bcs from this official dell site https://www.dell.com/support/manuals/en-us/latitude-14-5490-laptop%20/lat_5490_om/battery-specifications?guid=guid-2fc673cd-f09c-45d0-84ec-e985cd3a8f1b&lang=en-us and other shop sites it says that 51 wh battery have highter voltage than 68 wh and i thought its...