The video gives specific conditions to be met and that is difficult to know on an unknown battery.
Look at the balance plug and notice the brown area, likely overheated or shorted. Was the top already messed with, or was that you?
Use a volt meter across the plug and check each cell voltage. If I understand the video correctly, then the cells should be even and lower than a lipo charger will recognize, at least in lipo mode.
Don't be eager to hook it up to a charge unless you are convinced that it meets the video criteria. Even if it does meet criteria, don't be eager to hook up a battery with an open top.