There’s been a lot written this morning about Reserve Strap, an Apple Watch strap designed to plug into the diagnostic port on the watch and serve as a reserve battery.

I love this idea. In fact, if you go back a few weeks, I even proposed such an idea in this post.

But I digress.

Reserve Strap’s clever is the way it overcomes a built in limitation. When you change any strap on your Apple Watch, you have to press a release button, then slide your strap to the side.

Problem is, any strap that wants to connect to the diagnostic port has to have a plug that juts out, which would prevent a strap trying to plug into that port from doing the side-to-side slide.

Reserve Strap proposes to resolve this problem with buttons on either side of the strap that compress the connector, pulling it into the body of the strap. Compress the connector, slide the strap on, release the buttons to allow the connector to jut back out and connect with the diagnostic port. Super clever.

I hope this idea succeeds. If so, it will pave the way for a wave of clever, powered Apple Watch straps.

Note that this is a product in the works. You can preorder on the web site, but there’s no guarantee that they can clear all the hurdles this product faces. And at a price of $249, that’s going to require a lot of faith.