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Title: Dead in a little over two years
Review: I have a smoke detector on a high ceiling, and changing battery is a lot of pain. Therefore I decided to put in the so-called 10-year battery and hoped I won't have to worry about it. It died in a bit over two years. Ironically, the regular, non ultra-life 9V batteries that I put in about the same time in my other detectors still run fine.
