The last update killed my battery!
How to diagnose battery drain on iPhone.
Causes
- First all there will be a lot of housekeeping, re-indexing and photo curating going on after any update or after a transfer from another phone. iOS17 added pets’ faces, that will take power to curate so charge all night every night.
- If you have iCloud photos turned on there will be a lot of Wi-Fi traffic while they are re-curated. iCloud photos is turned on by default so if you have not explored Settings, (Your name), iCloud you will not know that some or all your photos actually live in the iCloud depending on what you pay for extra storage.
- There may be apps that are inherently incompatible with the new iOS. Start by removing any cheap App Store VPN or security apps. Apart from being totally unnecessary they are also a strong contender for runaway power usage redirecting your web traffic.
- Animated lock screens such as weather or astronomy, and widgets requiring location all use a lot of battery. Avoid if pissible.
- Many mainstream apps need an urgent update, so go to App Store and scan through your apps for those that need updating. While there, uninstall any apps you haven't used for some time. They are unnecessary update burden.
- Is it summer time? Outdoors your phone will automatically turn up the brightness to maximum. It will also get hot in the sun. Consider using dark mode on OLED phones ie notch phones.
- Check the battery usage chart in battery settings for any obvious bad apps. Unfortunately not every background process such as photo curation is shown, but Whatsapp background processing for example is.
- Any streaming apps or apps that can run with phone closed, or Clocks that hold the phone unlocked, always force close them afterwards, despite the accepted wisdom not to.
- Always on will obviously use more battery than without it.
- Check battery capacity is above 80% in Battery health
- Settings, Cellular (or Mobile data) turn off as many functions as possible as cellular uses more power than Wi-Fi
- If you sync by computer then make sure that"show this device when on wifi" is turned off. Or if you need it on, then ensure "automatically sync" is turned off.
- Hi-Res Lossless Apple Music is a heavy power and data user
- Push notifications for heavy email users could be replaced by 15 minute fetch.
Only after all that do you need to do the simple stuff advised in
iPhone Battery and Performance - Apple Support
Sick Battery
Even batteries with "Health" greater than 80% can be sick. Symptoms are
- Battery charge level % jumps, gets stuck, or drops to nothing suddenly
- Battery seems to have a steep discharge curve overnight even after doing all of the above checks and after waiting a week after tge update.
In these cases see another User Tip Check iphone battery for self discharge
