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Review title: Dead in 17 months in smoke alarm
Product review: Dead in 17 months. These things are supposed to last up to 10 years in an electric smoke alarm, i.e. it doesn't power the smoke alarm, it's just there as a backup in case of power failure. Well, I purchased 14 of these, and after 17 months, two have already failed (typical beep in the middle of the night, why does it always happen at night?) and I fully expect the rest to start failing one by one. Go for another brand or stick with regular alkaline for a fraction of the cost.
