Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Worked, until it didn't.

There's not much that I can say about this product, except that it worked until it didn't.I would like to express my disappointment, though. After only a small handful of uses it stopped working less than two years after purchase. I always followed directions to ensure good battery life. Alas, it just stopped working and will no longer charge.I would stay away.