Apple Watch Series 12 Review: New Sensors, Same Battery

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Overview

The Apple Watch Series 12 looks so much like last year’s model that the biggest change sits on the back of the case. Apple redesigned the optical and electrical heart sensors, paired them with the new S11 chip, and built a Readiness score on top. It is priced from $549 CAD in the 42mm aluminum GPS version, and it requires an iPhone 11 or later running iOS 27.

Canadian buyers can order the Series 12 through Amazon.ca, where the 42mm GPS model lists at $549 CAD. Engadget scored it 9.1 out of 10 and called it a solid upgrade, while BGR judged the health improvements worthwhile but pointed to an unchanged battery rating and a design that “looks like an Apple Watch.” The question for most Canadian iPhone owners is which watch they are coming from, since BGR recommends it for Series 9 owners or older and finds it harder to justify from a Series 10 or Series 11.

Key Specifications

Apple Watch Series 12 Health Sensing and Readiness

The redesigned sensor array is the reason to care about this model. Apple measures heart rate every five seconds through the day and samples heart rate variability up to 24 times more often, and BGR notes that stationary readings on earlier models came about every five minutes. Independent checks are encouraging: The Verge’s Victoria Song found the readings close to a Polar H10 chest strap, and Engadget’s Cherlynn Low saw them land within two beats per minute of her Fitbit Air. Apple’s own accuracy claim rests on a company-sponsored study of over 1,000 participants, per BGR, so the outside comparisons carry more weight.

Readiness turns that data into a 0 to 10 score with a plain recommendation, from Recover to Go For It. CNET’s Vanessa Hand Orellana pointed out that it keeps updating with daytime vitals and comes at no extra cost, while Oura charges a monthly fee for similar insight. Gear Patrol adds that the feature will not reach older Apple Watch models through a software update. It also needs a baseline of about seven nights of sleep data, and BGR had only a few days of usable data at publication. If you are weighing it against a smart ring, our Oura Ring 5 review covers the subscription side of that trade.

Battery Life and Fast Charging

Apple rates the watch for a full day and describes the outdoor-workout figure as 25 percent longer than the previous model. BGR’s reading is less generous: the day-to-day rating matches the Series 11, with no extra endurance to show for the new sensors. The Verge’s Song noticed no battery penalty from the continuous heart-rate tracking, and Engadget’s reviewer reached the end of most low-activity days with about half the charge left, which is consistent with a watch that still wants regular charging.

Charging is where the change shows. Apple says 15 minutes adds up to 12 hours of use, and reviewers measured it: Engadget went from 51 percent to 79 percent in a 12-minute charge, and The Verge from 20 to 64 percent in 20 minutes. For a watch you also wear to bed for sleep tracking, a short top-up before bedtime is the practical fix for the lack of multi-day endurance.

S11 Chip, Gestures, and Case Options

BGR describes the S11 chip as snappy, with quick app launches and smooth scrolling, but adds that the jump is not dramatic if you already own a Series 11. The more noticeable interface change is a single-tap gesture alongside double-tap and wrist flick, which Engadget said makes hands-free use of the watch actually functional.

The case lineup grows. Ceramic returns in pearl white and night blue, the first ceramic Apple Watch since the Series 5 according to BGR, alongside titanium and aluminum with Apple’s Ceramic Shield 2 glass. Several announced software features are still missing: Live Rewind and Siri Recaps are slated for later this year, per Engadget and Gear Patrol, so part of the launch story cannot be judged yet.

How Does It Stack Up Against the Competition?

The Series 12 sits in the same starting-price tier as Google’s and Samsung’s newest watches, so the deciding factor is the phone in your pocket rather than the sticker.

Is the Apple Watch Series 12 Worth It?

It fits an iPhone owner on a Series 9 or older, or someone buying a first Apple Watch, who wants heart rate and sleep data that updates all day without a subscription. Newer hardware is the point here: the sensor redesign and Readiness are not coming to older models through software, so an older watch has more to gain than a Series 11 does.

Series 10 and Series 11 owners can reasonably wait, as BGR suggests. If multi-day battery matters most, the Ultra 4 is the step-up at a much higher price, and 9to5Mac’s Chance Miller measured 48 hours on a single charge with it. Android owners cannot use the Series 12 at all and should look at the Pixel Watch 5 or Galaxy Watch9, both of which also offer dual-frequency GPS for runners.

Apple Watch Series 12

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Marcus WebbSenior Editor 𝕏

Marcus has been hunting for the best tech and gear for over 40 years — as a coder, gamer, and lifelong outdoors enthusiast, he knows the gap between a good spec sheet and something that actually holds up.

How this was made: Researched and written with AI from manufacturer specs, independent tests and published reviews, then checked by automated quality checks. We haven’t tested this product ourselves. How we review →