Subscriptions have increased rapidly due to Apple 's exchange of discounts on batteries, causing a significant delay in replacing the battery of iPhone 6 Plus - GIGAZINE
Apple's discounted battery replacement program ends soon | TechSpot
Apple's $29 Battery Replacement Program Does Not Require a Failed Diagnostic Test - ExtremeTech
$29 battery exchanges for iPhone 6 and newer now available at most Apple retail locations | AppleInsider