Hello guys,
I have an HP Elitebook Folio 9470m laptop whose battery was only providing around 1 hr of backup so I decided to open the battery and check individual cell capacity to know if there was only 1 bad cell to be replaced. So I charged and discharged each individual cell using a battery tester module to their capacity. Unfortunately all four of the cells were at same capacity as all were degraded with time so decided to repack and continue using this battery until its end of life.
But when I reconnected it back to laptop it neither charges nor gives any backup despite showing battery status as available and "plugged in" in Windows status bar. The status light turns on for only 2-3 seconds when I connect the charger and then turns off indefinitely until I disconnect and connect again.
It assume that because of charging/discharging individual cells there is some kind of tamper detection triggered in BMS and now I need to reset that trigger to make it working again. The battery connector to laptop has eight pins. Marked from left to right as 2 pins -ve rail, BI, T, C, D and 2 pins +ve rail. There is no voltage between -ve and +ve or between -ve and any other pin. However I can measure voltage between connector's -ve and each cell's individual voltage. However there are arbitrary voltages between +ve and BI, T, C and D pins.
Right now all four Lipo cells are charged up to 4.1 V each and it is showing 89% charged in Windows. I have uninstalled/reinstalled drivers as well as tried pressing power button for 30 seconds after removing the battery as I got these suggestions from Google search. There is no setting in the BIOS as well.
Attaching pictures below for reference,