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iOS 4.0 Amazing battery life!

Loves2spoon

Loves2spoon

macrumors 65816
Original poster
Jun 3, 2010
1,081
34
California
I've had 4.0 GM installed since the day of the keynote now and the battery life is great!

I used my phone for 8 hours yesterday making calls, twitter, texting, craigslist and I woke up this morning and I still have 70% battery!

I have all the same settings I used on 3.1.3 and the battery lasts 10x longer. Since I have enabled multi-tasking and I can close apps with the double click on the 3G that's why it's lasting longer perhaps?
 
Loves2spoon said:
I've had 4.0 GM installed since the day of the keynote now and the battery life is great!

I used my phone for 8 hours yesterday making calls, twitter, texting, craigslist and I woke up this morning and I still have 70% battery!

I have all the same settings I used on 3.1.3 and the battery lasts 10x longer. Since I have enabled multi-tasking and I can close apps with the double click on the 3G that's why it's lasting longer perhaps?
Click to expand...

Jailbroken and beta/GM tend to have "off" battery readings. Restart your phone for an accurate reading. I had the same thing happen until I restarted. Beyond that, the OS probably improves battery life to some degree to compensate for multi-tasking.
 
i think most people have had worse battery life after going to 4.0. mine also seems a little worse.
 
I have somewhat worse battery life, but I suspect that is because WiFi connections are now persistent. The phone maintains its WiFi connection even when it is locked, rather than switching to cellular data only.
 
Mines a bit better.. Normally I go to bed with 35% and 4:30-5 hours of usage. Last night I had 47% remaining with 5:10 of usage. Just mostly texting, few emails and some web browsing.
 
thelatinist said:
I have somewhat worse battery life, but I suspect that is because WiFi connections are now persistent. The phone maintains its WiFi connection even when it is locked, rather than switching to cellular data only.
Click to expand...


Is this a bug or something that will be fixed before the iphone 4 is available?
 
thelatinist said:
No, I think this is one of the 100+ "features" of 4.0.
Click to expand...

Are you being sarcastic? I'm guessing you're not because I don't see any smiley faces but you never know:D. If the phone is staying on wifi instead of switching over to cellular data, wouldn't that improve battery life anyway?
 
psywzrd said:
Are you being sarcastic? I'm guessing you're not because I don't see any smiley faces but you never know:D. If the phone is staying on wifi instead of switching over to cellular data, wouldn't that improve battery life anyway?
Click to expand...

Not really, since you will be keeping two radios active, instead of just one.

I suspect this is a change in response to no more unlimited plans being available. Before, Apple could optimize for battery life by turning off the WiFi radio to save the battery, and be assured that the unlimited plan would be able to handle any data usage while the WiFi was off. That's no longer true, so for the sake of keeping people within their data plans, they keep WiFi active the whole time if there is a nearby known network.
 
remember guys, the multitasking is currently a battery hog until the apps that you have on your phone are optimized and updated using the new api's...

then you will see huge improvement in battery life from what you have now...

better than 3.1.3?..we shall see.....
 
vincebio said:
remember guys, the multitasking is currently a battery hog until the apps that you have on your phone are optimized and updated using the new api's...

then you will see huge improvement in battery life from what you have now...

better than 3.1.3?..we shall see.....
Click to expand...

How is this true? Since none of them are using the new APIs, none of them are running the background.
 
well, the tests that i did showed that when there was lots of the apps i was using in the multitasking dock, my battery life zipped down so much quicker than when i took them out...

what im saying is that when the apps im using are updated to work correctly with multitasking, we will see battery improvements...
 
vincebio said:
well, the tests that i did showed that when there was lots of the apps i was using in the multitasking dock, my battery life zipped down so much quicker than when i took them out...

what im saying is that when the apps im using are updated to work correctly with multitasking, we will see battery improvements...
Click to expand...

But just because they're in the dock doesn't mean they're active. It has your recently used apps in there as well. The APIs exist to allow those apps to continue using services of the phone (media for example in pandora) without being truly fully running. Without the app looking for that API, it'd just shut down as would be normal behavior.
 
vincebio said:
well, the tests that i did showed that when there was lots of the apps i was using in the multitasking dock, my battery life zipped down so much quicker than when i took them out...

what im saying is that when the apps im using are updated to work correctly with multitasking, we will see battery improvements...
Click to expand...

Well, something is wrong with your phone then because those apps aren't running in the background so there's no way they're responsible for the battery usage. Something else happened to your phone.
 
chrmjenkins said:
How is this true? Since none of them are using the new APIs, none of them are running the background.
Click to expand...

Not even first party apps like "Settings"? (I don't have iOS 4.0, I just remember that Settings now is supposed to start from where you left it, like in a sub-menu)
 
gianly1985 said:
Not even first party apps like "Settings"? (I don't have iOS 4.0, I just remember that Settings now is supposed to start from where you left it, like in a sub-menu)
Click to expand...

That may be the source, but what's he suggesting is that that will change once iOS 4 officially launches. It won't as those are first party apps and are already coded to use the APIs.
 
chrmjenkins said:
That may be the source, but what's he suggesting is that that will change once iOS 4 officially launches. It won't as those are first party apps and are already coded to use the APIs.
Click to expand...

Yeah yeah I know, he WAS wrong (3rd party apps at the moment are not using the multitasking feature AT ALL, they're not "a hog"), your answer was totally appropriate, I was just pointing out that first party apps like Settings may already be running in background.
 
vincebio said:
what im saying is that when the apps im using are updated to work correctly with multitasking, we will see battery improvements...
Click to expand...

Actually, the exact opposite. Once apps take advantage of the API's, then we'll have decreased battery life. Right now, when you close out of an app, it's done using resources. (until iOS4 specific apps are released)
 
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