Originally announced by third-party developers Lane Musgrave and John Arrow back in early March, one of the biggest concerns of the battery-boosting accessory "Reserve Strap" was its use of the Apple Watch's heart rate sensor as a way to provide power to the wearable. Although it was unconfirmed, there was always a possibility of the Reserve Strap obstructing normal functions of the heart rate sensor, or causing the Watch to not function altogether by interfering with skin contact completely.

Last week, after getting their hands on an Apple Watch, Musgrave and Arrow have gone back to the drawing board on the design of the Reserve Strap, coming up with a new look that acts as more of a traditional Apple-made band without blocking the heart rate sensor at all. The new Reserve Strap aims to use the 6-pin diagnostic port - hidden inside of the band port on the bottom of the Watch - as the main source of providing power to the device, shirking the heart rate sensor's magnetic inductive charging altogether.

reserve strap change

The Original Reserve Strap design (left) vs the new design (right)

Finally getting our hands on the Apple Watch has further confirmed the immense value of the Reserve Strap. Since release day, we've been executing series of tests on the Apple Watch and have some really exciting news to share today.

We've developed and tested a completely rethought design that takes advantage of the 6-pin port underneath the band slide of the Apple Watch. This port hadn't been deciphered by anyone until now but we've been able to make significant enough observations so far to warrant shifting our development focus to this new method. We're looking forward to sharing more design details and technical specification of this new Reserve Strap as soon as we can.

The company claims in its blog posts that its engineers have "been able to independently confirm that the 6-pin diagnostic port underneath the Apple Watch case can be used for charging." They continue by also noting the diagnostic port will allow for not only a higher charge capacity, but faster, more efficient charging times. The blog post also notes that the new method should improve durability of the strap as a whole and eliminate "any interference with Apple Watch functionality including taptic feedback and heartrate sensors."

reserve strap port sketch

Initial renderings of the new design (left) vs fully realized 3D model (right)

No word was given on the planned Kickstarter for the Reserve Strap, but those interested can still pre-order the device from the company's official website for $249.99. Color options will include white, gray and black, and customers will be able to choose between 38mm and 42mm strap sizes to fit their preferred Apple Watch size.

Related Roundup: Apple Watch Series 8
Buyer's Guide: Apple Watch (Buy Now)
Related Forum: Apple Watch

Top Rated Comments

DannyT2011 Avatar
97 months ago
It won't work. Look at the connector. Those of us who have our watches already know that the way to attach a strap is to slide it in. Straps won't slide with a big connector sticking out of them.

It looks like there are buttons on either side of the strap that you would pinch to insert/release. Perhaps as you pinch them, the connector will retract and then will connect to the port when you release them?
Score: 13 Votes (Like | Disagree)
elmateo487 Avatar
97 months ago
It won't work. Look at the connector. Those of us who have our watches already know that the way to attach a strap is to slide it in. Straps won't slide with a big connector sticking out of them.

Lol. This made me laugh. They have engineers who can extract info from a diagnostic post... Yet you think they didn't think of that? Especially since they have one in their hands now.
Score: 6 Votes (Like | Disagree)
Jandmtv Avatar
97 months ago
Apple covered that port for a reason. Good luck with that strap in the rain.

Yup, only to include it as a new feature with the watch2.
Score: 6 Votes (Like | Disagree)
shareef777 Avatar
97 months ago
Apple covered that port for a reason. Good luck with that strap in the rain.
Score: 6 Votes (Like | Disagree)
dannys1 Avatar
97 months ago
I take it these people are aware that having batteries in a watch band is something Apple has patented.

Which begs the question, why didn't they launch with battery bands?
Score: 6 Votes (Like | Disagree)
shareef777 Avatar
97 months ago
We all know the watch needs the iPhone to operate, and the iPhone doesn't last more then 18 hours so why does the watch need to? If you have to recharge your iPhone every night, it should be easy enough to charge the watch as well.
Score: 5 Votes (Like | Disagree)

Popular Stories

iOS 16

Apple Releases iOS 16.0.2 With Bug Fixes for iPhone 14 Pro Camera Vibration, Copy/Paste Issue and More

Thursday September 22, 2022 1:04 pm PDT by
Apple today released iOS 16.0.2, addressing a number of bugs that iPhone 14 owners have been experiencing since the new devices launched. iOS 16.0.2 comes two weeks after the launch of iOS 16, and it follows iOS 16.0.1, an update made available to iPhone 14 owners on launch day. The update is available for all iPhones that are capable of running iOS 16. The iOS 16.0.2 update can be...
apple watch series 7 aluminum colors yellowbg

Don't Want the Apple Watch Ultra or Series 8? Amazon Has Record Low Prices on Series 7 Models This Week

Friday September 23, 2022 6:56 am PDT by
The Apple Watch Series 8 and Apple Watch Ultra are now available to purchase, but if you aren't interested in these updates you can save a lot of money on Series 7 models right now on Amazon. Note: MacRumors is an affiliate partner with Amazon. When you click a link and make a purchase, we may receive a small payment, which helps us keep the site running. The best deals are on cellular...
Dynamic Island For Android Users Feature

Android App Copying iPhone 14 Pro's Dynamic Island Released on Play Store

Thursday September 22, 2022 7:57 am PDT by
A copycat version of the iPhone 14 Pro's Dynamic Island has arrived on Android's Google Play Store in the form of an app called "dynamicSpot." The app, still in beta, offers customers several different experiences at the top of their smartphones. In its current form, dynamicSpot offers playback control for songs, timers, battery status, and more features coming soon, according to the app's...
maxresdefault

Video Review: Four Days With the iPhone 14 Pro Max

Wednesday September 21, 2022 7:49 am PDT by
Apple on Friday released the new iPhone 14 models, and MacRumors videographer Dan picked one up on launch day. He's been using the iPhone 14 Pro Max non-stop since it came out, and over on the MacRumors YouTube channel, has shared his initial thoughts on the day-to-day experience with the latest iPhone. Subscribe to the MacRumors YouTube channel for more videos. Dan's mini review highlights...
14 vs 16 inch mbp m2 pro and max feature 1

New 14-Inch and 16-Inch MacBook Pros Reportedly Launching Later This Year

Friday September 23, 2022 7:08 am PDT by
Apple plans to release new MacBook Pro models in the fourth quarter of 2022, according to supply chain publication DigiTimes. The report does not mention specific models, but it very likely refers to the next-generation 14-inch and 16-inch MacBook Pros given that the 13-inch model was already updated earlier this year. There has been uncertainty surrounding the timing of new 14-inch and...
facebook meta

Meta Sued Over Tracking iPhone Users Despite Apple's Privacy Features

Thursday September 22, 2022 5:12 am PDT by
Meta is facing a new proposed class action lawsuit that accuses it of tracking and collecting the personal data of iPhone users, despite features and policies made by Apple which are meant to stop that same type of tracking. In August, it was revealed that with the Facebook and Instagram apps, Meta can track all of a user's key taps, keyboard inputs, and more, when using the in-app browser....
AirPods Max 2022 Colors

Ten Things AirPods Pro 2 Tell Us About AirPods Max 2

Saturday September 24, 2022 1:00 am PDT by
Upon the release of the second-generation AirPods Pro, the AirPods Max became the oldest current-generation AirPods product still in Apple's lineup. Introducing several new features like Adaptive Transparency and the H2 chip, the second-generation AirPods Pro may provide some of the best indications yet of what to expect from the second-generation AirPods Max. Almost two years later, rumors...
new airpods pro ear tips

Apple Explains Why Second-Generation AirPods Pro Ear Tips Are Incompatible With Original AirPods Pro

Thursday September 22, 2022 3:12 pm PDT by
Apple today explained why the new silicone ear tips for the second-generation AirPods Pro are not officially compatible with the original AirPods Pro. In an updated support document, Apple said the original AirPods Pro ear tips have "noticeably denser mesh" than the second-generation ear tips. Apple did not provide any additional details, but the mesh density could result in acoustical...
AirPods Pro Second Generation 2 Pairing Feature 1

AirPods Pro 2 Engravings Appear in iOS During Pairing and Connecting

Friday September 23, 2022 9:40 am PDT by
Customers who personalize their second-generation AirPods Pro charging case with an engraving will now have that engraving reflected directly on iOS as they pair and connect their AirPods Pro. Apple allows customers to personalize their AirPods Pro charging case with a special engraving that can include select emojis and Memojis. Unlike before, starting with the second-generation AirPods...