Apple Watch Series 12 Adds 24-Hour Battery and 5% Larger Display at $399
Updated
Updated · MacRumors · Oct 6
Apple Watch Series 12 Adds 24-Hour Battery and 5% Larger Display at $399
3 articles · Updated · MacRumors · Oct 6
Summary
$399 Apple Watch Series 12 arrives as Apple’s clear new-buy recommendation, offering three generations of upgrades over the discontinued Series 9 at the same starting price.
24-hour battery life, 30-minute charging to 80%, and a thinner 9.7mm case headline the hardware changes, alongside displays about 7% larger on the smaller model and 5% larger on the larger one.
Health and fitness gains drive the upgrade case: the S11 model adds always-on fourth-generation optical sensing, heart-rate checks every five seconds, more frequent HRV tracking, Readiness, Recovery HRV, and daytime vitals.
Series 9 owners still get watchOS 27, ECG, wrist temperature sensing, Double Tap, sleep apnea and hypertension notifications, so the upgrade looks strongest for training-focused users, swimmers, and snorkelers.
Used or refurbished Series 9 units can still make sense at a steep discount, but battery health and warranty may quickly outweigh the upfront savings.