yashsingh1/xdaforums huggingface dataset:
[Nokia Lumia 900] go0gle:
There should be a chip in there that cuts off the charging when its not needed. BUt overall its really a good idea to take care of your battery, since the L900 has a built in battery.. you are kind of stuck with it. I don't know if Nokia will replace them for free if its starts to loos capacity.

This is a great article on the subject

http://www.allaboutsymbian.com/features/item/14377_Sealed_vs_user-replaceable_bat.php

the basics from it

**** charge as often as you can - Li-Ion batteries last much longer if you don't take them right down to zero% each time. In theory, you can extend the life of the battery from a year (500 charge cycles) up to a decade (5000 cycles).

**** never, ever let the charge run down to ground zero (where the phone turns off) and leave it there for any length of time. Do this and the battery chemistry will start to go into irreversible decline.

A typical chart from industry studies, in this case from the Department of Chemical Engineering, University of South Carolina, Columbia (PDF link). The amount of theory behind the topic and the number of variables are somewhat very scary, but you can take from the chart above that as the number of battery charge cycles goes up, the voltage, capacity and performance all decrease dramatically - starting at 1800mAh, the tested battery was down to 1350mAh after (roughly) a year of simulated use.
[Nokia Lumia 900] rohitgarewal:
+1. My battery has been outstanding. Granted I'm traveling in Brasil right now so don't have LTE (but no way of turning off the radio), but after 16 hours I'm well over 50%, and that's with lots of whatsapp, email, and reviewing notifications. FB chat is turned off.

Awesome phone.
[Nokia Lumia 900] cayano:
Great Battery now!

I had turned off wi-fi most of day today. I unplugged phone at 6am with 100% battery charge and when i came back from work at 4pm my battery was still 57% .This is better than my iphone 4s. This phone is just amazing. I do not mind to turn off wi-fi when i do not need it. I had never turned off wi-fi before, i think this was the problem.
[Nokia Lumia 900] nraudigy2:
Do you guys know if Nokia Drive will run in the background and eat up battery?

Navigation apps on iPhones will eat up the battery in the background.
[Nokia Lumia 900] jimski:
Well as it uses offline maps, only thing running is GPS. And if you have location already turned on, GPS is active. So, probably not.

Sent from my Lumia 900 using Board Express
[Nokia Lumia 900] jimski:
Using the homebrew Battery Meter app, I can tell you that after it reaches 100%, the battery will discharge to 97-99% and then go back up to 100% throughout the night. Adjusts about every 30-40 minutes. So, I don't think staying on the charger hurts. I am not going to worry about it.

Sent from my Lumia 900 using Board Express
[Nokia Lumia 900] bbtm:
Not sure about Nokia Drive but power consumption on my phone seems to be very random. I bought it a week ago. The first few days battery life was amazing. I would get through the day with at least 30% left. Now I run out of juice after 13h.

I got the notification a few days ago and upgraded the software (I assume the one fixing the connectivity issue). Could that be it? I've also been installing more apps including Nokia drive and I use an ATT Microcell in my office.

I downloaded the Nokia Diagnostic tool (dial ##634#) and started regularly checking the discharge rate, turning things on and off (microcell, airplane mode, wifi, location, battery saver). Most of the time the discharge current stabilizes at 350mA (I assume that's per hour). With a 1830 mAH battery, that's 5h15. Then some of the time I get a steady rate of around 100mA. My 13 hours average battery life would indicate an average rate of 140. The only time it seems to stabilize below 100 is with wifi, location and BT off and with battery safer on. Not very useful.

I love the phone but might return it and switch to the Titan2 if I can't resolve the problem.
[Nokia Lumia 900] feedmylittletroll:
make sure the nokia drive app is switched to offline mode. I remember my 800s battery would get drained fast when it was turned to online mode.
[Nokia Lumia 900] Tim.Smith:
Nokia support seems to think 10-12 hours on one charge with moderate use is normal. Unless I am reading it wrong or I asked the question wrong:

https://twitter.com/#!/NokiaHelps/status/193076166440140801

Edit so does Windows Phone support:

https://twitter.com/#!/WinPhoneSupport/status/193077995156668416

Guess I'll just throw it on the charger throughout the day as much as I can.
[Nokia Lumia 900] diehardbattery:
That's about what I'm getting with wifi and bluetooth on for about 85-90% of that time
[Nokia Lumia 900] romup:
my lumia 900 is one the way from usa tu cn
[Nokia Lumia 900] ajpratt:
The microcell is killing your battery. Try turning off the microcell or killing the data connection.
[Nokia Lumia 900] 22-40:
Which one is that?
[Nokia Lumia 900] awesomeindeed:
I've only had mine for 3 days now and in those days I've gotten roughly 20 hours on a charge. I like to think I use my phone a decent amount. About an hour or two of calls per day, a few hundred texts, lots of app use, about 2 hours of music listening and moderate amounts of browsing. BT on all the time as well.

It's on par with my Titan, which generally sees 20-26 hours depending on use.
[Nokia Lumia 900] bbtm:
Being puzzled by the change in battery life, I took the plunge and did a full reset on the phone. I then recreated my email account (one exchange, one Hotmail both setup to download mail every 30min), connected to windows life but did not setup or use any app. I’m still using that microcell in my office and have wifi turned on.

The battery diagnostic consistently showed around 95 mA which should equal to about 20 hours on a charge.

Then I tried to take a picture and the phone requested to turn location on. I did that and the battery discharge current – was back consistently to the 350-400 mA.

Turning location back off brought the discharge rate back down to 95 mA.

I had tried turning off the location service before doing a full reset but it didn’t help. Could this mean that some apps use it even if it’s off?

My plan is to start re-installing one app at a time and keep monitoring the battery to see if I can find a clear culprit.
[Nokia Lumia 900] alodar1:
Go for it man....:p

I've done this too, though not on this device....but I learned exactly what you are intending to find out.

First, there are indeed system combinations that play better together. Period.

There are comibinations that once turned on, are very difficult, if not impossible to turn off.

The same is true for apps. There are some wonderful apps out there. There are some horrible apps out there. But, again, some of these apps, in combination with the system have varying degrees of 'efficency'.

This part really makes me laugh though. People downgrade windows phone because of the size of the marketplace. You can't put 450k apps on your phone. You find the app that works for you, and you continually use it. This is demonstrated everyday by various comments, usually by newbs, here and on various forums.

My 'research' told me:

load only the apps you use regularly

do pay attention to data use

do pay attention to battery life

be aware what each app uses. Location is used by alot of apps and does use alot of power

Free apps use alot of battery life because of the ads. There are some nice articles talking about battery life and ads in apps across all platforms. DO NOT IGNORE THIS.

Uninstalling an app does not always reset the system back tothe way it was.

Sometimes ONLY a factory reset will reset your system correctly.

Consider using Reinstaller to pick and choose your apps. It makes the ability to hard reset easy to stomach.

Use the cloud for your pictures and docs. This makes having to hard reset a little easier to stomach

Another thing, monitor the amount of LIve tiles you actually use. I recall this being an issue when the first v1 phones came out. I can't imagine the issue went away. Microsoft tried to choose a balance between the amount of information you might want to see vs. the impact on battery life. Most people ignored the part about battery life...and insisted on dozens of live tiles.

Anyway, share what you find out. We can all use that information...and whenyou find an app that devours battery...make sure you put that in the app review...others need to know this...

Good luck.
[Nokia Lumia 900] bbtm:
@alodar1

I think you’re spot on. I was going to re-install WP Shortcut Tiles but realized that it uses the location service. So instead I installed Toggle which only claims to use data services. I setup two shortcuts, one for Wifi and one for Airplane Mode and the battery discharge rate shoot up to 450 mA.

Luckily an uninstalled and soft reset seems to have brought me back down to the 95 mA range.

I think this really illustrates your point about making sure you need the app. If I can keep the phone at the 95 mA range with wifi and 4g on, why would I ever turn them off (except getting on an airplane). So why would I need the shortcut.
[Nokia Lumia 900] godfa7h3r:
Got my white Lumia 900 on Friday 4/20. Charged it that night and then used it all weekend fairly heavily. Wifi also on the entire time.

Been off the charger for 36 hours and I still have 10% left. No possible way my original Focus would have even come close to that. I'm very happy with that kind of battery life.
[Nokia Lumia 900] jimski:
Dunno. Just opened Diagnostics and watched the meter for a minute. Hovered between 106 and 137, averaging about 125. It did shoot up to 237-242 for about 10 seconds and then back down again. So lets say an average of 150.

LTE, WiFi on. Location on. Five email syncs, two push. Eight active background tasks and many other Live Tiles using push. I am sure the majority of that average 150 was for the beautiful screen I was gazing at.

Still testing, but so far my drain while the phone is idle has been between 3-4% per hour. Turning WiFi off when my month resets on the 26th to test LTE data usage. Expect the number to drop a little.

The biggest drain while the phone is idle (which is the majority of the time) is your data connection. MicroCells seem to be killing the L900. Don't know why. Things like tiles, email, location, etc., don't amount to all that much by the end of the day. Maybe 15-18% tops. But they add so much to the experience, I am not willing to compromise.

Sent from my Lumia 900 using Board Express
[Nokia Lumia 900] ljwnow:
Lumia 900 is the worst phone I've ever had. I want to get rid of it. Let me know if anyone is interested. It's like brand new.
[Nokia Lumia 900] jimski:
Guess you can't please all of the people all of the time. Thoroughly enjoying mine. Hope you find what you are looking for.

Sent from my Lumia 900 using Board Express
[Nokia Lumia 900] ragingclue:
Don't bother responding to the troll; she's already been at it in other threads in the Lumia subforums. Sad that trolls even troll xda; they should relegate themselves to the fan sites, not this one.
[Nokia Lumia 900] alodar1:
Just to follow up on what has been said by all, I hard reset my device and loaded only the apps I realistically use on a daily basis. They are: Skydrive, Starbucks card, wordament, Toggle, Angry Birds, Flowerz, Cloud music, Nokia Maps and drive, Skype, Bank of America, Creative Studio, Facebook, Twitter and Flixster.

Phone came off the charger at 630am. Its now 130pm...7 hrs? Battery charge is at 93%. I've had 2 phone calls, and a several dozen texts, and a little Internet.. WiFi is on, BT is off.

I just loaded the AccuWeather app. I use Accuweather because it predicts the weather more to my liking. :D Since I have had the weather app on, my Battery has dropped 2%...maybe....3 minutes?

I use most of my battery in the evening.....just before bed.....So...I'm not really concerned about daytime use. But, this battery sure lasts a while....and I think its because of the apps we load more than a lot of other things.
[Nokia Lumia 900] Seed 2.0:
I have 106 apps/games on my phone.

I have 44 tiles on home screen.

I have 3 push emails as soon as they arrive.

I have 7 active background task & 27 advanced background task.

HSPA+ Connection, with WiFi and Messenger active.

Location services on.

I stream 1.5-2 hours of music ~5 days a week through headphones, at work.

I check Windows Phone News app 5 times a day and follow the stories where they take me.

On a work day in horrible service area I use about 40% battery power over 9 hours. The next 6-7 hours at home .2 miles from tower I use another 10%, unless I play a game for a couple hours on phone, then Ill have 20% left when I start charging it.

On days off in my neighborhood, I will have 60% left when I go to bed at night.

For my free accessory from Nokia/At&t I chose the Mophie 4,000mAh 2.1A back up battery. I haven't used it once due to need, just to cycle juice through it to keep it fresh. This phones battery life is so far been outstanding.
[Nokia Lumia 900] alodar1:
I think there are indeed good results from the battery life on the 900. There are some people getting questionable battery life. I will always wonder about the configuration of those devices.

Personally I am aware of what is running on my device, but, generally, I do not hold back on anything for the sole purpose of extending my battery life to multiple days. I always have a plug in near by, if needed. Though I turn off BT when not needed, its more for the interference of other BT devices in the office than to save battery. Many times I've forgotten to turn it off and gone days with it on....and not noticed any drastic impact on my battery.

The only real significant battery drain I have noticed is when I play games with lots of ads. My battery will drain very fast. Much faster then even streaming music. I read a couple of articles online about battery drain and ads in free games and apps that say this is true and battery drain can be increased by the 30% range.

Even still, I have never come close to draining this battery. Though I don't have 44 tiles, I do use live tiles for those things I want live info from. I basically treat my phone as a convienence, and I indulge as necessary. :)

If your phone...your as in the general populate not you seed, have a battery issue, then consider hard reseting your phone, if you have never done it, or, open a ticket on it. There can be some bad batteries out there....
[Nokia Lumia 900] ragingclue:
Pretty sure the Micro Cell is what eats my battery the most. I get horrendous drain at home, and long battery life elsewhere. I wonder what the issue is. I wouldn't think the Micro Cell would be that bad considering I'm using WiFi for all the data. I get almost zero calls while at home too.
[Nokia Lumia 900] alodar1:
good point...or good question rather.
[Nokia Lumia 900] flooty333:
I am not seeing good battery life at all. Def not enough to get through a day.

Since I'm new to WP7 Ive been installing a lot of trial apps and uninstalling stuff I dont like.

I'm noticing 2 main drains so far:

- location based apps, including camera (I just shut off location for camera in settings)

- when I'm in the subway and there's no reception the battery drain in Diagnostics jumps

Should I do a hard reset now that I know more or less the apps that I'll be keeping?
[Nokia Lumia 900] bbtm:
After a hard reset I loaded only Nokia (Drive, maps, transit, creative studio) and Microsoft (Skype, Skydrive, MSN movies) apps and got great battery life despite being connected to a microcell for most of the day. The battery drain was about the same with or without the microcell - about 100mA. Then I loaded OneBusAway (Seattle bus locator) and the drain was consitently between 450 and 500mA even when the app was not running. I uninstalled the app and did a soft reset and the battery drain went back to around 100. Clearly some apps behave badly not only while they're running but also after termination. Maybe Microsoft has to fix the way the OS handles applications that don't terminate correctly. That's one area where the iPhone seems to be doing a better job.
[Nokia Lumia 900] alodar1:
Choice to do a hard reset is always yours. For me....why continue to use the original setup....to make a point?? If you use skydrive for pics and docs, all you lose is text messages. To restore apps you KNOW you want again, use Reinstaller. Not the greatest, but better than nothing.

For me, the ability to start over clean far outweights the principle of a hard resset. In fact...I just did one to test a skydrive problem :o
[Nokia Lumia 900] ragingclue:
I've been sitting here at 350-400mA playing with apps to try to find a rogue, and no luck. Then, as soon as I turned off cellular data (WiFi still on), back down to 100mA.

It's the MicroCell in my case for sure. I can repeat the behavior reliably. Wish I had some sort of wireless capture device to generate a pcap, maybe if I traced off the wire of the MicroCell? Then again I don't know if that would show anything.

But there's definitely a problem with battery drain on this phone when using the MicroCell, even if you are using WiFi for data.
[Nokia Lumia 900] hx4700 Killer:
Interesting. I have about 80 installed apps. some gps, LOTS of games, the new translator app from MS, skype, skydrive... I upload photos automatically, location services are on and the diag app I show 85 to 111mA

I then connected to my home WiFi and it kicked up to 388 to 405 for a few seconds then dropped back down to low 100's for at least 30 seconds before I shut it off.

I wonder if the higher consumption for you is due to actual dataflow.
[Nokia Lumia 900] ragingclue:
No it's absolutely the cellular data connection over the MicroCell. I've gone through all the combinations of stuff on and off, and I monitor or for a few solid minutes each time.

No matter whether the WiFi is on or off, MicroCell data connection puts the current draw around 400mA When it's off, I sit at a steady 100mA.

It might be a problem on the phone side, maybe on the MicroCell side, I don't know. What I do know is that the combination of the two eats the battery up.
[Nokia Lumia 900] Seed 2.0:
I don't think you "need" to hard reset. I just turned location off, and turn off all active background task, but selected them to use background task on next start up. My battery is discharging at a very VERY constant 84mA.

Now I just reactivated location and opened all 7 active task putting them back to a active background state. My battery is now draining very VERY constant 87mA but it took it about 90 seconds to back down from ~400mA before it stabilized.

HSPA+ (Full Bars), WiFi, Location Services on, 7 Active Tasks on; all that and still draining under 90mA. That is very impressive to me. I found that using battery saver during work ads a ton of usage time. My work signal is lucky to get 1 bar inside.
[Nokia Lumia 900] alodar1:
Maybe I missed something. Have you tested it away from the Microcell....
[Nokia Lumia 900] ragingclue:
Yup, sure have.

On LTE with cellular data on right now, and it's drawing ~95-122mA.

I'll have to read up a minute on the MC to see if it automatically updates firmware and if not, I'll need to make sure I have the latest.

EDIT: After reading up on it, the MC does check for software updates every time it's powered on. It's been about two weeks since I power cycled it, probably more recently since my wife did. Anyway, that's probably not the issue, but I did find a very interesting thread in the AT$T MicroCell subforum. Here is a link to that thread. It explains exactly what issue I'm having, and it seems to be rampant across all manufacturers and mobile OSes.

Post #27, by user ds.yellowfin seems to indicate it may be a recent change to the Cell software that introduced the issue (there's more to his/her post, but I only pulled the summary of it):

Then, the last post by rwilkins (post #44) seems to be a bit more informative, I can't really speak to its accuracy because my knowledge base is too narrow in this case:

Sounds like it could be this, but most definitely there's an issue with the MC draining everybody's batteries. A very widespread and infuriating issue.

But... then again... do I expect any better out of AT$T? Unfortunately at this point I'd have to say emphatically: HELL NO. Take a look at all the titles of the threads in the MC subforum. The battery drain issue isn't just widespread, but apparently it's been around and ignored for a while by AT$T.
[Nokia Lumia 900] bbtm:
I wonder if there is something wrong with your microcell. Mine doesn't seem to have an impact on battery drain.

I took the phone off the charger this morning and had a 1 hour phone call via the microcell. During the call the drain on the battery stabilized around 300mA and after the call it went back down to 95. After the call the battery was at 89%.
[Nokia Lumia 900] ragingclue:
I wonder that too. And it was a very real possibility to me until it became apparent just how widespread the issue is. I don't believe a simple defect could cause this scope of failures; it would have to be an entire bad batch (a GIANT batch), change in HW revision or FW revision (although pretty sure we're all on the same version of the FW/software). My device is no anomaly, I'm very sure of that based on the sheer volume of complaints on that forum. Imagine how many others either haven't pegged their drain on the MC, or aren't aware of it....

The one thing I do gather from all of it is that AT$T is aware but pretends they aren't, and then in the end they don't give a **** anyway. Typical.

EDIT: Anyway, I guess the relevance of all this is that it is NOT a problem originating specifically with the Lumia 900. It's reported across many OSes and manufacturers, with the only common factor being the MicroCells themselves. Exactly what that problem is remains to be seen, but at least we can take some of the battery drain issues off of Nokia's table.
[Nokia Lumia 900] dtjohnst:
I'm wondering if I should contact Rogers to ask about RMA'ing mine. As a test, I turned off wifi and bluetooth, I don't have any of the battery-draining "find my phone" services enabled. So...GPS only. I have 1 exchange, 1 Live and 1 GMail account all set for push-email/calendar/contacts and 1 pop3 account set for every hour.

If I make no phone calls, don't use the browser and don't play any games, meaning the phone's screen is only turned on for about 15 minutes total, I get about 8 hours of battery life. I mean literally. That's plugged in to a charger for 8 hours while I sleep, then fully shut off and unwilling to boot without being plugged in 8 a mere hours later. That seems to be horrid compared to what most people here are getting. Or am I just misreading what others are saying and my battery life is normal?

EDIT: I just another test: turned off everything (wifi, BT, location services, data), and set brightness to low, and my current shows 95-200mA drain. Turn on just data, 380-520mA drain. That seems to be really high.
[Nokia Lumia 900] jimski:
That is really high. With 4 email syncs (2 push, 1@30min/1@60min, 6 background tasks, Location on, find my phone on, WiFi-BT off, and Data on, I burned through 35% of my battery at work today (10 hours) checking my phone for Emil a few times and reading/replying to a few tasks.

With almost nothing on you should burn about 1% battery/hour while asleep. With a crapload on, maybe 4 to 5%/hour while asleep. So in 8 hours, anything more than 35-40% drain is a problem.

Sent from my Lumia 900 using Board Express