Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Disappointed

Don't get me wrong, I love my Kindle. But something is wrong with the replacement battery. The original battery lasted just shy of 2 years. That was fair, and so I didn't hesitate to order a replacement one that is supposed to be exactly the same. Unfortunately, it lasted less than 4 months. What gives Amazon? That's not even close to the original. And, while I love e-books, there's got to be nothing worse than a dead battery on vacation. I guess a paperback is the way to travel.