Is it true that if your iPhone battery health goes below 80% within a year of buying it, you get a battery replacement for free or a replacement phone? - Quora
Make iOS Alert You When Your iPhone Only Has 5% Battery Life Remaining « iOS & iPhone :: Gadget Hacks
Apple 'Service' Alerts for DIY iPhone Battery Swaps Are a Blow Against Right to Repair | WIRED
Apple Is Locking iPhone Batteries to Discourage Repair | iFixit News