HOW TO REPAIR LAPTOP BATTERY ?

381,192

543

142

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!!!!

Full Spectrum Laser Contest 2016

Participated in the
Full Spectrum Laser Contest 2016

Be the First to Share

    Recommendations

    • 3D Printed Student Design Challenge

      3D Printed Student Design Challenge
    • Made with Math Contest

      Made with Math Contest
    • Laser Challenge

      Laser Challenge

    142 Comments

    0
    UncleEd
    UncleEd

    5 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 5 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 5 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
    AlanJacob688
    AlanJacob688

    Reply 8 months ago

    This is a really helpful comment for everyone those looking to make this instructable.

    0
    Soumya 12
    Soumya 12

    Reply 1 year ago

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

    0
    HOBBY TO MAKE
    HOBBY TO MAKE

    Reply 5 years ago

    Thanks for the detailed commect..!!!

    0
    MarkP176
    MarkP176

    Reply 5 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 3 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...

    0
    UncleEd
    UncleEd

    Reply 5 years ago

    We agree 100% about the economics. The purpose of my message was to try to keep the lithium cells out of the trash. Depending on the source you read, they may be a hazardous material.

    One thing that may be relevant is where you live. There are differences from country to county in laws about protecting the environment, resources for recycling things that we Americans can recycle, and the cost of some of these things that are cheap and easy to find where we are.

    0
    thalian
    thalian

    Reply 5 years ago

    I was going to add the same thought!

    0
    HOBBY TO MAKE
    HOBBY TO MAKE

    Reply 5 years ago

    You have to carefully open the battery box
    You may get the circuit damage .
    Sometimes the cells are all good but the circuit is dead.
    Just through below 500 mah capacity cell.

    0
    namtran1976
    namtran1976

    8 months ago

    Dear buddies,
    I personally think the replacement of old cells by new ones following this instruction will not work in most cases. This guidance may be suitable for the very old laptop models only. From my understanding, the laptop bettery circuit contains an EPROM chip and this chip has several functions for the battery, of which counting the number of charging and discharging is one amongst other functions. When the battery is almost die, the EPROM also records the status of the cells (i.e. nearly die), and if the replacement of the old cells by the new ones without the re-flashing of the EPROM, the replacement should make no sense at all. Re-flshing of the EPROM in the battery circut is done by a speacial device with a specific software so that the EPROM recognizes the new cells as brand new and counts the charging & discharging as zero or something like that.

    Best,
    Greetings from Vietnam

    0
    AlanJacob688
    AlanJacob688

    Reply 8 months ago

    Thanks for the comment

    0
    zargham mughal
    zargham mughal

    Question 11 months ago

    I replaced the battries and ive checked the voltage the all give above 3 volts but still when i plug it in the laptop laptop detects the battery but neither does it charge the battery nor it takes the power from the battery kindly help me

    0
    payarapakistan143
    payarapakistan143

    Question 11 months ago on Step 8

    I have done all steps of laptop repairing process, but it still showing that bettry is not charging...

    0
    oldsnakes
    oldsnakes

    11 months ago

    The notebook battery pack has a microcontroller in it to manage the charging and discharging. It is not only controls the power flow from charger and to the computer, but also safe guards the process to avoid overcharge/over-drain and overheat the pack. The pack is talking to a embedded controller in notebook through SMBus to manage the power flow.

    There are two different approach the manufacture take for protections:
    1) When a fault condition happened, cutoff current flow until the condition is removed.
    2) When a fault condition happened, cutoff current flow, register the fault and disable the battery until the battery pack is reset.

    One of the fault is: If the battery cell(s) voltage is dropped under a preset level, lock up the battery circuit to prevent them being charge and discharge. This fits exactly the condition as when you remove the old battery cells to replace with new cell(s). That is why the pack failed after replacing cells. When this happen, the type 1) battery may allow a very low rate to charge the pack for determining if it is a "short" condition at battery or just a over-drain. If it is not a short, the pack will recover after "hours" of low current charge and bring the battery pack back to alive again. However, the type 2) will mark a bit in the microcontroller EEPROM memory and lock it up to prevent being charged or discharged so it won't cause further damage. The pack became "dead".

    In case of the over-voltage condition on cell(s), the pack may has a fuse as the "secondary protection". The fuse is blow not by the "over-current" rather break by intentionally heating the fuse to make it "burn". (this type of fuse has three terminals and a "heater" resistor in it) If this fuse is blow, the pack is bricked. The over-voltage may happen if you charging the cells without monitoring voltage on each cell-sets carefully. (Or, think higher voltage will charge faster). This fuse normally is located between MOSFET and highest cell terminal, or MOSFET and the positive pack terminal.

    The re-celled pack also may need to have a jump start. This is for restart the microcontroller after lost power by removing cells. The jump start is done by apply a voltage at pack positive terminal. You may seen this method on some blog or YouTube clip by shorting from battery positive to pack positive terminal.

    Most of the battery packs do have a usage counter to track the charge/discharge cycles. It is recorded in the EEPROM memory as well. And, some of them also use it to reduce capacity or lockout pack after certain count. Replacing the battery cells does not reset the counter normally. A special software and/or a fixture will require to do so. The SMBus at battery pack interface can be used to unlock the battery pack. However, most of time you would need a adaptor to do so. And it likely is password protected which be difficult to break-in. So, after re-pack, it may still at the same condition as before.

    Therefore, doing this hack may kill the remaining life of your low flow battery pack. It is also dangerous trying to maintain the power on the pack while replacing the cells for bypassing these issues. (Especially when soldering is required). A short can cause fire or damage the PCB in the pack. All these protection measures have their purpose.

    Play safe!

    0
    abdulmajeed hamza
    abdulmajeed hamza

    Question 1 year ago on Step 4

    I check all battery are good and still not charging what im going to do.
    Can i change the battery circuit. Help me please

    0
    Ptplopes
    Ptplopes

    Question 1 year ago

    Hi !
    I have just changed the 3 x18650 batteries of the BTY-S11 pack, from my LG netbook.
    I used an external source to charge the batteries prior to install them.
    I mounted the pack but no voltage at the connector. I have the negative at pin 9 but no positive at pin 1!
    Need some help to have it fixed.

    Regards,
    Paulo de Tarso

    0
    ozkansezer
    ozkansezer

    Question 1 year ago on Step 9

    i have asus asuspro pu551ld model laptop and the battery is 14.v 4 cell. i replaced the old ones ( LGABB41865) with SONY VTC6 18650 3.7V 3000mAh ones. but no charge and no percentage of battery (0%). Labtop is not switch on with battery and charge. what can else to do? is anybody know pinout of the battery connector?

    p.s (cell has 3.7V each one and total 14.8 V)

    battery_old.jpgbattery_new.jpg
    0
    praveenk314
    praveenk314

    1 year ago on Step 8

    Hi I have replaced my hp laptop battery cell (lgabc41865) with samsung icr18650 cell. I connected new 18650 and placed all the connection as per the old connection,used jumper connection to avoid shorting.
    My laptop doesn't power on by battery still and its not charging.what am I missing.
    How does grounding connection has to be does it have to grounded to the insulated battery body like the manufacturer it was.
    Why is my laptop not powering on with battery mode.
    Help is appreciated