iPhone 12 battery draining fast

Brand new iPhone 12 mini. Went to bed with 100% woke up with 68%. No apps were running I haven’t even installed anything yet. I am connected to WiFi what is wrong with this battery drain? Why isn’t the phone sleeping?

That is the question of many here. It appears to be a software problem.

I've already replaced my iPhone 12 and had the same problem with the new one.

I think the only thing we can do is wait for an update.

I've never heard of anyone getting that kind of battery life.

If I was out in a normal area, I expected to be down to 60% charge on my 11 Pro Max by the end of the day.

Inside a building with one bar of service, it would be more like 25%.

I can totally corroborate Augloz's claim about the battery performance of the 11 Pro Max. For over a year of using it, I would charge every other day and sometimes after 3 days and that has been consistent.

Yes, your testing suggest that it’s not a problem with the operator but a dual sim bug in the new 12 series. It should be obvious by now and I hope Apple will release a fix soon. All should contact Apple support. Eventually this will get Heard- if it isn’t already by now.

Lestat09 wrote:

Makes me wonder though, if it's a bug then how come only the 12 series are affected and not the 11 series?

Yes, 11 series also have been affected. I have seen some reports in Chinese forums.

Oliver S. wrote:

Yes, your testing suggest that it’s not a problem with the operator but a dual sim bug in the new 12 series. It should be obvious by now and I hope Apple will release a fix soon. All should contact Apple support. Eventually this will get Heard- if it isn’t already by now.

Yes, we 'd better to send more feedbacks to Apple.

In the meantime I observed that both, the WiFi and cellular connection is bad on my iPhone 12. Most of the time I only get 1/5 bars for cellular and only 1-2 bars WiFi (while sitting next to the router). That would explain that the battery drain doesn‘t exist while using airplane mode. In addition to that the battery overview doesn‘t show any app information which also leads to some behind the scenes activities (looking extensively for signals).

I have a few days left in which I can replace my (already replaced) iPhone without any problems and I‘m unsure what to do. For me it looks like faulty modems (with hardware issues, no software issues).

So I have tried a couple of things now, and it seems like it only drains a lot of battery when low power mode is on. I used low power mode two nights in a row with only WiFi on, and the phone went from 100% to around 70%. This happened two nights in a row (8 hours both times). Tonight I turn low power mode of and had the exact same settings (only WiFi turned on) and it was 100% at midnight and 100% when I woke up approximately 8 hours later. Maybe you guys can try this and see if it works. Maybe it’s something wrong with the low power mode which makes some phones drain a lot of power!

Well, I have never used the low power mode ever so that doesn't even apply to my case. As per experience, resetting network settings solved the problem for 5 days and now the 20 to 25% nightly battery drain came back. It's inconsistent. Can't tell if it's hardware or software. I'm on my 1st replacement and if this doesn't disappear before the 14th day, I'm returning it and will try the Pro Max but then someone has already reported on this thread that this battery issue also happens to the Max variant.

In case you all haven’t tried this, I noticed my new iPhone 12 pro max draining battery like crazy and saw that the exposure notifications was on and running in background all night. This is something attached to the Covid-19 exposure. I also saw that my phone was testing noise around me for hearing exposure. I turned both off and my battery stopped draining while idle to a normal rate. Not sure if that’s your issue as well but it fixed mine!

Single or dual sim? In case of latter no fix on the horizon yet but if only one line try resetting network settings first if that doesn’t help do a restore using finder on your Mac. The latter fixed it for me

There is no single sim variant. My is eSIM and physical sim like most except Asia models. I suggested to December girl to restore because I had the battery drain once when using only eSIM. After restore just one line works flawless with great battery life. Though my issue is not fixed as I normally use two lines which still suffers from excessive battery drain, now only if having both lines active.

Actually the only countries that have the dual "physical" sim variant are China and Hong Kong. The rest of Asia will be having the single sim tray that doubles as dual sim the other one being eSim. I happened to have the Hong Kong variant with dual physical sim not the eSim. But I never used 2 sim cards ever. I only have one number so I'm perplexed why my battery drains like crazy when only one line is active.

My wife 12 Pro very hot while using and charging. It will not fully charge usually charge up to 50-60% and about 1 hour later is dead. called apple blamed on apps draining phone. must do a factory reset, which will magically fix everything. Right!!!!