Here is a review left by a customer on a product. Would you say he was satisfied or dissatisfied?
Title: 10-year, my eye
Review: I bought four of these Ultralife "10-year" batteries (http://www.amazon.com/gp/product/B00004W3ZE/) in the spring of 2009 for our battery-operated smoke alarms and as backups for our wired alarms. They started failing earlier this year. The last one failed today. In other words, a maximum of 3.5 years -- 35% of advertised OR LESS.One could argue that at $8/3.5=$2.30/year (or more), they're not too different from the recommended replacement of one regular 9v battery each year. But the point of the purchase in the first place was the peace of mind of not having to mess with batteries for practically the life of the alarm. I have to admit I was disappointed.
