iPhone 12 battery draining fast

Hey man, i too bought an iphone 12 pro and have the faced the exact same situation. My case too was escalated to the engineering department and they said the phone is alright. About the standby drain you are completely right. I too face 5-10% drain if its not 100%. Apple just collected data for me but at the end it was all pointless. Please do let us know what do they have to say. Thank you

So I too can vouch for the idle drain being 0% when unplugged at 100%. Additionally, it is the same at any other percentage as well. What I mean by this is, even if I unplug my iPhone 12 at around 80% irrespective of day or night, it stays at 80% even for as long as 5-6 hrs idling with 0% drain, sometimes even for a longer duration. This is with WiFi on, BAR turned off and dual SIM active. I have also seen this when I unplug my iPhone just before going to sleep (again at around 80%) and it doesn’t drain a single percent. But if I have let’s say used it for a while and it has drained a percent, it will see an idle drain of 4-5% with everything turned off except both my SIM cards being active. I’m wondering if this is not normal? I mean don’t iPhones drain even a single percent while idling during night? I’m confused here, coming from android I thought this is normal.

Iphones shouldn’t generally drain a single percent overnight whether just unplugged from the charger or even used before sleeping. The iphone 11’s would never drain overnight mo matter what the circumstances are. Even if there was some background activity a maximum of 2-3% should drain. More than that is just not normal.

Interesting observation, someone posted that as long as they charge a little before going to sleep and unplugged the iPhone, it does not drain over night . So I charged to 94 percent , unplugged , and no drain overnight yet another time I just went to sleep with 90percent and woke up 85. There is constant a five percent drain overnight n an overall slow drain with no usage over the day. I postulate this proves that there is an internal clock with the battery that tiggers drain when it is “live” and this is why iPhone 12 have horrible battery live. Please someone working for Apple who reads these forum test it out. This supports why there is such a big difference of iPhone 11 and 12 n not only battery size.

Apple during their events, always mention that this year’s Iphone’s will surive for an X number of extra hours when compared to the old iphone’s, but this year apple didn’t mention anything like that this year. They just said that that iphone 12’s battery life with various options like video streaming, audio playback etc.

I am not defending the obvious issues the 12 series has, but I feel the need to clarify what the percentages here mean.

Its does NOT mean that the Home/Lockscreen is using 52% of your entire battery. Its means that, lets say you used 10% in total in that 1 hour you selected in the graph view (11-12 o'clock) the home and Lock Screen would have used 5% (52%=half) of that entire amount. The screen was lit up 50 minutes in that time frame and was active for pretty much an hour straight. That could be anything from you swiping through your home pages, to the phone simply receiving notifications that light up the screen and display the lockscreen or you being on a phone call on speaker and the display was on the entire time (and maybe displaying the Home Screen.

Example:

If you would leave your phone with the display on for an hour in the settings app (without doing anything), the battery could drain 5% in that time just by having the display on. The settings app would then show 100%. Because the settings app was responsible for the entire consumption of these 5% in that period, hence 100%.

LTE causes a lot of drain in my case, about 20% with one hour of usage. I would definitely go ahead and try using another wifi. I would say that it could be a hardware issue because then whats the reason for the phone to heat up so bad so fast.

LTE drain is largely dependent on how much power your phone's modem needs to reach the cell tower. If the LTE base station is near, that's not much. If it's far away or blocked, LTE drain is significant, yes.

I also wanted to know if anyone has encountered this weird pattern of drain where the phone doesn’t fall a single percent when being used and then the next pick up you will suddenly see the battery is dropped by 3% and again you may use the phone for like 5 min and no drain and the next pick up after that another 3% is gone. This ideally happens once my phone is around 40%

That tends to happen when your battery is aging. Percentage calculation is no longer accurate in this case. Usage then draws current from the battery, the voltage drops, and then the phone recalculates it's percentage estimate. Have a look at the battery health state, chances are it's already 80% or lower.

Yes, but this happens all the time. Just idle drain once use after the initial charge . I have no drain for about 30 -40 mins then just starts draining. I have given up n will just charge my phone more often. The stress of trying to figure it out is too much.

Same thing is now happening for me after the latest update. All apps are closed, phone is on airplane mode, and I’m now losing 15% battery overnight whereas before I only lost 1-3%. I also always put my phone on low power mode when it reaches 20% and that used to see me out for the rest of the day with light usage of texting, email, etc. Now I may have a few hours before my phone just dies. Unacceptable. This is not a new phone. I have had it since December. Please fix this, Apple, as it is clearly a software issue.

which phone are you currently using and does it last you more than a day because you said your usage is very light. I have a 12 problem that last’s me for two days but with just 3-4 hours of screen on time. Camera and LTE consume a lot of battery for me approximately 1% for every 1-2 minutes of usage on LTE or usage of camera which is very bad. If the camera consumes 1% every min then why do i even use the camera. Even the camera causes to phone to heat up real quick.

My iPhone 12 was working okay (5% overnight drain) until I closed all apps by swiping up on the screen. Then lost about 70% overnight. Turned phone off & on, then last night was back to its 5% drain.

Might not work for your phone, but suggest try not closing apps, seems to mess something up.

Interesting theory.

I have three wifi networks. Same as Mac hasn’t been an issue, but I’ll throw in “is the Mac charging/online while it’s asleep”

I will try it this week with an iPhone 11 Pro Max, iPhone 11, iPhone 12, and 12 Mini (in associated with a Mac) to see.