Given the task definition and input, reply with output. Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.

I just got the adapter today, I plugged it into my iBook G4, and I was able to turn it on, but the battery doesn't charge, and after a minute or two, the screen dims and the laptop goes to sleep. Buyers beware! You might consider an official Apple adapter!
Negative