Apple Watch Shown Charging Through 6-Pin Diagnostic Port in New Video

Earlier this month, the team behind the battery-boosting "Reserve Strap" for the Apple Watch suggested it was possible to use the hidden 6-pin diagnostic port in the Apple Watch to charge the device, and today they've backed up their claims with a video demonstration.

In the video, an Apple Watch charging on a standard inductive charger is depicted next to one said to be charged through a power supply connected to the 6-pin port on the device. The watch being charged through the port charges slightly faster than the watch on an inductive charger, reaching a 95 percent charge at the same point the other watch reaches a 90 percent charge.


The team behind the Reserve Strap for the Apple Watch plans to use the port to create a band with a backup battery inside, allowing the Apple Watch to be charged while it's on the wrist. The product is still in the early stages of development, but it's available for pre-order for $250 from the company's website.

The Reserve Strap is not currently certified under Apple's recently released accessory program for the Apple Watch, which will allow manufacturers and accessory makers to create approved third-party bands for the device. Apple has outlined a specific set of rules for Apple Watch bands, preventing them from blocking any sensors on the device, but its guidelines do not mention bands that access the 6-pin port. For that reason, Apple's position on Reserve Strap's use of the 6-pin port is unclear.

Apple has not confirmed what purpose the 6-pin port serves, but speculation has suggested it is used by the company for diagnostic purposes. Apple may also be using the port internally for charging, as detailed in documents covering the function of its in-store Apple Watch displays.

It is not known if Apple has plans to expand the usage of the 6-pin port in the future, but TechCrunch has hypothesized that the port could eventually be used for "smart band" accessories to bring additional functionality to the Apple Watch.

Related Roundup: Apple Watch 11
Buyer's Guide: Apple Watch (Buy Now)

Popular Stories

iOS 26

15 New Things Your iPhone Can Do in iOS 26.2

Friday December 5, 2025 9:40 am PST by
Apple is about to release iOS 26.2, the second major point update for iPhones since iOS 26 was rolled out in September, and there are at least 15 notable changes and improvements worth checking out. We've rounded them up below. Apple is expected to roll out iOS 26.2 to compatible devices sometime between December 8 and December 16. When the update drops, you can check Apple's servers for the ...
Intel Inside iPhone Feature

Apple's Return to Intel Rumored to Extend to iPhone

Friday December 5, 2025 10:08 am PST by
Intel is expected to begin supplying some Mac and iPad chips in a few years, and the latest rumor claims the partnership might extend to the iPhone. In a research note with investment firm GF Securities this week, obtained by MacRumors, analyst Jeff Pu said he and his colleagues "now expect" Intel to reach a supply deal with Apple for at least some non-pro iPhone chips starting in 2028....
ive and altman

Jony Ive's OpenAI Device Barred From Using 'io' Name

Friday December 5, 2025 6:22 am PST by
A U.S. appeals court has upheld a temporary restraining order that prevents OpenAI and Jony Ive's new hardware venture from using the name "io" for products similar to those planned by AI audio startup iyO, Bloomberg Law reports. iyO sued OpenAI earlier this year after the latter announced its partnership with Ive's new firm, arguing that OpenAI's planned "io" branding was too close to its...
iPhone 17 Pro Cosmic Orange

10 Reasons to Wait for Next Year's iPhone 18 Pro

Monday December 1, 2025 2:40 am PST by
Apple's iPhone development roadmap runs several years into the future and the company is continually working with suppliers on several successive iPhone models at the same time, which is why we often get rumored features months ahead of launch. The iPhone 18 series is no different, and we already have a good idea of what to expect for the iPhone 18 Pro and iPhone 18 Pro Max. One thing worth...
Photos App Icon Liquid Glass

John Gruber Shares Scathing Commentary About Apple's Departing Software Design Chief

Thursday December 4, 2025 9:30 am PST by
In a statement shared with Bloomberg on Wednesday, Apple confirmed that its software design chief Alan Dye will be leaving. Apple said Dye will be succeeded by Stephen Lemay, who has been a software designer at the company since 1999. Meta CEO Mark Zuckerberg announced that Dye will lead a new creative studio within the company's AR/VR division Reality Labs. On his blog Daring Fireball,...
maxresdefault

iPhone Fold: Launch, Pricing, and What to Expect From Apple's Foldable

Monday December 1, 2025 3:00 am PST by
Apple is expected to launch a new foldable iPhone next year, based on multiple rumors and credible sources. The long-awaited device has been rumored for years now, but signs increasingly suggest that 2026 could indeed be the year that Apple releases its first foldable device. Subscribe to the MacRumors YouTube channel for more videos. Below, we've collated an updated set of key details that ...
Apple John Ternus 2019

Will John Ternus Really Be Apple's Next CEO?

Friday December 5, 2025 9:01 am PST by
There is uncertainty about Apple's head of hardware engineering John Ternus succeeding Tim Cook as CEO, The Information reports. Some former Apple executives apparently hope that a new "dark-horse" candidate will emerge. Ternus is considered to be the most likely candidate to succeed Cook as CEO. The report notes that he is more likely to become CEO than software head chief Craig Federighi, ...
ios 18 to ios 26 upgrade

Apple Pushes iPhone Users Still on iOS 18 to Upgrade to iOS 26

Tuesday December 2, 2025 11:09 am PST by
Apple is encouraging iPhone users who are still running iOS 18 to upgrade to iOS 26 by making the iOS 26 software upgrade option more prominent. Since iOS 26 launched in September, it has been displayed as an optional upgrade at the bottom of the Software Update interface in the Settings app. iOS 18 has been the default operating system option, and users running iOS 18 have seen iOS 18...
iOS 26

Apple Seeds iOS 26.2 and iPadOS 26.2 Release Candidates to Developers and Public Beta Testers

Wednesday December 3, 2025 10:33 am PST by
Apple today seeded the release candidate versions of upcoming iOS 26.2 and iPadOS 26.2 updates to developers and public beta testers, with the software coming two weeks after Apple seeded the third betas. The release candidates represent the final versions of iOS 26.2 and iPadOS 26.2 that will be provided to the public if no further bugs are found during this final week of testing....

Top Rated Comments

green94 Avatar
138 months ago
Was anyone else expecting this thing to be leaps and bounds faster than the normal method of charging?
Score: 16 Votes (Like | Disagree)
TheLastOfConnor Avatar
138 months ago
To be honest, that wasn't much difference and certainly not worth $250(!!!).

I can wear my Apple Watch all day, lay it on the charger at night and have it ready the next day without ever running into battery issues. I can't see this strap taking off.
Score: 10 Votes (Like | Disagree)
Onimusha370 Avatar
138 months ago
I’ll stick with my iMac, iPhone and iPad, thereby saving myself $17,000 on an Apple Watch.

Three computers that tell me the time is enough.

Great addition to this thread
Score: 5 Votes (Like | Disagree)
mdelvecchio Avatar
138 months ago
I’ll stick with my iMac, iPhone and iPad, thereby saving myself $17,000 on an Apple Watch.

Three computers that tell me the time is enough.

I doubt you could afford the top of the line model. the sensible decision would be one of the sports, but...
Score: 5 Votes (Like | Disagree)
PowerBook-G5 Avatar
138 months ago
I like this idea and all, but if Apple finds a way to make the port not work for charging, these guys are going to be screwed.
Score: 5 Votes (Like | Disagree)
Benjamin Frost Avatar
138 months ago
Good, I hope this feature can be used soon because I still haven't figured out how to charge my watch with the inductive charger that comes with it. My battery died the day after I received mine and it's been dead ever since, because MacRumors hasn't written a good how-to article on how to charge the watch.

You're the lucky one; at least you got a day's use out of it.

Think of all those who haven't even managed to take it out of the box due to MR's refusal to write an unboxing guide.
Score: 3 Votes (Like | Disagree)