8 month old power bank not charging after not being in use for a few months. Amazon listings for entire brand taken down. Is it dead?

I think I sadly know the answer to this but eight months ago I ordered a power bank before I became homeless so I could have a reliable way to charge my devices. I haven’t needed it the past couple of months so it hasn’t been used- but now that I want to use it again it’s not charging at all. The lights come on and the number blinks as if it’s charging, but forty minutes of charging didn’t even raise the battery percentage by 1%.

I think it might be dead, the brand is LOHAO and every LOHAO listing I can find on Amazon is now gone. It’s 80000mAh and was around eighty dollars because that’s all I could afford at the time- so I’m assuming for the size it’s on the cheaper side and is most likely toast from being.. well.. cheap.

I tried “resetting” it by holding the power button, but it seems as if there is no way to reset this unit- and if there is it’s some weird way that I can’t figure out.

Should I just let it charge overnight and see what happens or do you think that would be dangerous?