Hi,
Create a [https://www.windowscentral.com/generate-battery-report-windows-10|battery report] and compare the ''Design Capacity'' value versus the ''Full Charge'' capacity value.
For a new good battery they should nearly be the same value.
You may just have got a bad battery.
There is a [[Info:Warranty|1 year warranty]] on the battery so if it is faulty getting a replacement should be no problem. Also explain about the "thickness" and the problem you think it caused. They may have got a bad batch who knows?