I demand BangleJS3!

In the hopes that my voice for a next bangle shall be heard, I also have a wish list for what would make it an even greater device for version 3.

Sorry for the wall of text, you can read the conclusion for a TL;DR:

** Battery **

• The battery life of the device is the killer feature for me. If I had to charge the watch every night, I would probably forget to do it every other night (which basically means that I would stop using it). For me the battery lasts around 7 days, which is great. It would be great if there was a way to improve power-monitoring (maybe estimate power-draw of the apps? I had a few watch faces that ate my battery for breakfast).
  
  

** Speed **
IDK what the bottleneck for the responsiveness of the watch is, but it would be awesome if it could be reduced. If there was a way to have a clock the CPU or memory faster just for launching apps, that would be awesome. The performance would be perfect if you could achieve full-screen smooth scrolling using the touch screen. If it was possible to have different power-states during active use and during passive use, the overall power consumption should not be much higher I guess, since race-to-idle can also be a way to save power.

** Screen **

• Keep the transflective screen. It's awesome! I wish there were mainstream phones and laptops with these screens out there!
  
• Keep the low physical profile: I've seen smartwatches as thick as a pack of cigarettes and as chunky as a tiny phone. I've got rather thin arms, so I'd never wear such a large device. The current size is perfect.
  
• Keep the Rectangular Touch Screen. The resolution is also pretty good. A little higher resolution would be welcome, but I see how this needs to stay in balance with the CPU power / power consumption. I'd love to have a few more colors without dithering though. More colors for images + sub-pixel anti-aliased fonts for text would already do a lot for better legibility.
  
• If I could wish for anything in this regard, it would be great if the screen would fill a larger portion of the watch front. A little smaller bezels would be nice, but I also like that it's pretty rugged, so leaving some margin is also good.
  
• Arguably the resolution should stay the same so that most hard-coded coordinates in apps keep working on a new watch
  
  

** Environment Sensors and Water resistance **

• Lose the barometer: Having a hole in the case just for a barometer is a pity. It's a big compromise for water resistance for a feature that's IMHO less important than water resistance. The only way I think compromising the water resistance would make sense if the device also had a microphone, which could be a great feature as well. (Given the little computing power for sound processing and how much of the community rather develops for the watch instead of the companion app - such as gadgetbridge - I think that water resistance has still higher priority than a microphone). The one thing I would sacrifice water resistance for would be an SD-card slot + mp3 decoder + Bluetooth-audio to use it as a Walkman on the go, but IDK if that's really such a good idea or if I just think it's cool to have.
  
  

Anyway, it would be awesome to keep it on when swimming or when taking a shower. Not necessarily because I need to check my messages in the shower, but rather because I'm often afraid to forget to remove it before.

** Buttons **
More buttons or a wheel like the apple watch would be nice. Even just a second button could make a big difference, but 3 would be perfect I guess. Having a touch screen still is great for building diverse UIs and input schemas for individual apps, but I I'd love to have some standard interactions - maybe similar to an android phone - mapped to the buttons.

** Connectivity **
IDK the details, but I think bluetooth has gotten much more stable over time (with firmware updates) and that's great. But still, sometimes I have disconnects for no reason. For all apps that do some background task periodically that require a connection, this is somewhat annoying. If there was a chance to have better bluetooth (chip/antenna/whatever), this would be pretty high on my wishlist. Maybe it's a phone thing, in which case I retract my statement ;)

Also it would be great if the watch had Wifi. I wouldn't want to use it all the time as that would kill the battery super quick, but I have Wifi available all the time when I am indoors and it would be great if the watch could then work more autonomously, so I could leave my phone at home. My bet would be that a bunch of people would build low-bandwidth server applications that work well with the watch and that would be awesome. (this could also nicely tie into the other espruino powered devices)

** Contactless Payment **
Apparently the nRF52840 already has NFC functionality that could be used to perform contact-less payment operations. IDK if this is a hardware/software/legal limitation, but if I could pay using my banglejs, I could leave my phone home a lot more often.

** Health Sensors **
I never use the heart rate sensor as I found it to be too unreliable. I would love to use when doing sports. Same for sleep tracking. I found the sleep detection to be lacking, even though this was one of the main drivers of me buying the watch in the first place! (instead of returning the device, I got hooked on the eco-system ;). Maybe I should give it another go, but the last times I tried heart-rate sensor and sleep tracking I was rather disappointed.

It would be great to have an hardware upgrade here for more reliable sensors. If I could wish for anything, then also a blood oxygen sensor would be awesome.

** Conclusion **
The BJS2 is already great as is. It strikes a great balance for many features. There's a few things I would love to see improved, but at the same time I see how improving some features could be at the cost of others (also considering small form as factor a feature!). So generally I rather like to see many small improvements on the current hardware, especially reliability and more physical inputs, than a large jump in a different direction, because many things are already in a great balance.