Question: Q: iPhone 12 battery draining fast

I am also experiencing the same issue ... all my iPhones in past have been great with battery idle but this time around nothing running in background and battery drains faster then usual even with 5 g off.

Experiencing the exact same "issue" with my iPhone 12 pro (128GB).

I compared it with my girlfriend her iPhone XR (64 gb) last night. Her phone started of with 64% remaining where mine was at 94%. Both phone were left idle over a time of 8.5 hours. The next morning the iPhone 12 pro drained two 84% while the XR was at 63%.

Both phones had almost no background activity and are connected to wifi (5ghz).

The only difference between them is that the iPhone 12 pro has dual sim set up and the XR only uses one (physical) sim.

But that shouldn't drain your battery that much, should it?

That is simply not true, I'm an engineer working in the mobile telecom industry and the discharge rate currently seen on my iPhone12 is a faulty curve. I feel no point in debating that, as this is just a simple scientific observation that I already cross-referenced with a known-to-be-good situation both both the iPhone11 and the iPhone12 under normal conditions.

Please check both curves, on the top you can see a drain, regardless of any handset usage during day OR night AND despite low-power mode. Any engineer can tell you this is abnormal behaviour. On the bottom you will see a 'normal' discharge curve, where you can clearly see it's not a straight line down the hill but is depending on usage etc. Note: both are made on my iPhone12Pro, the bottom one differs in 1) no second 5G SIM (in 4G mode only) enabled and 2) low data mode mode enabled on the first primary eSIM. I'm currently testing to see what actually caused the difference in discharging by disabling low data mode on the first eSIM. If the discharge rate continues to be 'normal' then there is a clear indication that enabling the second SIM caused abnormal behaviour. That is not 'me too', that is just a normal observation. If you think it's normal then you're perfectly entitled to that opinion, but then there is little you can contribute in this topic I'm afraid. It is my personal and professional opinion that this is not normal and considering the fact that Apple has accepted bug reports, fixed the issue and contributed them to me in the release notes I think I'm still doing a useful job here :-)

I spoke to Apple support today & they ran diagnostics saying that everything checks out. I imagine what this means is that there is a software issue causing the battery to drain - hopefully they sort it soon. It 100% isn’t normal for all apps to be closed, background app refresh off, Bluetooth off & lose 40% charge overnight. To illustrate here’s my battery view overnight.

my 12 Pro looks exactly the same. Never seen this on my iPhone before. I believe it occurred after 14.1 update but I’m not 100% sure. No plateau just straight downhill.

Exact same issue here. Turned off all background app refresh too closed down all open apps. Phone went from 97% to 55% while idle overnight. Insane!

I’m still experiencing inconsistent battery life... last night a11pm phone 100% charged but woke up at 8am and phone lost 25% just at idle . There’s something bad going on here and I believe software will not fix. Have our 11 pro max sitting next to it both taken off charger at same time at 100% and it lost 1% battery both running same iOS .

I always start my day with a fully charged phone and my 12 Pro, by midday only has around 40% battery left. The battery cannot last an entire day without charging in the middle of the day. Also the MagSafe charger is ridiculously slow. After close to 2 hours of charging I only got 10% more.

I have the same issue.

Lost round about 30% in 10hrs at night. My iPhone 11 lost in the same time around 5%.

May i need to send back my iPhone -.-

its not the point dude.

the point is draining the batterie on idle