Apple Watch Series 3 Prototype May Show Contacts for Potential 'Smart Bands'

Apple may have tested "Smart Bands" for the Apple Watch, according to a new image of a prototype device.

apple watch series 3 contacts prototype
The image, shared by developer and prototype collector Giulio Zompetti, shows two metal contacts inside an Apple Watch Series 3 prototype's band slot, either side of the diagnostic port. Zompetti postulated that the "two unusual pads are exposed to the band," and may be a kind of iPad-like "Smart Connector," much like those from various iPad models, used to accommodate a "Smart Band."

Apple has filed a large number of patents around smart Apple Watch bands, indicating that it is something that the company has actively considered. Some patents showed how features such as biometric authentication, self-tightening, and LED progress indicators could be integrated into a band, while others explained a modular approach with batteries, displays, cameras, blood pressure sensors, and more.

The Apple Watch's hidden diagnostic port was once speculated to facilitate Smart Bands. At the time, the diagnostic connector, which is purportedly based on the design of the Lightning connector, was said to be capable of supporting future accessories.

Third-party accessory makers were able to develop an external battery band that could charge the Apple Watch through the diagnostic port, but changes to the Apple Watch's software prevented the strap from ever coming to market. However, other smart bands not reliant on the diagnostic port have become available in recent years.

In the past, Zompetti has shared images of prototype versions of the original Apple Watch, first-generation iPad, third-generation iPod touch, and iPhone 12 Pro.

Related Roundup: Apple Watch 10

Popular Stories

iPhone 17 Pro Dark Blue and Orange

iPhone 17 Release Date, Pre-Orders, and What to Expect

Thursday August 28, 2025 4:08 am PDT by
An iPhone 17 announcement is a dead cert for September 2025 – Apple has already sent out invites for an "Awe dropping" event on Tuesday, September 9 at the Apple Park campus in Cupertino, California. The timing follows Apple's trend of introducing new iPhone models annually in the fall. At the event, Apple is expected to unveil its new-generation iPhone 17, an all-new ultra-thin iPhone 17...
iPhone 17 Pro Iridescent Feature 2

iPhone 17 Pro Clear Case Leak Reveals Three Key Changes

Sunday August 31, 2025 1:26 pm PDT by
Apple is expected to unveil the iPhone 17 series on Tuesday, September 9, and last-minute rumors about the devices continue to surface. The latest info comes from a leaker known as Majin Bu, who has shared alleged images of Apple's Clear Case for the iPhone 17 Pro and Pro Max, or at least replicas. Image Credit: @MajinBuOfficial The images show three alleged changes compared to Apple's iP...
xiaomi apple ad india

Apple and Samsung Push Back Against Xiaomi's Bold India Ads

Friday August 29, 2025 4:54 am PDT by
Apple and Samsung have reportedly issued cease-and-desist notices to Xiaomi in India for an ad campaign that directly compares the rivals' devices to Xiaomi's products. The two companies have threatened the Chinese vendor with legal action, calling the ads "disparaging." Ads have appeared in local print media and on social media that take pot shots at the competitors' premium offerings. One...
iphone 16 pro ghost hand

iPhone 17 Pro: 5 Reasons Not to Upgrade This Year

Monday September 1, 2025 4:35 am PDT by
Apple will launch its new iPhone 17 series this month, and the iPhone 17 Pro models are expected to get a new design for the rear casing and the camera area. But more significant changes to the lineup are not expected until next year, when the iPhone 18 models arrive. If you're thinking of trading in your iPhone for this year's latest, consider the following features rumored to be coming to...
iOS 18 on iPhone Arrow Down

Apple Preparing iOS 18.7 for iPhones as iOS 26 Release Date Nears

Sunday August 31, 2025 4:35 pm PDT by
Apple is preparing to release iOS 18.7 for compatible iPhone models, according to evidence of the update in the MacRumors visitor logs. We expect iOS 18.7 to be released in September, alongside iOS 26. The update will likely include fixes for security vulnerabilities, but little else. iOS 18.7 will be one of the final updates ever released for the iPhone XS, iPhone XS Max, and iPhone XR,...

Top Rated Comments

Mac Spec Avatar
55 months ago
Former Apple Retail employee here - early Apple Watches were "imaged" via a hardwired connection through those ports. The tool was black plastic with pins that matched up with what is shown in the photo. These were used for the watches in the display table table - the ones not touched by customers.
Score: 10 Votes (Like | Disagree)
jz0309 Avatar
55 months ago

Fair, but how about a battery that lasts a full day?
My AW4 when new lasted me 2 days…
It all depends on your usage…
Score: 6 Votes (Like | Disagree)
easy4lif Avatar
55 months ago
I’m actually surprised apple never allowed or introduced smart bands. Extra battery, more sensors, health monitor.

such potential!
Score: 5 Votes (Like | Disagree)
subi257 Avatar
55 months ago

A band that gives you one week battery life would be nice.
But you would need one for both arms so that one doesn't look wimpy compared to the one with the 3lb battery.
Score: 3 Votes (Like | Disagree)
fwmireault Avatar
55 months ago
Imagine trying to update your smart bands firmware on your S3, and you don’t have enough storage to update

oh wait…
Score: 2 Votes (Like | Disagree)
apparatchik Avatar
55 months ago

Wishful thinking…
It is literally a wish, my SE already lasts me 2 days, so the band would just have to provide two times the built-in battery, not a stretch per se...
Score: 2 Votes (Like | Disagree)