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iPhone 4S: Notifications, Location Services, the bane of good battery life

By | October 20, 2011, 5:04am PDT

Summary: New iPhone 4S owners are complaining about battery life on the new phone. The new notification system can cause the phone to constantly poll the network, if left to its default configuration.

The new notification system in iOS 5 is a welcome upgrade to the old-school method used by earlier versions. The system is so slick it entices new iPhone 4S owners to let every app on the phone send notifications for virtually every event the app tracks. Unfortunately, as Android phone owners can attest enabling notifications can be the quickest path to the shortest battery life on a new phone.

User forums are already rife with iPhone 4S owners complaining of poor battery life that is shorter than that of earlier iPhones. New owners are already discovering that apps that poll the web frequently for updates of one type or another can quickly drain the phone’s battery when outside the comfort of a Wi-Fi hotspot.

Those who have owned smartphones for a while know all too well that battery technology is not as good as it needs to be. Many a user has put a phone into standby mode at night, only to discover the phone battery was almost dead in the morning with no activity.

The problem lies in the fact that for today’s smartphone there is no such thing as no activity. Apps are designed to keep in touch with the web, often in the background, to keep the phone user informed of things even when not using the app. Social network apps, Twitter, Facebook, etc., are notorious for constantly polling the web to see if new updates from friends have been submitted. The result is the phone is always checking for them, and that means a hit on the battery.

So what can you do to make your battery last longer? Turn off location-based services, as those are used by many apps to check the network to see where the phone is all the time. Only turn on notifications for apps that are important to you, as that will limit the background polling going on all the time.

The notifications in iOS 5 are easy to access in settings, and the user can turn them off for each app as desired. Some apps place this setting in the app itself, so if an app is sending unneeded notifications check around to find the setting to disable them.

As the settings in iOS 5 makes clear: “Location Services uses GPS along with crowd-sourced Wi-Fi hotspot and cell tower locations to determine your approximate location.” That’s a lot of radio activity, and that eats a battery faster than anything. You can turn locations services off on an app-by-app basis in the iPhone settings to make sure critical apps can use them but nothing else.

The iPhone 4S battery life is pretty good in my experience, but I did turn off notifications I don’t need. I also disabled location services for apps that don’t need to know exactly where I am, like Twitter. There are other things you can do to spare your battery even further, but these two areas do it for me.

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James Kendrick has been using mobile devices since they weighed 30 pounds, and has been sharing his insights on mobile technology for almost that long.

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James Kendrick

James Kendrick has no affiliations or relationships that need to be disclosed.

Biography

James Kendrick

James Kendrick has been using mobile devices since they weighed 30 pounds, and has been sharing his insights on mobile technology for almost that long. Prior to joining ZDNet, James was the Founding Editor of jkOnTheRun, a CNET Top 100 Tech Blog that was acquired by GigaOM in 2008 and is now part of that prestigious tech network. James' writing has appeared in many print publications: Smartphone and Pocket PC Magazine, Information Week and Laptop Magazine to name a few. James' coverage of the mobile technology sector has regularly appeared in the New York Times, Salon.com and CNN/ Fortune online. Not just a writer, James has filmed numerous video reviews and how-tos that have garnered well over a million viewers. He has appeared on local news segments and been interviewed by the Associated Press on mobile technology topics. Additionally, James has been podcasting about mobile technology for years.

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Ah yes, battery life vs staying connected. Blackberry users now this too well. It would be nice to be able to control how often email and other services can open the cellphone radioway. The iPhone could probably use a timer instead of just an On/Off slider.
0 Votes
+ -
A conundrum
root12 20th Oct
Some don't need to be on when you are not using it. An example from the screenshot above: Speed Test does not need to have location based services on when are not using it. Can the app be designed to have it on only when the app is active? Or maybe an option to have the user to have it enabled when the app is active and it will automatically turn off when not. Yea, a switch saying 'on' when app is active or something.
@root12 It will not use it if it isn't active... Speed Test will query for a location either when launched or when the test is run but it does not just sit there asking, "where am I?"
@root12

Yea android does that. GPS enabled doesn't activate till an app requires it.
@westvolusiaguys see, the problem is, nobody cares until it makes it revolutionary way on iPhone.
Yep, just one more place that Google didn't cut corners and now many Android Phones are better prepared to deal with this.

I get roughly 14 hours before my battery indicator turns red on my Droid X2 using default settings. My phone can pretty much do everything the iPhone 4s can do and then some (I have VLingo so I can do anything Siri can do pretty much) without worrying about this stuff.

If my battery weren't enough, I could go ahead and get the 3500phone Mah extended battery.

Oh and iPhone 4s users? Shut off the stock ticker then scale back the weather App and you will see improvements... also, limit what you're sending to cloud and that will also help.
Oh and one more thing, I stated at the beginning of the year that Apple was cheating to get the battery life they got and with iOS 5 it is becoming obvious.

And yes it is an iOS 5 thing as the iPhone 4 I was using had the battery life change dramatically when the update happened.
@Peter Perry You should really stop. First Vlingo does nto even compare to Siri. Second most here dont take you seriouse anyways because of your blind hatred to apple anywas. Really dude give it up already. YOU should really stop posting here and go play over at engadget.
ROFL you probably just downloaded Vlingo now after Siri came out and some people posted it on forums saying it competes. Now you going to come here and act as if you had it all along and say its the same as Siri. Man you are way to dense and this hatred of yours is down right scary. I think you need to get help.
@illwill112. Umm, you cannot refute so you insult.

Thia post doesn't have anything to do with Hatred towards Apple, I don't hate them... I use a MacBook Air, before that it was a MacBook Pro and then a Mac Mini... I also recently bought an iPad 2 for an iCade setup.

As for VLingo, nope had that for some time and you're right, it actually works everytime! But as for use, I use the car mode and it works 100% for my needs. It has probably 80% of the features of Siri but is further along in those areas.
@Peter Perry I have noticed a battery life change on my 4 since the update but I am pretty sure that for the most part I have been using the phone more since then and I still get at least double your 14 hours before I charge when I get to 30% or 40% battery left.
@Peter Perry
14 hours? thats all? ouch.. and I thought my 4S was bad...
@doh123 that is with Heavy Use, everything turned on and when the red light indicator hits I have 30% remaining. What this means is I am good for 20 hours of heavy use in any given day.

Your iPhone with everything turned on will not touch that because the iPhone 4 I was using couldn't come close when running iOS 5 and that's reality.
@Peter Perry You seem like such an authority on the iPhone with you spouting about how amazing Android is. I like Android, too, but it doesn't mean I don't gawk at the iPhone. I'd prefer my rock-solid stability on my iPhone 4S over some fragmented OS that comes different on each phone that is launched (and it seems like a new one each week - hmmm). The reality is that you can't cope with the massive influx of Android devices that brings the quality of the OS to a shoddy state on most devices, and fairly functional on the rest. The only "good" Android phone I've seen is the Droid Bionic, and it's smooth as butter.

Sorry to feed the trolls, ZDNet, but this guy burnt my biscuits with his incessant Apple bashing and trollmongering.
@TSH4Life@... Okay I am game, name one of these phones you have used which has major issues with Fragmentation and Application Compatibility...

As for the iPhone, sorry man just speaking the truth but clearly you're upset because their was some basis on fact to what I have said.

I am sorry if this upsets you guys but unlike most bloggers here I don't believe they should get a free pass.

The phone has benefits and I never denied that but their approach to managing the battery in the past wasn't designed for this type of notification structure and now it is coming back on them.


When I shut all the notifications, stock ticker app, limited the sending of Data to the Cloud and what is being sent I got to where I was using between 50 and 60% of the battery through 12 hours...

With all that stuff on the phone was almost dead within 6 to 8 hours.
@Peter Perry Your iPhone with everything turned on will not touch that because the iPhone 4 I was using couldn't come close when running iOS 5 and that's reality.
No, that's your reality but not mine.
@Peter Perry Is the default setting have the GPS turned on? I hear that is a major problem with some driods.
0 Votes
+ -
Not sure about Droids
rhonin 20th Oct
@SomeGuyNamedJay
But on the SGS2 it is and I have great battery life.

btw - I use my i4 as an iTouch and notice with stock settings it won't last a day of moderate use. I would have expected with no sim I would get much longer life.
I just turned off all the "stuff" and will see how it does...
@Peter Try disabling Siri for a day, extreme impact on battery life. Turn it back on and you can practically watch the battery meter go down sad
0 Votes
+ -
If only there was an OS that ...
daboochmeister 20th Oct
... allowed you to decide and control such app actions - for example, allowing you to configure all apps (or any particular app) to only be allowed to "phone home" for data via wifi when available, and not over a mobile connection.

Oh, that's right, they added that to Android in ICS happy

Seriously, good feature, which i would think iOS and WP7 will pick up. (or do they already have it in some fashion, anyone?)
@daboochmeister Yes, some apps do have this feature in iOS but it tends to be apps that have a heavy load when "syncing" such as things like Dropbox and Photo transfer apps. Some only allow you transfer data over wifi but as of yet there is no global OS system settings.

Personally I do not have a problem with battery life because I do not have more than 15 apps loaded onto my phone. I limit even those that are installed as the author states, by turning off location services. I can still get over two days of battery life or more (usually charge at the 25% mark or 50% mark).

It's still a mobile computer people. Software will get more intelligent but it's also up to the App developers to better configure their software.
@deftdrummer
i am extremely impressed. I have yet to see a smart phone, who doesnt have almost all of its services nerfed (and then what is the point) get truly more than a full day out of it.

and i have used Bberry, Droid and iPhone. the old Bberry was the only one that i could get 2 days out of it without charging it at all.
In the Android world, with most phones you can carry a spare battery. Not so with the iPhone. Looks like the Droid Razr also doesn't have the ability to switch batteries. I think any trend away from replaceable batteries is a bad thing.
@chapelhillice
I have a portable battery that charges my iphone from 0 to full 4 times. I got for my ipod at first my international flights. I find it works great with the iphone4 and its small
@chapelhillice I feel not being able to swap out batteries is a good thing personally. It's just my personal opinion but I happen to like it. Less chance of disaster if the phone hits water, less chance of the back plate and battery breaking upon some kind of impact.

Think about it, if you drop your phone what is the first thing that happens upon impact 75% of the time? Back plate flies off, and the battery dislodges.
0 Votes
+ -
There's a downside
rhonin 20th Oct
@Bates_
Have a 3G the kids use as a Touch (actually 2).
Battery won't hold a charge for more than a few of hours now. I have to send it in to replace the battery instead of being able to just go get a new one.
@rhonin I think it's understandable that the 3G would need a battery at this point but what is the cost difference between just buying a replaceable battery (of equal quality) and having it replaced?
0 Votes
+ -
I want more and more things to run, but I want them to all run without using any of my battery.

Why can't they just run "magically" on nothing?
0 Votes
+ -
Hogwarts
rhonin 20th Oct
@CathyCC

Chuckle happy
I have an iOS 5 iPhone 4 and the battery life seems about the same, maybe even better. Notifications are on for almost everything as are location services.

If it is just the iPhone 4S having battery issues then that can't be the fault of iOS 5.
Same problem with all smartphones. Battery tech is not keeping up with the hardware.
0 Votes
+ -
Don't think so
rhonin 20th Oct
@rdw551
My SGS2 is great on my battery - comes with a great power management system......
0 Votes
+ -
Agreed
Solid Water 20th Oct
@rhonin
My SGS2 lasts 3 days in light use mode (on Sprint)
0 Votes
+ -
dsfhdfh
dyityibg 20th Oct
I get almost two days battery life out of my Samsung Focus with WiFi on and location services on permanently. It should be obvious that if you add dual core and notifications your battery life will decrease.
WP7 has two task types
Periodic (runs 15secs every 30 mins for lightweight tasks, pretty severe resource constraints)
Resource Intensive (only runs when wifi is on, might need to be plugged in too??)
This is a good balance for many apps
Is it really necessary to have all Apps turned on all the time or is it the grip of being left out paranoia? Turn all the crap off until you need it or is that too difficult?

Lithium battery technology today is miles ahead of previous NiCad-NimH so learn how to manage it. I agree with a previous poster, if the iPhone 4S is so magical why does even need a battery?

Every battery powered device has limits...deal with it.
Why do multiple apps get to request location individually - or did I read your description wrong ?
Seems deeply flawed if so.
0 Votes
+ -
And the good news is:
Userama 20th Oct
you can choose to turn all that stuff off!!!
On a side topic, it seems that you cannot talk and surf data or access email simultaneously on the sprint network. It seems like a real down turner.
0 Votes
+ -
Surprised?
rhonin 20th Oct
@jmamas
That's a limitation of CDMA.
Now if it had 4G.....

grin
@jmamas well... boo-hoo. I am sure it is expremely important. You forgot to add messaging and driving
0 Votes
+ -
My brand new 4S won't last 8 hrs
geoff_hazel@... 20th Oct
what I consider normal use: an hour a day on the phone on speaker, and some internet scrabble off and on all day. Fetch mail from my work and gmail. Two days now and I watch the battery drain right down from 100 to 20 over 7 hours. Pathetic. I had the Apple tech show me I had open apps yesterday and how to close them, I've been faithful about it but still just 7 hrs from 100 to 20%.
" The system is so slick it entices new iPhone 4S owners to let every app on the phone send notifications for virtually every event the app tracks. "

Keep in mind that iOS 5 is not just for 4s users - any user of a recent generation of iPhone and iPod touch benefits happy. It works fine on iPhone 4.

Also turn off radios you're not using. If you're not using Bluetooth, turn it off. If you're in range of WiFi, turn data off. If you're nowhere near WiFi, turn WiFi off.
0 Votes
+ -
Polling not involved
dogbreath1 Updated - 20th Oct
Sorry, iOS notifications don't use polling.

Battery life is good on my 4 and 4s with iOS5. I can go 2 days on batt with moderate use.
0 Votes
+ -
RE: Polling not involved
dogbreath1 Updated - 21st Oct
Location-based reminders (such as "remind me to ___ when I leave work") do seem to cause your GPS coordinates and/or wi-fi network to be polled periodically to determine your present location. This /does/ consume significant battery life. I don't know how frequently iOS polls, but I have the feeling the interval could be longer. It also might be made user-configurable. With a location-based reminder active, my 4S battery only lasts ~8 hours... and I'm notified quite promptly when I enter or leave a trigger location.

btw: killing background apps has little/no impact on battery life, unless they're actively streaming audio. Otherwise iOS automatically suspends basically all apps completely when they're put in the background. The only reason to kill a background app is to reset it, if it's gotten into a weird state. On rare occasion, it's necessary to delete and reinstall a wayward app.

There is a very real problem with the accuracy of Apple-related technical information reported/blogged on a PC-centric site like ZDnet.
The biggest hit on battery life I've found so far is Siri. I shut it off for a day and was back in the realm of iPhone 4-esque power levels at the end of the day.

One other thing I discovered... After using Siri for a few days to create & edit alarms; work with reminders and lists, and do calendar stuff -- it's very hard to leave it off for a full day...

The Siri privacy statement is a good read, you can tap to read it in the settings screen where you turn Siri off. Was surprised to see what all is sent to Apple's servers when you use it, and how much of that is retained on the servers -- including recordings of what you've said. Apparently, turning Siri off deletes your data, including contact relationships. If turned back on, Siri takes "a little while" to begin working while it re-initializes your info. Turning it back on after 24 hours of it being off, there was no delay -- the service worked instantly and my contact relationships were still there.
I did the suggested restore and bam! It's works great! I was getting about half way through the day with minimal usage. After the restore, I placed about an hour's worth of voice calls, several text messages and some net-based apps and I used only approximately 20% of the battery all day! So this is really good news. I hope this helps inspire everyone to do the same so they can get on with enjoying their new 4s! Also, I turned off that time sync that was mentioned and enabled push messages for just a few necessary apps.
hi, are notifications still on even when I close apps by clicking on home button then holding down an app, then clicking on the "close this app" red/white button? What does it really mean to "close" an app from a usage POV? thanks.
wow people grow up this is a forum for help and not for phone bashing.....we have 3 iPhone 4's and 1 iPhone 4s and all 4 phones have the same battery issue and we all have different services turned on and we also all use different apps!!
At Proxpro, we identified the battery drain issue from location-based notifications and developed future location prediction technology (patents pending) to reduce unnecessary battery drain. Iphone 4s demonstrates how we are at a new frontier of Location-based pushed notifications, battery drain needs a solution.
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