How long does the 9v lithium battery last assuming few alarms or calls ?
1999305
with a little fiddling you can add your own battery that can last many days. All you need is 9V and a battery socket for connection. I use a number of 1.5 V batteries.
1999306
At least a year. I disconnected my power source but failed to pull the battery. Battery was dead after 5 days. Battery may last much longer if no power outages. Freeze alarm will let you know when power is out. Not sure if regular Duracell is any worse, performance wise. I have installed standard Duracell now. We'll see.
1595168
Once the battery dies in the sensor, that particular sensor will no longer send a signal to the main alarm unit. I'm finding that the batteries are lasting about 6-8 months.
1648117
I have had mine for years and years but I can't really answer! I use the alarm sound which will go off ten separate times probably 30 sec. Or so apart. I have had on since around 1978-ish and am only on my second one. I t is set for 4 separate alarms. I love the convenience of being able to grab my alarm and a couple containers when we go to my son's for an overnight. Good size too for the purse don't you agree? If you haven't purchased it yet I suggest you do. Enjoy.
387232
There is a simple slide out door on the back of the unit. It uses a 9V battery.
1889228
Mine's been equipped with 9V Mitsubishi alkaline battery, with only one year to expiration date (which makes me think it's six years old) and still seemed to be in a good condition. But that's a good fortune, batteries included happen to be half-dead pretty often. Nevertheless, alarm sensitivity is not related to battery at all. I disassembled the device and the shock sensor is merely a coil spring soldered with its one end to plate and the other end is freely swinging. There's a metal frame around the free end so it touches the frame making a circuit when shock is strong enough. To reduce sensitivity, there's a number of ways, for example, one may make spring more tough (by shortening it a little bit), or put a damper on it.
1390155
I guess it depends on what you classify as "extreme" use. If you have wifi on, GPS on, are concurrently downloading videos while surfing the web, I'd say 9 hours is probably about right. Try it with the OEM battery and see what your battery life is with the same conditions. My guess it is 4 or 5 hours.
1290219
This detector uses a 9V battery. I installed 3 devices in Sept. 2012. At 22 months, batteries still have > 8.5V. I do not know the ultimate battery life for the average situation; however, changing batteries on a schedule (say yearly at a cost of about $1/per battery) or when you detect a battery discharge problem could be a good policy.
96453
Ridiculously often: every 9-12 months. Design flaw in my view, as the 9v models used to last 4-6 years. This newer AA model seems designed to sell batteries, which is unethical engineering. Does First Alert have corporate ties to a battery co?
358190
The battery will last for 10 hours, but only when kept at a moderate volume. If you crank the volume up near max, the battery will last about 5 hours.
2004184
The sensor batteries last two years. The alarms run off 120v with minimal amperage. The alarm batteries will last one year or at least 30 minutes when running. That should be enough time to scare burglar without a UPS. Alarms are very loud.
1992958
Have not had to change a battery yet, of the first three I bought. I have seven now. If it is really windy, the one on back porch screen may go off, but, they reset. I love these alarms.
240701
In my experience used as a backup for a house alarm system this type of battery has lasted for at least 3-4 years or more. I try to change it, though, in 2 to 3 years before it needs replacement.
2022233
Mine seems to last a couple months. Not overly thrilled with the alarm because it would go off all the time for no reason and now it seems to be working fine.
1784647
It's not extremely loud so it won't be distracting, but I would recommend a good battery because mine died after a few uses.
1138333
The battery seems to last a long time .I have had mine for over two years and I may have replaced the batteries once but I am not even sure about that. Bottom line is: how long the battery lasts should not even be a consideration when deciding to buy. I love the darn thing. I just wish I could find out how to turn the alarm off.
385848
I have had more than three hours out of the battery life. In fact it is more like 9 months and it is used regularly.
1408905
Battery life depends on how much time unit is in alarm condition. If it never goes off, they'll probably last a year, but it also depends on the batteries and the environmental conditions.