Why isn't my Job Rocker not charging?

When I plug my Job Rocker into the wall, the green charging light illuminates then slowly fades out almost instantly. I checked the fuse and it seemed fine but I'm not really sure if I know what I'm looking for.

The problem seems to be that it won't actually charge. I plug it into the wall and basically nothing happens. It works though, that's what's strange. I also plugged in my phone to the Job Rocker while the speaker was plugged into the wall and my phone began to charge. This also made me feel like the Fuse was fine.

Why won't my speaker charge up? Terribly confused.
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