3 Possible Soltion for your Lenovo when AC adapter not recognized / Main battery will not charge

The BIOS/EC should be tried first before replacing any parts. The battery and AC adapter should not need replacing. For any system where the BIOS/EC update does not resolve the reported conditions:
Replace the systemboard.
Be sure BIOS/EC version is at 1.22 (R0FET42W) - 1.05 (R0FHT17W) or newer.

Sales of today: Brand new lenovo ideapad z50-75 battery 14.4V 2800mAh laptop batteries

Voltage: 14.4V
Capacity: 2800mAh (41Wh)
Battery cells: 4-cell
Chemical: Li-ion
Battery Color: white
Condition: new original battery
Warranty: 9 months