Some laptop manufacturers do that... once you disconnect the voltage from the BMS, the BMS is efectively dead. If you know it, you can use a power supply to kee

Some laptop manufacturers do that... once you disconnect the voltage from the BMS, the BMS is efectively dead. If you know it, you can use a power supply to keep it energized, if not, tough luck. You can still buy a 3rd party battery to use with that laptop, but the original laptop cannot be "renewed" with new cells anymore.