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Why stop at 10.3.3? I ran iOS 11 on my SE and was a fantastic update. Solved the battery drain issue I was having under iOS 10.
no drain issues here. In fact perfect battery performance on 10.3.3. iOS 11 was ****** anyways.
 
I checked my battery stats today, and 8 days after upgrading there was a very interesting curve on the graph showing charge vs. use. The day I upgraded the battery use the graph spiked and every day since has steadily descended, regardless of my activity. So it would seem that there’s a fair amount of background process happening after an update which may account for my significant battery drain. It now appears to have normalized and battery drain appears to be similar to that I experienced prior to the update. I’ll keep an eye on it, but it would seem iOS 12 is turning out to be a great update.
 
How do you calibrate the battery?
Is it drain to 0% let it die and then fully charge?? I’ve read that since iOS 1 but not sure that will do it. But maybe that is it. Curious

I suggest you to calibrate the battery.
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Not the case for me. Battery health 100% (4 months old phone), and I don't see differences between iOS 11 and 12. I've installed it exactly when it was released (via iTunes - phone set as new), so it had time to settle, and now I am very happy. Maybe iOS 10.3.3 is a little better in battery terms, I couldn't know because when I bought the phone it came with 11.4
 
I see even iPhone X owners complaining about battery life after upgrading to iOS 12. After taking a look at the battery stats from these users, we can see a lot of background activity from Facebook, Whatsapp, and so on. Although I think Whatsapp needs background execution for "Whatsapp Web" functioning, I doubt someone needs Facebook background activity. In short: turn off the most possible (if possible all) background activity. I also turn off transparency and turn on "reduce motion" at accessibility options. If you're brave enough, turn off most notifications you can, but I doubt this will present too much difference, since I presume iOS concentrates notification fetching into a single service (which runs in background), but in this case it doesn't matter too much if it fetches one or a dozen of notifications.

Gimmicks will always eat more battery than not using them, doesn't matter how much efficient is your CPU/GPU.
 
I see even iPhone X owners complaining about battery life after upgrading to iOS 12. After taking a look at the battery stats from these users, we can see a lot of background activity from Facebook, Whatsapp, and so on. Although I think Whatsapp needs background execution for "Whatsapp Web" functioning, I doubt someone needs Facebook background activity. In short: turn off the most possible (if possible all) background activity. I also turn off transparency and turn on "reduce motion" at accessibility options. If you're brave enough, turn off most notifications you can, but I doubt this will present too much difference, since I presume iOS concentrates notification fetching into a single service (which runs in background), but in this case it doesn't matter too much if it fetches one or a dozen of notifications.

Gimmicks will always eat more battery than not using them, doesn't matter how much efficient is your CPU/GPU.

I have no social media apps installed and almost no background activity for the apps I do have. Nothing has changed in my settings since iOS 11, which clearly points to their being something in iOS 12 causing my battery drain issue. The same can be said for anyone else - if they didn’t change anything from 11 to 12, obviously the problem is iOS 12.
 
I see even iPhone X owners complaining about battery life after upgrading to iOS 12. After taking a look at the battery stats from these users, we can see a lot of background activity from Facebook, Whatsapp, and so on. Although I think Whatsapp needs background execution for "Whatsapp Web" functioning, I doubt someone needs Facebook background activity. In short: turn off the most possible (if possible all) background activity. I also turn off transparency and turn on "reduce motion" at accessibility options. If you're brave enough, turn off most notifications you can, but I doubt this will present too much difference, since I presume iOS concentrates notification fetching into a single service (which runs in background), but in this case it doesn't matter too much if it fetches one or a dozen of notifications.

Gimmicks will always eat more battery than not using them, doesn't matter how much efficient is your CPU/GPU.
This.

Background refresh here is disabled for all apps, among other thing that helped:
https://forums.macrumors.com/threads/ios12-battery-drain.2143316/#post-26582766

I was right, it's possible to track where the problem is. Almost no one doing a clean install and lots of c.rap settings that reduce the battery considerably.
 
This is not good news with my SE on iOS12. Had an unexpected shutdown today with a message saying that the phone was trying to draw more power than what was available. The SE is only 10 months old with a battery capacity of 100% so this shouldn't be happening. As mentioned before in this post I've had no end of problems since the iOS 12 update.

Warranty claim I think.
 

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Actually what I said is in fact what I said originally (without any suggestions or discounting of anything one way or another):
You, on the other hand, in fact, said something somewhat different originally:

Huh? like what?

There seems to be more and more people complaining about iOS12 battery life, not just SE...this is not worth the risk.
 
Okay, after all your initial impressions, I've made a choice. I'm staying on iOS 10.2
My phone is almost 2 years old, the battery probably is at 80-85% of its original capacity, and still, it lasts 7-8h of screen time.

So I'm not wasting my SE. I didn't update to iOS 11 and I won't update to iOS 12. I'll miss Airport 2, it's one of the features I will miss the most, but for now I prefer to have a rock solid working smartphone with good battery life.

The only thing I could do to jump into iOS is Apple releasing an updated SE or an SE sized iPhone Xs/Xr. Otherwise, I'll stay on iOS 10.2, the version previous to the shutdows and slowdowns and battery gate for Apple (iOS 10.2.1)
 
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Okay, after all your initial impressions, I've made a choice. I'm staying on iOS 10.2
My phone is almost 2 years old, the battery probably is at 80-85% of its original capacity, and still, it lasts 7-8h of screen time.

So I'm not wasting my SE. I didn't update to iOS 11 and I won't update to iOS 12. I'll miss Airport 2, it's one of the features I will miss the most, but for now I prefer to have a rock solid working smartphone with good battery life.

The only thing I could do to jump into iOS is Apple releasing an updated SE or an SE sized iPhone Xs/Xr. Otherwise, I'll stay on iOS 10.2, the version previous to the shutdows and slowdowns and battery gate for Apple (iOS 10.2.1)

Whatever OS you run, you really should make an appointment to get your SE battery replaced before the end of the year while Apple is offering it for $29. Best thing you could do to restore optimal function to your phone.

I’m doing that soon. Lucky for me, iOS 12 has finally settled down, and battery life has returned to its normal power draw.
 
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Not sure how that relates to what I said.
You believe if terrible battery life didn’t happen to every single one of SE users then it’s recommendable to anyone to update.

Whereas I believe if it happens to me then it’s recommendable to think long and hard on why you want to update.

But I am sure that’s too much for you to comprehend.
 
You believe if terrible battery life didn’t happen to every single one of SE users then it’s recommendable to anyone to update.

Whereas I believe if it happens to me then it’s recommendable to think long and hard on why you want to update.

But I am sure that’s too much for you to comprehend.
Not sure where you are coming up with something of your own as to what I supposedly believe, given that I actually clarified what I said and specifically pointed it all out too. It seems like comprehension issues have been and continue to be elsewhere. Given that, seems like it's best to avoid going in circles over and over again.
 
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Considering feedback from various others seems like it's not as simple as just some anecdotal experiences.

Speaking from own experience is premature because if it didn’t happen to every single se users then it’s just my experience.
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Not sure where you are coming up with something as to what I supposedly believe, given that I actually clarified what I said and specifically pointed it all out too. It seems like comprehension issues have been and continue to be elsewhere. Given that, seems like it's best to avoid going in circles over and over again.
Proven my point exactly. Too much for you to comprehend.
 
Speaking from own experience is premature because if it didn’t happen to every single se users then it’s just my experience.
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Proven my point exactly. Too much for you to comprehend.
Indeed, a point has certainly been proven.
 
I've had great experience with iOS 11 on my SE. I always do a clean install on a phone when I take the iOS up, so I don't have to wonder about any old 3rd party app settings and a new operating system. It gives me a chance to rethink and declutter app choices, too.

Going to wait a little bit longer on the SE's 12 install but I'm looking forward to the upgrade, meanwhile I will stick iOS 12 on an iPad mini 2 and get used to the features.

I don't ask a lot of that mini 2, so it doesn't bother me that that particular piece of my gear is the oldest one of the iPad mini models that can run iOS 12. I'm not looking for any performance benchmarks from it, just a playground for making my way around the new iOS. That way after I get used to 12 and maybe see a bug fix out, I'll be more comfortable about upgrading my SE.
 
The only reason im considirng upgrade to iOS12 from 10.3.3 is for the new option to use 3rd party apps with Apple CarPlay. Till i'll make my mind, i will wait a bit longer while more beta users test it first. ;)
 
I wanted to ask you guys what did you exactly do to preserve more battery at your IPhone SE (and not only SE, generally) after ios 12 update.
I got the feeling that although my phone is faster, the battery is draining quicker. Does this make any sense in your opinion? I have automatic brightness, location on when i use some apps, messenger, facebook,instagram, im taking some pics every day etc, and my battery can barely make it until the night. Since 7am i've been using my phone and now at 13.18 the battery life is 50% ! (although i have to admit a played poker a little bit with my phone).
But still what are you doing/what can you do to spare battery life?
 
I'm having the exact same battery issues as the others. Had my SE just over a year and had my first unexpected shutdown with 13% remaining. Battery still has 91% original capacity. Overall the phone runs silky smooth, but I'm definitely not getting 3 days of battery life anymore. Debating on paying $29 for the new battery...
 
Apple replaced my SE due to battery problems. So far the replacement on iOS 12 is behaving fine and since 8am to 9pm lost 20% from fully charged.

My original SE, 10 months old, 100% health and 90 cycles had issues upon installing iOS 12, specifically fast % countdowns and upon hitting the 20% mark unexpected shutdowns.

Fingers crossed it continues to be ok
 
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