Apple releases iOS 15.4.1 update to fix battery drain issues it had claimed were 'Normal' - Neowin
11 Ways to Show the Battery Percentage Indicator on Your iPhone « iOS & iPhone :: Gadget Hacks
iOS 8 Battery: How do Different Devices Perform on Latest OS
What's Draining Your iPhone Battery? - Techlicious
iOS 11.2.1 battery life on iPhone 8 Plus. Finally got over 10 hrs of usage on iPhone 8 Plus. Use to get 9.50 hrs usage on iOS 11. I turned off background
How to Automate Low Power Mode When Your iPhone Battery is Depleted - MacRumors