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They all came with Ultralife Lithium Power Cell batteries.
I can no longer recommend this brand of battery and would caution others to be aware of batteries made by suppliers with certain factories in China.
This lasts longer than an alkaline battery, but you are unlikely to get 10 years from this battery.
Now I don't have to use an extension ladder annually to replace batteries in my smoke detectors on my cathedral ceiling. Read morePublished 10 days ago by budfor
Thanks to you the annoying low battery VOICE from our smoke detector is GONE and you PROVIDE EXCELLENT CUSTOMER SERVICE!!!Published 2 months ago by Sonia McDade
These batteries claim to work for 10 years - they do not! I ended up replacing all with Energizer lithium batteries, which work much longer than these. Read morePublished 2 months ago by Rashmi Kumar
I use these in my hard to reach places that I do not want to reach every year like smoke detectors. I already have a bunch of these in my smoke detectors and so far no annoying... Read morePublished 3 months ago by Denise Elkin-andrews
So far are working fine. Contact me in ten years for my full report. I'll let you know how their working.Published 3 months ago by TIMOTHY J. KLOSOWSKI Sr
It's great that you don't have to change your battery every six months. It will be interesting to see how well it stands up. The price is worth it, if it last as long as ten years. Read morePublished 4 months ago by Love2Learn
Hated changing batteries in my smoke alarm. Now just have to do it every 10 years . Why did it take so long to find?Published 4 months ago by Jean Lucero
I bought and installed six of these batteries in 2006. One of them lasted 7 years; one lasted 8 years; the other four are still going (it's 2014 now). Read morePublished 5 months ago by Eric