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Ok I'm able to connect again thanks to @Ganblejs's https://espruino.com/ide suggestion, thank you!

It looks like the Bangle js App Loader loses track of which Web Bluetooth connection is active or cannot resume the last active connection after disconnecting or closing Chrome. Very frustrating.

Pairing again with the Bangle js App Loader just sits at 'getting device info' despite apparently trying to initiate a new Web Bluetooth connection.

With the https://espruino.com/ide app I can pair and create a new active connection and then switch back to the Bangle js App Loader where its connected correctly and loads the device info normally.

Even the https://espruino.com/ide app will throw errors if you select one of the existing dead Web Bluetooth connections but at least you can create a new connection there and get a working connection.

Thanks @Gordon for the recovery mode tip. If the watch ever gets really stuck I will try that option.

Now back to picking clocks and browsing the apps. Thank you @Ganblejs and @Gordon!

Thank you for your suggestions @Ganblejs and @Gordon. I'm going to try both suggestions today after I finish work and will follow up with the results.

Recently setup my Bangle JS2 and everything connected in Chrome Web Bluetooth fine.

Now when I try to refresh my apps its stuck on getting device info. Any suggestions? I tried restarting the watch and the computer.

This looks excellent and a believable answer is all I'm looking for. From what I've seen, all the mainstream trackers like Fitbit etc give varied results for calculating this so it doesn't need to be that precise. This looks like a great start to the math! Thanks for indulging the idea and drawing up some calculations.

That would be great if someone has the understanding to make an app for it. It would pair well with the Run app.

This article describes a formula to get the calories burned. You're right about the metrics of steps, heart rate, height and weight all being key to calculating the total. Even if it's not ultra precise, having even a general idea of how many calories burned would be great.

https://www.verywellfit.com/how-many-calories-you-burn-during-exercise-4111064

Are there any apps for Banglejs 2 that offer calories burned estimate? It’s one of the features I’d like to use in a smart watch and many of the mainstream fitness watches seem to offer it.