur23

    Reply 4 years ago

    Circuits never die. It locks itself and sets itself "Permanent Failure" flag then blows the fuse when it dedected some issues,like when 1 cell died in battery. one died cell will make battery extremely unbalanced , it will heat pretty much then battery will lock itself

    Same thing can happen when battery is over discharged. Or when you overload the battery. It will blow fuse , then battery will enter pf mode.

    And last warnings ; the battery can die even when upgrading firmware of battery (especially lenovo / IBM batteries with custom firmware ).

    If you have a Lenovo/IBM battery. Dont try this. It will OK to disconnect cells . but when you reconnect new cells , it will enter pf mode and blow the fuse when you triggered a power reset of circuit / smb controller.

    And when you trying to recell a battery , first disconnect GND at end of the cells , when you builded all cells , connect GND last. Because removing gnd will immediately power down battery controller. If you disconnect cells randomly , battery will dedect imbalanced cells and it will enter the permanent failure mode.(And if you have a battery with a external eeprom (like bq2040/2060) backup eeprom first in case battery gets locked , just rewrite backup to battery then powercycle the circuit)

    Sorry for long post and bad english. These are all my information about SBS 1.0 and 1.1 compatible batteries.

    0
    Soumya 12
    Soumya 12

    Reply 3 months ago

    Help me please I am working with lenovo (ibm) laptop battery bms.

    0
    HOBBY TO MAKE
    HOBBY TO MAKE

    Reply 4 years ago

    Thanks for the detailed commect..!!!

    0
    MarkP176
    MarkP176

    Reply 4 years ago

    Yeah, but at the price of buying a new set of six 18650s I may as well just get a full replacement battery from a discount supplier... Hardly any difference.

    0
    XulescuN
    XulescuN

    Reply 2 years ago

    You can buy a good quality 6 pack under 10 bucks (I am from Europe and I have buy them at 1.2eur/pcs). Let me doubt you will find a replacement for this amount...