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Review title: Amazing Staying Power
Product review: I have used several of these batteries in applications _other_ than Smoke Alarms - in fact, I wouldn't waste one in a smoke alarm: I use them for stun-guns and Pak-Lite led flashlights and so forth. To date, I have never encountered a dud, and all the Ultralifes I have used so far performed just as one would expect of a lithium cell vs. an alkaline battery.
