Inaccurate voltage for cells 1 and 2 when charging about cheali-charger HOT 8 CLOSED

Yes , your AVR was locked when you did this backup. You can see patternn in there (ignoring addressing columns).
Compare it visually for exame with this hex file https://github.com/stawel/cheali-charger/blob/master/hex/unstable/cheali-charger-ADCKeyboardAnalyzer-150W_2.02-e10.3.12-20230523_atmega32.hex

from cheali-charger.

Hi, i have a read out from my Accucell6 50W before the Atmega32L were blocked somehow (restore in progress with hvpp). I never tried to reflash the stock fw and i don't know if it is a valid read out. Maybe someone experienced can investigate it...
accucel6-50w-oem.txt

from cheali-charger.

@RadioControl according to this your dump is useless :(

from cheali-charger.

@RadioControl I found a working backup. Not from this exact model, but it works.
https://groups.google.com/g/cheali-charger/c/pz4mmbuzVj0

Unfortunately, it is also showing 4.16 V for cell 1 when charging while in reality it is 3.96 V. I guess my unit is faulty. Any comments are welcome. I will be closing this issue in a day or two.

from cheali-charger.

Ok, thanks for the info!

from cheali-charger.

@intelligentpotato

Turnigy Accucell 6 50W running v2.00_20160613.

What is the exact name of the hex file you used?

upd: in the expert calibration menu I only have Vplus and Vminus

if you don't have "Vb0pin", "Vb1pin", Vb2pin" you have flashed a version with "more advanced voltage measurement on first two cells", see: differences-between-versions
that's a wrong one (or maybe the old versions didn't have one? I don't remember)

I would try this:

1. flash you charger with: cheali-charger-Turnigy-Accucel-6-50W-5A_2.02-e10.3.12-[date]_atmega32.hex
2. make sure you have "Vb0pin", "Vb1pin", Vb2pin" in "options"->"calibrate"->"expert DANGER!"
3. reset charger: "options"->"reset default"
4. calibrate charger normally (no need for "expert DANGER!" yet)
5. check voltages during charge
6. if voltages are still off: do "expert DANGER!"
7. check voltages during charge
8. if voltages are still off: hm... maybe your charger is damaged, repair charger: more info on that when 1.-7. fails

from cheali-charger.

@stawel oh man, works like a charm! Internal resistance and cell voltage measurement are perfectly on point even without the expert calibration. So it turns out I'd been struggling for months due to my own indiscretion.
upd: What's the difference between cheali-charger-Turnigy-Accucel-6-50W-5A and cheali-charger-Turnigy-Accucel-6-50W-6A firmwares? I believe I was running the 6A since that's what's written on my charger.

from cheali-charger.

@stawel
@diggit

can You confirm that my backup is locked?

from cheali-charger.