Instruct: Classify Amazon reviews into positive or negative sentiment
Query: piece of crap...

i bought this because i wanted an extra adapter. i never touched it and left it in the box for about 3 months. i finally opened the box and tried it out. it worked perfectly for about 10 minutes. then it started losing power and then it just stopped working. i know there is nothing wrong with my laptop because it works fine with my other adapter. i feel like i've been ripped off. if you're thinking about buying one i recommend you go to HP.com and buy one there.