Hi,
Try creating a [https://www.windowscentral.com/generate-battery-report-windows-10|Win 10 battery report] and check the status of the battery.
If the battery is faulty, here’s the [https://download.lenovo.com/consumer/mobiles_pub/330s-14ikb_330s-14ikbx_330s-15ikb_330s-15ikbx_hmm_201903.pdf|hardware maintenance manual] for the laptop.
Go to p.34 to view the necessary pre-requisite steps and then the procedure to remove the battery.
On p.73 part #13 you’ll find the part numbers for the various batteries available for the model (it may also be printed on the original battery as well so that you can verify). If you search online using the part number ''only'' in the search term, you’ll get results for suppliers of the part.