A little follow up on my previous post.
In my company we have more than 100 users with iPhone 11 purchased on July 2020 and many (me included) have raised an issue that the phone is inadequate for our work due to fast battery drain.
We mainly use the phone for e-mail and messages between us (5 to 10 per hour) and access to a site over the browser to enter some data 5-6 times a day for about 10 minutes per time (plus phone calls off course).
With these many barely get through the day (80% to 20% charge) and some don't even reach the afternoon.
So our technicians performed some operational tests and came up with the bellow:
Main Settings:
Newly reset 6 months old iPhone 11's with Background app refers off, Location services only maps, WIFI calling, find my iPhone and share my location on, raise to talk off, Siri search off, App and IOS update off, Bluetooth off, 1 mail account and iCloud on.
stand by drain 14-20% per 12 hour.
Enabling airplane mode (working with wifi calling) stand by drain 6-12% per 12 hours
Disabling notifications stand by drain 2-4% per 12 hours. (actually my phone went from 93% to 55% in 5 days stand by).
So notifications seems to be a major culprit here but we do need them so turning them off is out of the question and obviously airplane mode is out of the question for people on the road most of the time.
Based on the notifications finding techs began to suspect the screen-on, battery usage.
So they put 5 iPhones on home screen without any widget, dark mode on and 20% brightness, no open apps and all above settings as described and let them on for 1 hour. The battery drain was 22-36% . Even continued the test until the phones went off and it took them 3.5-5 hours in total (sitting there, doing nothin with the screen on). That's a screen battery drain of above 1% per minute.
Now further to the above we performed the same test with safari open on a news page that auto-refresh and the results were double as bad. No phone lasted more than 3 hours.
To conclude they checked the battery status with iMazing and they found that the battery health displayed on the iPhones was 2 present above the the health reported by the program ranging from 90% (124 charging cycles) to 96% (47 charging cycles).
Out of curiosity Techs performed the same test on a same lot brand new spare iPhone and a coworkers iPhone still on iOS 13.
The new iPhone performed much better but still way less than the IOS 13 one which by the way had 99% (98 according to iMazing) battery health after 93 charging cycles.
Their opinion is that IOS 14.3 is too heavy on the battery and actually it kills it as the battery health seem to degrade much faster than the !OS 13 one. That's why it performs so much better on new iPhones were the battery is on its peeks.
With the above results the management decided to return all affected iPhones (42) to our ISP supplier and get them back only when they are functioning within described specs and all necessary settings on (the claim is that we buy phones based o functionality and operational performance to meet out needs and not technical data), so we wait a response from them.
For the mid time i got from the Techs a mid range android phone on Monday morning, fully loaded with my apps and i am charging it now for the first time from 27% battery. If i get used to the android UI and logic i think i will ask to stick with this one.
