iPhone 12 battery draining fast

Brand new iPhone 12 pro max and battery the completely drained after an hour phone call. The back of the phone was completely hot. Had on apple case and charged with apple power block and cords. Wondering if it’s worth it.

On my new day old 12 pro, I slept with 100% and woke up with 70% six hours later! The whole reason I switched from Samsung to iPhone was the hype about battery life and I cannot be any more disappointed!

Here's my continuous testing of my 12 Pro Max both on standby and with light usage and how the battery has been behaving strangely and unpredictably. 

12/09/20

6PM - fully charged 100%

12/10/20

7AM - 100%

11AM - 99%

6PM - 97%

Note: on standby all day

12/11/20

6AM - 93%

12N - 90%

6PM - 83%

Note: with very light usage throughout the day. 

12/12/20

6AM - 53% What the 🤬?!

30% drain overnight after 2 days of consistent great battery? What gives?

Same here on the standby drain.

However, think I found something interesting. I've 2 SIMs at the same time and they're both non-5G ones and are both on the same Belgian mobile operator.

After reading something in a French forum, I decided to disable one of them (the primary physical one) and guess what: drain has stopped ! You can see it in the graph when the battery level goes from diagonal to horizontal. I've also disable mobile data since the 2nd SIM has a very low data allowance included with it. All these tests were done when connected to WIFI all the time.

I'm now doing the same with the eSIM one and report back with the results. The small dip that you see at the end of the slope is when I did the switch but I left the mobile data on this time. I then switched off to be in the same case as before. When I have some data to report, I'll do so.

On the fence to install 14.3 beta since I've also heard some feedback that it solved the issue.

So, it seems that the problem comes from my physical SIM since, with it activated exclusively, and with the mobile data off, the drain is still evident.

After I reverse it (eSIM on + physical SIM off) and still no mobile data, the drain has stopped as illustrated by the yellow circle:

Can anyone try to replicate this behavior?

Hi all,

I have the same issue. I've my iPhone 12 Pro for 2 weeks now and I've had this issue twice.

Overnight, with no activity what so ever, the battery drains from around 50% to 0%.

I've enabled dark mode, disabled background app update, disabled 5G and all the other "battery" saving tips out there, but it hasn't helped. The straight line down, with no screen activity is just not normal.

I also have an audio issue (https://discussions.apple.com/thread/251958844) so really considering returning it and switching to Android...

Aaaaaargh.

Fcking apple.

My first message was written at the beginning of this thread, I’ve already tried everything.

I saw that some guys replaced their physical sim with esim and it’s helped.

But NOT FOR ME.

80%->64% for 8 hours.

So, Vodafone UA users, esim will not solve this issue. Returning to physical sim has some inconvenient. Don’t waste your time for it.

Battery on mine seems to be draining really fast.

I only got it 2days ago 12 pro max.

battery down to 54% at 11am. That won’t last all day. I’ve got it back in the charger before lunch time.

I noticed the same yesterday. Feels like a 3/4 year old battery.

Hi NittyMDev,

I switched to 3G after reading your post and it helped.

At 11:30 last night the battery was at 61%, then I changed voice & data to 3G. I usually enable low power mode and switch off WiFi before going to bed, I did that also.

In the morning at 8, I found the battery at 55% which is just a 6% drop, otherwise it would have dropped 16%.

So it clearly shows the battery drain is happening due to the network connectivity.

Nobody would like to use 3G on a phone that is 5G capable. Waiting when Apple is going to fix this !

But at least I’m happy, they provided this forum so that we can help each other.

I went today morning to Apple shop. They were very kind and they told me. YOUR BATTERY IS GOOD. I told them it’s not. I charge it all night and In morning I came and I lost 16% in stand by mood. For 45 minutes. They said (WE DO Not KNOW. LEAVE YOUR PHONE FOR 14 DAYS AND WE Will CHECK AGAIN) wtf ..........

I am still in Apple shop and I am really angry. And disappointed. This is Apple problem not mine. Not ours. They should fix it. Or pay for it. At least change this phones with new ones. By the way I have Apple care and it’s nothing.

I am glad you found that helpful.

I’m eager to find out if the new modem firmware update in 14.3 improves the power consumption, even if in the slightest way!

Updated this morning. Will go with my normal usage for rest of the week and see how the experience would be.

Left side of the graph: before 14.3 (IOS 14.1) and right side after upgrade to 14.3. Same conditions on both, with a slight bit more of 4G usage yesterday than today (all day in connected to WIFI).

Clearly a difference but it is enough for me to keep the phone? I cannot see an alternative for it if I want to have a small form factor coupled with high performance specs. I guess my only hope is that Apple solves it in time since they have a lot to loose if they don't.

I’m also using Airtel sim. Some people who said that the issue got resolved, are saying, they got carrier update along with iOS 14.3 update.

So I guess we need an update from Airtel carrier as well, I’m not sure !

Hi hafz88,

Did you get your phone from an Apple Licensed seller? If you did and you are within the manufacturers warranty, how can they refuse to allow you to return that phone? Some others have also said the same thing. I’m don’t understand how they can do that, legally.

Hi kvs2407,

The carrier updates are a part of iOS 14.3, you don’t need anything from your carrier. Apple incorporated the carrier updates into iOS 14.3. Just update the iOS and you’ll have all the inclusions.