Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Sony batteries are VERY disapointing

This is the fourth in a series of batteries that I have gotten for the two Vaios I own. They barely last the year and the performance drops to less than half. I dont know if it is the charge circuits or the battery, but I have never seen such terrible performance. Although I like most Sony products, I will be avoiding Sony laptops in the future.