6 pieces of such batteries, with such a defect.

Are the batteries china clones?

Discharge has been cut off because cells have reached 2.9v and at this stage SOC should already 0%.

Did you run proper calibration cycles required for impedance tracking gauges?

Posted by: @torture

because cells have reached 2.9v

 cells voltages dropped under the load even lower to unsafe 2.5v level, then chip stopped discharge 

 2.9 is a voltage at the cursor position 

Me pretty sure cells capacity is below FCC value, about 8...10% less then it. 

Posted by: @djibattworkshop

cells voltages dropped under the load even lower to unsafe 2.5v level, then chip stopped discharge

Yes i missed this.

Posted by: @djibattworkshop

Me pretty sure cells capacity is below FCC value, about 8...10% less then it.

For sure.

Batteries are not original, copies. But they have a chip that the tester can work with.
I thought the tester could solve the problem ?
The calibration process successfully completes the charging process to 100%, but stops on the process - discharging, gives an error, cannot discharge to 0%.
Can you write what actions need to be taken so that the calibration is successful ?

Posted by: @battery-salesman

I thought the tester could solve the problem ?

The problem is with cells which not have declared design capacity. Thats why discharge to 0% not possible and tester could not solve cells issues. It looks like battery manufacturer installed cheap low quality cells with less capacity then declared. 

Could you paste a picture from Calibration tab to check a capacity measured by tester ? 

So as it was expected, cells not have declared capacity. 

Instead of 2500mAh they have 1717mAh only. 

FCC is overestimated and chip shut down a battery output to prevent cells damage thats why discharge to 0% not possible. 

You could try to relearn the chip for real capacity. 

Posted by: @djibattworkshop

So as it was expected, cells not have declared capacity. 

Instead of 2500mAh they have 1717mAh only. 

FCC is overestimated and chip shut down a battery output to prevent cells damage thats why discharge to 0% not possible. 

You could try to relearn the chip for real capacity. 

How to do it ?
Now   MaxError = 1 %

Posted by: @battery-salesman

How to do it ?

- Charge the battery to 100% 

- Disconnect Vbat wire

- Let it relax for at least 2 hours

- Connect back Vbat wire

- Discharge the battery to 3.0v per cell, dont allow the Tester to drain a battery to 2.45v, stop discharge manually as soon as 3.0v on any cell reached

- Disconnect Vbat wire

- Let it relax for at least 5 hours

- Connect back Vbat wire

- Charge the battery to 100% 

Posted by: @djibattworkshop

Posted by: @battery-salesman

How to do it ?

- Charge the battery to 100% 

- Disconnect Vbat wire

- Let it relax for at least 2 hours

- Connect back Vbat wire

- Discharge the battery to 3.0v per cell, dont allow the Tester to drain a battery to 2.45v, stop discharge manually as soon as 3.0v on any cell reached

- Disconnect Vbat wire

- Let it relax for at least 5 hours

- Connect back Vbat wire

- Charge the battery to 100% 

 

Thank you.
The question arises, does the tester not work out the set limit for a discharge of 3 Volts?
Screenshot attached.

No, discharge should be stopped manually, otherwise tester could drain the cells below safe limits. 

Posted by: @djibattworkshop

No, discharge should be stopped manually, otherwise tester could drain the cells below safe limits. 

I got it. Why is 3000 mV set in the tester? The tester ignores this value and discharges the cells below 3000 mV.