ULTRA LIFE, 10 year, smoke alarm battery, U9VL-X
by Ultra Life Battery
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Tools and Hardware Reviews of ULTRA LIFE, 10 year, smoke alarm battery, U9VL-X
Customer Review: 10 year batteries;
Summary: 5 Stars
The are great batteries and they do last 10 years in your smoke alarms and an excellant price.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: Lithium Batteries Are Good For High Ceiling Smoke Alarms
Summary: 4 Stars
I can't comment on this particular battery, but I will comment on this subject generally. We have 7 smoke alarms in our house -- building code overkill. One of our ceilings is 14 feet high. There is much more danger that I will be seriously injured in falling off of a ladder by replacing that high ceiling battery once a year than I will be injured in a house fire. But no one thought of the big picture or asked me when they built my house. And when that high ceiling battery starts to chirp in the middle of the night because it is low, forget about getting any more sleep. And you will be in fine condition to climb a tall ladder in the morning.
Lithium batteries should last 5-7 years, so that means I subject myself to falling from a ladder to one-fifth or one-seventh as often compared to regular batteries. Just be careful. Radio Shack makes Lithium batteries, but they are larger than normal 9 volt batteries and might not fit into your device.
Customer Review: Works as advertised, depending on the type of smoke alarm
Summary: 4 Stars
I had 3 of these installed in smoke alarms in May 2003, so was disappointed when two of them failed after about 4 years, and the last one just began to beep after exactly 5 years.
But then I discovered that the alarms I'm using have dual sensors (First Alert SA301), containing both an ionization and a photoelectric [these are not hard-wired, the battery does it all]. Therefore, if in reality, the batteries are running two detectors at once, I guess it shouldn't surprise me that they lasted half as long as advertised. Also, my alarm doesn't qualify for the 10 year warranty, because it contains a photoelectric sensor - the warranty is for ionization sensors only.
Cost wise it's probably a wash, one could buy several alkalines for the cost of this one. But the savings is on time: not having to change the batteries as often.
Customer Review: Good battery, but doesn't last 10 years
Summary: 4 Stars
This is a very good lithium battery. As others have noted, the "10 year" is misleading. We use these lithium batteries in our ADT alarm system wireless window alarm sensors and in some water-leak detectors in basement. All require juice 24 x 7 and they last about 4-5 years; a normal 9v battery would last less than a year. So these are good for applications that need power over a long-life, just forget the ten year claim and think in the range of three to five years. The battery is a "5" in my view but I rate a "4" due to the misleading claim.