Instruct: Classify the given review into positive or negative sentiment.
Query: Does not last 10Years

When I bought a house, I installed 6 of these throughout the house since there were none present when I moved in. This was August of 2009. As of today, February 2012 I have just had a third one of the original six start chirping that the battery is low. This is well short of their 10 year rated life. I am pretty sure that some of them have never been set off. I test them about 3-4 times a year (they state you should test them weekly).\Other than the battery going out WAY too soon, I have really liked these. They have not had issues with false alarms, even in my kitchen. They are easy to instal and remove.The battery life just sucks. If they were 9V batteries, I could just replace them, but now I have to go buy all new detectors. Maybe this time I can find some of the old style with replaceable batteries.