ULTRA LIFE, 10 year, smoke alarm battery, U9VL-X
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Tools and Hardware Reviews of ULTRA LIFE, 10 year, smoke alarm battery, U9VL-X
Customer Review: Better than current alternatives.
Summary: 4 Stars
Cannot add much to the other reviews in terms of the technical aspects of its longevity or suitability for use in specific applications. However, the company does warranty this battery for use in an ionizing smoke detector for 10 years; no other manufacturer is going to do that. [...]
They are very involved in developing batteries for special applications and customers such as the military. Take it from someone who once worked in the Army command responsible for R&D on power technology. The military needs batteries with some serious in use and on shelf lifetimes. So if any company could develop a battery they are willing to give a 10yr warranty, albeit limited, it is this company. And given the amount of money the military spends on R&D in this area, this company also has the resources to develop something along this line. The caveat here is just like it is for computers and stocks, past performance and what some one gets out of their configuration is not always guaranteed for other users.
Customer Review: Dead in 17 months in smoke alarm
Summary: 1 Stars
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.Customer Review: Dead in a little over two years
Summary: 1 Stars
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.Customer Review: Decade Batteries
Summary: 5 Stars
Forget about changing the batteries on the smoke detector on Daylight Savings day, these batteries let you wait until your kids grow up.Customer Review: Did not work for me
Summary: 1 Stars
I have the an Ultralife 10 Year Smoke Detector Battery model U9VL-J. It has a use by date of 2017. The battery was installed in an ionization smoke detector on 07/05/2007. It was purchased 1-2 years before that. The detector just began giving the low battery warning on 4/30/2008. It did not even last a year. I generally get at least a year out of regular alkaline batteries in this detector. Maybe this battery is better suited to backup applications where the primary power source is house current.