IMAX B6 calibration problem

Carlos Cobo (carco11)

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Dec 30, 2023, 7:13:01 AM12/30/23

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Hello all, I have installed cheali on my b6AC (possibly a clone but with original layout), i have followed the complete calibration process with a six 1s batteries on a serie board so it is equivalent to a 6s battery.

I have also done the expert calibration of vb0 with a 1.5 V battery, vb1 with 1s, vb2 with 2s , vplus with 2s and vminus with 1s.

After that i found that the calibration has an error of 10-30 mV only on cell 1 and 2.

I have also tried to repeat the process after the charger has heated to take into account thermal drift of opamps and resistors. I have attached a table of measurements after this last calibration. Screenshot 2023-12-30 130324.png

Carlos Cobo (carco11)

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Dec 30, 2023, 7:22:51 AM12/30/23

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I have used this fw cheali-charger-imaxB6-original_2.00-e10.3.12-20160613_atmega32.

And here are some pics of the board

WhatsApp Image 2023-12-30 at 13.15.01_0d0d16ef.jpg

WhatsApp Image 2023-12-30 at 13.15.00_94bbfe1b.jpg

WhatsApp Image 2023-12-30 at 13.15.01_3c443fdb.jpg

Carlos Cobo (carco11)

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Jan 16, 2024, 2:18:51 PMJan 16

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I have done a rework and changed all the resistors of the sensing of vb1 vb2 and Vb0.

I can add now another photo of the pcb. My problem seems to be related to the calibration being not consistent over time. I can calibrate it and will work perfect but the next day it will have a 50mV shift on VB1 or VB2

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