I have an Inspiron 5567. It’s 1yrs old and the battery shows ~27WH remaining capacity from 42WH (original).
The problem is that after bms reports 0 energy left windows shuts down. If I turn it on it says battery is flat, no more energy left bit still works fine. It can run 2 more hours with ~5000mW power need. So as I calculated there is 10 WH more in the battery. The same at charging. It reaches 99% and stuck there. 10 more WH goes to the battery without problems and then jums to 100% and finishes charging. That 10+27 WH from 42 is looks fine form me for a 1yrs old laptom mainly used from AC power.
I think the battery is ok only the bms coulom counting algorythm is driftied that much. On my other Lenovo laptop the recalibration is done automatically when I do a complete full discharge-full charge-full discharge cycle. I tried the same on this dell without succes. Is there any method or software to recalibrate dell battery capacity counter?