Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Do no buy this product!!

The nyko battery pack is not worth buying, first off it barely fits in the 360 controller it actually slightly cracked mine, I was willing to over look that as long as it worked which it did, for about 2 weeks then it would not charge anymore and to top it off nyko has so far ignore my e mails asking for help, spend the extra money and go for the microsoft battery pack youll be glad you did.