Battery or charging cable malfunction?

This is not my exact model shark rocket pro. I got mine new about 6 months ago. Love it, but suddenly will not charge. I have removed the 21.6V 1900mAh Li Ion batt (model# xfbt620) and tested with a multimeter. On top side it is marked with Right and Left indicators. When flipped over you can see TWO connections/ports on the left and ONE in the right. I placed - probe on right connector, and + probe on the inside connector on left = 19.8V

When I place the +probe on the outside connector on left side, I get 0 V.

I assume this means the batt is toast but hoping to confirm my analysis. Should I could test for continuity on the charger wire? Any help appreciated. So aggravated w idea of dropping 25%+of original purchase price to get it running again so soon 🙄