Register ID #37: Charges started with cell < x.xx volts

[JustinMaxwell]

I have an old 12Ah M18 that I accidentally fully disharged while using it for a project. It stopped charging no matter how long I waited. Only giving flashing red/green status on the M18 charger. I'm obsessively curious and eventually stumbled across this project. I think I have more insight into Register ID #37 ("Unknown (almost always 0)")

m.read_id(id_array=[37], force_refresh=False, output='array')
"Unknown (almost always 0)"

My value at ID #37 seems to increment similarly to ID #38. As in, it's related to the number of charges with the battery pack in some unknown state. For me, it's seems to be correlated to Cell #5's Voltage. And ID #38 ("Charge started with a cell < 2.5V") seems to only care about Cell #4.

https://docs.google.com/spreadsheets/d/1ezucde8tpmXamL9an774D2hdkPyMP12lgGw5r7idCd8/edit?usp=sharing

[Tool-Scientist]

Very interesting. I might see if Martin can test with his resistor setup. He's busy at the moment, so might take a few weeks.