What is a brand of your first light green cells?

Paste a picture of marking

@itz_saad this is how IR should be looking with good quality cells 3S 2P

@djibattworkshop

They also 3.7v rated so could not be used in that battery with existing chip settings. 

Ask your supplier for LiHv cells with 3.8v rating designed for 4.30 or 4.35v full charge. 

For example Samsung cells with 'A' suffix, like '28A', '30A', '32A'. 

By the way how you connecting the cells in parallel?

Are you using spot-welding technology? 

@itz_saad 

Something is wrong here. I propose the following:

- take one set of new cells (all from the same batch), measure the voltage to be as close as possible and connect them to another PCB

- post picture with IR measurements

I want to exclude any malfunctions in computing the current and reading cells voltage under load by the chip, to exclude PCB issues.

Another thing, I recommend you to buy a tool to measure the IR using the AC method, a tester like this will tell you in seconds how good are the cells: https://www.aliexpress.com/item/1005003375808437.html

@djibattworkshop no we are not using spot welding

Right now we are struggling to get supported cells after that i willl go  for the spot welding technique 

How are you checking that which cells are supported by this chip ? Please guide

@azzido ok i will find another faulty battery and connect these cells with new chip and post pictures here

Ok so IR device is also needed..i am gonna place the order..is there anything else i should order ?

Posted by: @itz_saad

no we are not using spot welding

Then how you connected cells? 

Posted by: @itz_saad

How are you checking that which cells are supported by this chip ?

By referring to datasheet of originally installed cells. Also by observing Charging Voltage and Design Voltage parameters.

Your battery uses Samsung ICR18650-28A. Lets check the datasheet.

https://secondlifestorage.com/index.php?threads/samsung-icr18650-28a-cell-specifications.1772/

http://www.meircell.co.il/files/Samsung%20ICR18650-28A.pdf

Your battery has 3S2P configuration. 

Charging Voltage is 12900mV

12900 / 3 = 4300mV

Posted by: @itz_saad

How are you checking that which cells are supported by this chip ? Please guide

For my occasional spot welding tasks I use this portable spot welder: https://www.aliexpress.com/item/1005003028088276.html?spm=a2g0o.productlist.0.0.92d93b2eJdRo8E&algo_pvid=97a38667-07ae-4781-a77f-f3ead98ec3d5&algo_exp_id=97a38667-07ae-4781-a77f-f3ead98ec3d5-0&pdp_ext_f=%7B%22sku_id%22%3A%2212000023337960264%22%7D&pdp_pi=-1%3B70.11%3B-1%3B-1%40salePrice%3BUSD%3Bsearch-mainSearch

You also need nickel strips because you can't use wires.

Posted by: @itz_saad

Ok so IR device is also needed..i am gonna place the order..is there anything else i should order ?

Please check the forum. The questions you are asking was answered a lot of times. We have thousands of customers and its counterproductive to answer to everyone same things thousands times. 

@itz_saad I am also from Pakistan and using this marvelous device...we can share some battery cell locations with each other to buy quality cells, My Whatsapp (+92 305 6553853). I am waiting for your message.

@djibattworkshop in case of cells SAMSUNG 28A wich chemistry ID do you recommend to use on bqstudio?

 In bqStudio there is sort option in Chemistry updater so you could find interested cells and its chemistry number. 

 For Samsung 18650 28A it was initially used 0305 tables but now TI recommends to use 0343.