
Battery gave 83 hours of performance where I would expect 20 hours with a normal 9V. Great value. Fits my needs very well.
Holy shmokes this battery works well! My shmoke alarm doesn't beep anymore! Thanks RadioShack!
As a DoD contractor, I use Lithium Batteries all of the time. On the average one can find this battery for lower prices. Usually between 5 and 6 dollars. However, Lithium is longer lasting thus ensuring longer operational support. I don't have the specifications of each battery to do a comparison between Ultra-Life and other vendors. It would be interesting to see the life-cycle comparisons.