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

Picture of 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

Picture of 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

Picture of 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

Picture of 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

Picture of 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

Picture of 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

Picture of 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

Picture of 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

Picture of 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!!!!

Comments

HOBBY TO MAKE (author)2017-01-09

And one more thing if your battery's circuit is dead then you have find the correct circuit replacement...
Unless the connection may not work..

backlash07 (author)HOBBY TO MAKE2017-01-10

there is no battery plastic cover it is open type sytem. there are many model of 18650 cell like 18650 700mah/2200mah/2600mah which one will suitable

HOBBY TO MAKE (author)backlash072017-01-11

2200 mAh are commonly used...
But if you have 2600mah then use it..
Don't use 700 mAh....

backlash07 (author)HOBBY TO MAKE2017-01-12

thnks bro but i doubt if i use wrong mah then battery will explode during heavy usage ??

almir (author)backlash072017-09-17

no it will not explode because bms measures voltage of each cell and does not allow voltage to be higher ,

HOBBY TO MAKE (author)backlash072017-01-12

No it won't
If your circuit it OK...
That is why there are temperature sensors.

. for safety...

backlash07 (author)HOBBY TO MAKE2017-02-03

hey bro i have repair my laptop battery by replacing 18650 cell . i can acces my laptop through this but problem is. it is showing '' no battery is detected '' and not charging but i can access the laptop

HOBBY TO MAKE (author)backlash072017-02-03

Just try to fully discharge your battery then connect your battery charger to laptop

backlash07 (author)HOBBY TO MAKE2017-02-03

if won't start anymore ?

HOBBY TO MAKE (author)backlash072017-02-03

Just give it a try..it may help

backlash07 (author)HOBBY TO MAKE2017-01-12

thnks bro i will try it

GiovanniR8 (author)2017-06-02

I'm Giovanni from the Philippines and I have to say how easy it was laptop battery repairing simply is (based on the steps presented.) Way too easy in fact that I had my own share of attempts of repairing good batteries that had gone bad instead using roughly similar methods. Then I read a forum discussion in a Battery University website stating that particularly laptop batteries manufactured after 2006 were deemed "smart" batteries (mcu-controlled.) it simply meant that laptop motherboards and their batteries were then designed to have an ability to communicate wherein battery status and performance data be stored in those microcontroller units within the battery itself. After every manufacture of these mostly lithium-ion types of laptop batteries (normally-off meaning no current flowing on either negative or positive leads), the said batteries were then activated by a code ( a serial number perhaps) programmed into it's mcu. This mcu with all of the pertinent data in it will allow the conduction of current and/or voltage in any of the leads so long as the mcu is alive. It simply means then that when all the battery connections are to be severed, the mcu chip with all of it's data stored "dies" and therefore go back to it's normally-off state (in Windows, either you will get a "no battery connected or a connected, not charging" icon..) And as would another forum on lithium-ion batteries in another website would suggest, no way in hell will they ever give anyone the activation code of their mcu chip. Though I did have a few successes of my own but the method I am using is a bit trickier since it involves hot swapping the set of bad ones with that of a good set of batteries all at once. In order not to damage the circuitry or the mcu, both set of batteries (the bad set and the good set) have to be discharge into their most nominal states (about 3v or less for a pack of 6 cells in cells of good condition based on my own experimentations. At this stage I cannot yet post images since I had not yet perfected this technique but at least, the general idea is there.

RobinA47 (author)GiovanniR82017-08-03

Nice . Thanks

jawediqbal (author)2017-07-09

Battery is fully charged…System shut downs after 15-20 minutes…But If plugged in works properly..
What would be the problem?

jawediqbal (author)2017-07-07

my laptop battery shows " 0% available charging, but not charge. what to do????

ShanakaP2 (author)2017-06-29

hi i need your help. i have replaced the cells with new ones. i've tested the batteried before with a power bank case . i have solderd it and put them back in my my laptop but nothngs there .sometimes it says not charging but shows 100% sometimes it says no battery detected however when i unplug my charger it goes off. do you have a solution ??

SooryaK2 (author)2017-06-27

hey, i followed your steps but the laptop still says the battery needs replacement. My laptop battery shows 10.6 V on a multimeter. Can you explain/guess what is wrong?

HOBBY TO MAKE (author)SooryaK22017-06-27

There is nothing wrong try changing it

SooryaK2 (author)HOBBY TO MAKE2017-06-27

This problem is after changing all 6 cells from my battery. I tried the battery never the less, it works. But I figured out that the DATA and the Clock pins are not giving/receiving any feedback to/ from the computer. On closer inspection I figured out that a small SM Capacitor is broken. I am replacing the circuit with another battery from scrap.

عمر صبحيض (author)2017-04-02

thank you very much

Daniel434 (author)2017-02-04

Actually we can recondition battery like this - HERE is simpe way to do this

Ethan1976 (author)2017-01-22

Good idea, thanks ! :) I used this guide to recondition laptop battery

backlash07 (author)2017-01-09

hey bro i need help, i think my laptop battry is dead. i need to replace it but the problem is i cannt find any similar type of my battery. battery is 6 cell battery of 18650 without battery box, there is a lebel on one of them " battery pack c14-s6-3s2p4400-0
rating 10.8v dc::4400ah/47.52wh . my question is which 18650 cell x 6 model will suitable for this. there is no detail writen on the cell about the mah and voltage

HOBBY TO MAKE (author)backlash072017-01-09

You can use any 18650 model cell found in almost all the laptop batteries..

Actually there are 6 cell INSIDE each laptop Battery....
Just make sure you don't damage your battery plastic cover and circuit because as you said you could not find any correct match for your replacement.....

Just harvest 6 good cells from any dead batteries..
And replace it with yours...one

Joseph Briner (author)2016-12-18

Thank you :) Good instruction. Actually we can recondition all types of batteries

Battery reconditioning guide - very cool way

Classyamin (author)2016-12-05

Hi there. It was a very complete and useful help that you made. Thank u for that.
Also i have a problem, after changing the battery cells with another used pack cells,laptop detects the battery and says it's charging, but for real, no charge is added. The percentage stays still.
I donno what to do. I checked the circuit board and it has no problem. Please help. Thanks in advance.

Very simple
Just buy couple of more dead batteries make sure this time you buy same model batteries to avoid confusion
Or
If the circuit is dead then you can use other circuit from the dead ones....
&
If not, just use the correct cells in YOUR battery pack...(if the circuit is somehow detecting then this also will be solved).....

apreetam (author)2016-12-02

Dear Waqqa

I read your feature "how to repairing laptop batteries "

I am using Compaq 420 notebook using battery cell PH06-Li-ion-10.8v-4300mAh

i have 4 batteries these all shows charging 100 % but showing red cross , as remove charger it shows red alert . It shows 1 Hr 10 minutes but decreasing and works without charger 30- 50 minutes only . I broken one it found that using SANYO magenta colour UR18650A R1112 6 cells . them 2 was showing low voltage but 4 is ok and shows 3.7 V . Can I replace these 4 cell in other bad battery pack or must purchase all 6 new cells to repair . Pl suggest .

What things must be follow when using laptop continues 7-8 hours so battery not spoil, because during 7-8 hours charger also connected to notebook.

Waiting for response.

Apreetam , Delhi , India

apreetam.kumar@gmail.com

HOBBY TO MAKE (author)apreetam2016-12-02

Brother voltage is not the criteria it is just rough estimate...
You need to check the capacity of each cell using professional charger like IMAX b6 or any other.....but
You can also check it by 2200 mAh power bank available easily for 100-150 .....
Then you can finally say the total capacity of cell in mAh..

The good to use for your laptop are above 1500 mAh ...
For for detail
Check out my channel on YouTube

https://www.youtube.com/waqaralamlive
&
https://www.youtube.com/hobbytomake

andrew_california (author)2016-10-13

I like it so much :)

Thanks for the lovely comment

Mohit Singh (author)2016-09-27

I have change the dead laptop (Lenevo 3000 G410) battery with new 18650 but the battery is not detected by laptop, nothing happens when powering up the laptop. When I connect the charger, battery charging lights blink and goes off in five sceonds. I don't understant either ciruit board get locked. Please help and provide any availble solution for this. I don't want to through my new 6 x 18650 cell.

Rupender (author)2016-09-06

it is easy to understand whole thing in this note. "'bro'"...

HOBBY TO MAKE (author)Rupender2016-09-06

Thanks for this response...

Antonius VincentM (author)2016-07-19

if i add some Li-Po in circuit can it increase some capacity or rather damaging the circuit?

(Sorry for so late response)
Yes ,
If you connect it properly by soldering or spot welding.

sssha30081997 (author)2016-04-24

smart

Thanks bro...

ftfallata (author)2016-04-24

I like it

HOBBY TO MAKE (author)ftfallata2016-04-25

Thanks for the comment

fahking (author)2016-04-19

not even one mention of how highly dangerous, explosive and flammable lithium-ion batteries can be. I expect natural selection maybe at work here!

UncleEd (author)2016-04-07

>>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.

HOBBY TO MAKE (author)UncleEd2016-04-19

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)

ugur23 (author)HOBBY TO MAKE2016-04-19

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.

HOBBY TO MAKE (author)ugur232016-04-19

Thanks for the detailed commect..!!!

MarkP176 (author)UncleEd2016-04-19

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.

UncleEd (author)MarkP1762016-04-19

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.

thalian (author)UncleEd2016-04-07

I was going to add the same thought!

HOBBY TO MAKE (author)UncleEd2016-04-07

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.

dan.blake.7583 (author)2016-04-07

So if I have this right, you take a good, but old L.T. battery apart, and put the individual batteries in the bad L.T. battery ?

If the LT batt. you're starting with is "old" the batteries in it aren't any better than the ones you have. Otherwise, the "new" batt. would be very good and valuable. Where do you get a "good" LT batt. free or cheap ? Why not just get a good used one that fits your LT ?

But wait, you can't find good used LT batteries...ANYWHERE !

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