iPhone 12 battery draining fast

Even for your friend, loosing 5% during night is a moderate drain but is still not normal...

With a similar configuration, except I had dual SIM, on a 11 Pro Max I remained at 100% or exceptionally at 99% during a night in idle.

With my 12 Pro Max I loose 20% ...

I have background app refresh turned off.

there is an issue with built in apps (messages, phone, photos) either super draining or ignoring it.

ALSO - as reported with 14.2, optimized battery charging kept turning back on.

in 14.3, my wireless charger indicates (via unique color) that my phone is no longer charging in the middle of the night, even though I have optimized turned off.

... which may be inaccurate, since is the exact behavior if it is turned on.

... and explains a 30-35% drop in battery.

iPhone 12, 256GB

I have updated to iOS 14.3 yesterday at noon and I immediately switched to DSDS mode to test it out, it has been short of a day until now and it seems to me that the abnormally fast battery drain I experienced on DSDS mode has been greatly reduced (fingers crossed). Last night my phone lost 5 percent during the span of 7.5 idle hours. I used to lose 20-30 percent during the same period of time on idle. Frankly speaking, I still think the battery drain is a bit higher than it should be. I’ll give it a few more days to conduct more tests.

Ok so it's been more than 24 hours since I updated to 14.3 and I observed that the first 20-24 hours from full charge, the battery standby is great but once it starts to drain or once I started using the phone, the fast battery drain came back. So apparently, it hasn't been fixed.

Hi, i am not facing any overnight battery drain, but yes loose a good amount of battery with light usage. Are you facing an issue with high battery drain only on standby or even while using it. I am just asking for the sole purpose of whether should I update to 14.3 or does it make the phone even worse.

Exactly, old iphones never lost battery battery like what the 12 series is. I’m lucky that I’m not losing much battery on standby but like its just more than normal with usage. Battery drain is pretty inconsistent is what i have to say. I play a game for 10-15 minutes and lose no battery but just a couple of minutes of browsing losing like 2%. I’m pretty sure this is not normal. I really hope that apple has some fix for this problem soon. Even ios 14.3 hasn’t fixed this problem

I experience the same thing but I think to know why.

This can probably be explained by the fact that as they are new or almost new, the battery capacity is often higher than the design capacity and therefore, the max battery capacity is higher than 100%. There should be a software limitation to not display at state of charge higher than 100%..

For exemple, according to coconut battery, mine has 200 mAh (approx 5% on a 12 pro max) more that the design capacity, so fully loaded it is virtually at 105% even if iOS shows only 100%.

The drain from 105 to 100 is invisible, but exists, and then from 99% the drain start to be visible.

Oh I didn’t realize that updating to iOS 14.3 automatically turned 5G auto mode on and there’s no 5G here. That explains the battery drain. Now I opted to LTE. Fingers crossed, this will make everything ok.

So

Wake up with 98%...one hour later i arrived at work:

ONE hour

20 minutes screen on time

Lost 15% battery

This is inadmissible, Apple being saying this is NORMAL behavior...i don´t see this behavior, not even close on my iPhone 11.

Put this on your minds, this is not a carrier problem and you should not be messing with settings just to get it working “better”

This is a phone problem...hardware or software.

Keep going to Apple stores and filling the Apple feedback form.

Put this on your minds, this is not a carrier problem and you should not be messing with settings just to get it working “better”

helder33 wrote:

Put this on your minds, this is not a carrier problem and you should not be messing with settings just to get it working “better”

This is a phone problem...hardware or software.

This is it as I said previously, people are trying to reduce their use and adapt their settings to improve the battery endurance and to get something more or less close to what they had with their previous iPhone.

And they even get happy when its improves, even if being still worst that an iPhone which was at least 1 year old...

But it is a shame to have to do so with a brand new phone when you haven't change your use nor your settings!

Don't say "it is better than yesterday", even if it is, when it is much worst than with an iPhone 11, or older, guys! Please...

As if you car was sold for 45 MPG, you got only 15 initially and finally 20 after service. Ok it is better but it is still much lower than what could and should be expected ;)

Selzere wrote:

As if you car was sold for 45 MPG, you got only 15 initially and finally 20 after service. Ok it is better but it is still much lower than what could and should be expected ;)

That's actually a horrible example, as MPG ratings for cars are under very carefully controlled conditions that have nothing to do with actual driving.

You shouldn't have to change your settings, but the carriers definitely do.

If everybody is an iPhone user...you just have to do a simple thing, compare it to previous models that you owned...

Did you have to mess with settings to have your device working properly? NO

Did you, every morning or during the day, have to check your battery? NO

Is this issue normal ? NO

It’s not ok to say that as been an improvement and it is a little better, and it is good for you.

This is not ok for me and should not be to everyone here...the most important thing is to Apple acknowledge this problem, and that only happen with “noise” and not saying “it’s better”.

KEEP WRITING ON APPLE SUPPORT PAGE...OR GOING TO APPLE STORES

helder33 wrote:

This is not ok for me and should not be to everyone here...the most important thing is to Apple acknowledge this problem, and that only happen with “noise” and not saying “it’s better”.

KEEP WRITING ON APPLE SUPPORT PAGE...OR GOING TO APPLE STORES

I have already submitted 3 complains on the feedback form, but never get any answer ...

I have contact Apple Support once, and as everyone I was told than my phone and its battery is doing just fine and that I have to switch off background app activity, kill them before night and maybe deactivate my watch background updates... Great! Thank you Apple ...

I didn't get a clear answer when I asked why I hadn't made it on any of previous iPhone ever and didn't face such issue ...

William Kucharski wrote:

That's actually a horrible example, as MPG ratings for cars are under very carefully controlled conditions that have nothing to do with actual driving.

Indeed, your are right haha! But I am sure you get the idea ;)

Ok. Now let me explain my condition in detail and let me tell you why this problem is not what everyone thinks.

I bought an iPhone 12 pro in india.

Paid 120K ($1650) worth of indian currency for the device.

I only use one physical sim (no e sim used) by AirTel India.

I don’t use my mobile data. Only my household wifi.

Before 14.2, i used to charge at 36 hours intervals on normal usage.

Updated to 14.2 and saw an overnight drain of 20%

Read in this very forum somewhere factory reset my device, nothing happened.

Calibrated my battery by discharging to 0 then charging for 6 hours straight, nothing happened.

Turned off wifi, bluetooth and notification. Turned on dark mode and low power mode, flight mode etc etc. Still drained 15% overnight.

Turned off the background refresh of all apps, still nothing.

Updated to 14.3, carrier update arrived and still 9% drain overnight yesterday.

The saddest and most annoying part is that when i contacted the apple support, they behaving as if they are hearing this issue for the first time and suggesting turning off background refresh and all sort of things.

Filled the feedback on apple support and waiting for some help to arrive.

Trust me I’ve tried everything and nothing has worked yet. Don’t go through all the trouble of resetting and experimenting with different settings. Cause I’ve been through all that. And this is my first apple device ever.