actual experience with life of battery?
466251
Bought a contractor's pack (6 batteries) for use in smoke detectors. Since we did that in the spring of 2013, I have no way of knowing how long they will last. We found out about these 10 years lithium batteries from the local fire department. That's what they recommended so the batteries didn't have to be replaced every 6 months or once a year
466252
10 years is the *SHELF LIFE* (estimated). When used in something, it won't magically last 10 years unless that something has a very low current draw.Alkaline 9V batteries might have 550-650 mAh, and Lithium 9V batteries might be 1200-1300, so really you're talking about doubling the capacity, but with a longer shelf life.In other words, don't pay attention to just the shelf life or you'll be in for a shock when it only lasts twice as long in a smoke detector... just bad marketing there, or customers paying attention to the wrong metrics of comparison.
466253
10 years is the *SHELF LIFE* (estimated). When used in something, it won't magically last 10 years unless that something has a very low current draw. Alkaline 9V batteries might have 550-650 mAh, and Lithium 9V batteries might be 1200-1300, so really you're talking about doubling the capacity, but with a longer shelf life. In other words, don't pay attention to just the shelf life or you'll be in for a shock when it only lasts twice as long in a smoke detector... just bad marketing there, or customers paying attention to the wrong metrics of comparison.
466254
I didn't do any scientific measurement. My opnion is therefore subjecive. It appears that these batteries do last. This key is to get them fresh. Batteries do lose power with time if you let them sit. Some lithium button batteries that I purchased on e-bay were two years old and lasted about a week in my guitar tuner, which is way too short. I blame it on the age of the batteries. Those 9 volt lithium batteries don't seem to have this issue. We'll see in a few years.
466255
I purchased the batteries earlier this year to replace the batteries in my smoke and carbon monoxide detectors. I put one in my alarm clock and left it unplugged for 7 days. It is still working. The last time I did that the clocked stopped after two days. I cannot give you a longer time review than 6 months.
466256
TOTALLY depends on what you use it in. Even two of the SAME devices may have a different draw on the battery.
466257
I use these batteries in some burglar alarm sensors, and mark the date of installation. Most of the time (in at least half a dozen instances), I will get between 2 - 3.5 years of service on the Ultralife batteries. It's not 10 years, but it is far more than I would get from a standard alkaline.
466258
It seems these batteries are just a smidgen larger than a standard nine bolt battery. I have use them in my smoke detectors. So far I'm thrilled with them so I just hope that they do as advertised and that's last a long time
847347
I would say there is no set answer to this question, the actual battery life that you experience will depend on your usage and maintainence of the device. My battery usually lasts about 8 days at about 2 hours or so a day, so about 16 hours roughly. YMMV!
107006
Hi W.J.Two thoughts here. First, I'm not happy with the performance of the battery's life -- seem to work OK for low power items (i.e. wireless mouse), but fall way short of the mark for higher demand items (flashlight) -- I'd guess 10 to 15% of an Alkaline battery life. That said, and in all fairness, it appears there were a number of 'knock-offs' introduced into the selling stream. I'm not sure if mine were part of the counterfit lot.The customer service group at Eneloop aren't the easiest to work with either. I invested about $350 in batteries, cases, charger, sleeves. I wish I could get my money back and move on.Sorry to share my disappointing experience. I hope yours is better. Hi W.J.Two thoughts here. First, I'm not happy with the performance of the battery's life -- seem to work OK for low power items (i.e. wireless mouse), but fall way short of the mark for higher demand items (flashlight) -- I'd guess 10 to 15% of an Alkaline battery life. That said, and in all fairness, it appears there were a number of 'knock-offs' introduced into the selling stream. I'm not sure if mine were part of the counterfit lot.The customer service group at Eneloop aren't the easiest to work with either. I invested about $350 in batteries, cases,... » Read More Hi W.J.Two thoughts here. First, I'm not happy with the performance of the battery's life -- seem to work OK for low power items (i.e. wireless mouse), but fall way short of the mark for higher demand items (flashlight) -- I'd guess 10 to 15% of an Alkaline battery life. That said, and in all fairness, it appears there were a number of 'knock-offs' introduced into the selling stream. I'm not sure if mine were part of the counterfit lot.The customer service group at Eneloop aren't the easiest to work with either. I invested about $350 in batteries, cases, charger, sleeves. I wish I could get my money back and move on.Sorry to share my disappointing experience. I hope yours is better. « Show Less
116861
I just got the 16GB for Christmas. After reading all the battery posts, the first thing I did was charge it fully, then play it until the battery died. I got 20+ hours. I think a lot has to do with how often the screen is "lit". If you're constantly shuffling through, picking songs, adjusting volume etc. i think one would get less life than just playing it like I did (the screen was black most of the time since I wasn't adjusting anything). And of course, i would expect video or games to kill the battery even quicker. That would be a good test, play a video straight through and see the life. I don't have any videos loaded, so I can't really test that.
1940015
I've had it for about two years now, and the battery life on it is about two hours, give or take. It's definitely better than the one I replaced, though. I'm still a little disappointed that I have to practically keep my laptop plugged in just to be able to use it for longer periods. Hope this helps!
771803
I have had mine for several months and I still get 3+ hours on a charge.. Awesome battery for the money IMO.
2031150
Battery life is pretty good... A whole day if your actually using it.. I've left it sitting and it's lasted around 3 weeks without usage on one charge.
137204
I havent tried to be honest. The longest so far is couple of days, but i havent lost anything out of it so far. I think if u keep it for a month u might lose just a bar of its light indicator which could account for 2 to 5% of its overall due to its internal connections lost. Which is nornal for these kind of devices. But i normally keep it on the charge when i am not using it at home.
21007
I don't and have no problems with battery life. Some years ago you were supposed to remove the batteries, but I think battery chemistry has changed since then.
340029
An swer here..when i purchased the batterys i was looking for a good long lasting battery an not a legal battle over technical stuff. Also in your question you wrote with current tech only about 3600mah. Notice the word about! You may be correct but you may not have found all the facts yet either. But beside all the technical an nit picking things it is a good battery an has served its purpose for me so far.
148041
I have actually tested the battery life at maximum use. From fully charged, I had the screen at 100% brightness, and going online, I was watching videos. My battery lasted a little bit more than 4 1/2 hours before it went to 0%.
255433
I received a 4th Generation for Christmas and have no trouble with batterylife. I often listen to audiobooks as well as listening at work. I don't have a charging station at work and can usually go at least 2 full working days (8 hour days) without charging.
1300238
I haven't had any issues. I have left it on the charger for a few days and I have not seen a difference in battery life.
202618
Well, unfortunately I'm not an avid gamer so I am not on it that often, but I have found that if you have it in sleep mode it does a very good job of retaining power. If I were to estimate, if you played it as much as the average owner, I would say you could get a guaranteed couple days out of it...I might even venture and say three days. Again thats just a guess. You might wanna poke around online and google some sites that will give you some good insight on the battery life. Hope I was able to help at least a little. Have fun and keep gaming! ;)
97918
Not sure about the warranty but as far as I'm concern it was worth the money. I used to go out on one battery and come back on the other. Not anymore, to me its well worth it.
693685
Mine has been awesome. Charged it the first time and took it deer hunting and used it a lot without it going out or needing another charge. Have been using it here at the house to do chores in the evenings. I just charged it back up last weekend. I would comfortly say I have had it on for well over 6 hours on the initial charge. The last week here as been below zero and I have had to use it out working and it has not fadded at all. I'd ask for a replacement if at all possible.
1228611
My experience has ben different. Have had system running for five months and batteries still running and show 2/3 charge left. Due to other's comments, I bought a bulk pack of the batteries in advance, but have yet to use them.