The 45-hour battery figure is a regional build, and Apple's own two spec pages disagree by two hours
2026-09-10Security
Apple's US page gives iPhone 18 Pro Max 45 hours of video playback. Its UK page gives the same phone 43. Same 8.75 mm chassis, same 249 grams — the difference is the SIM tray, and Apple says so in a footnote while marketing the larger number.