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You want to avoid going much faster that that though - and also avoid drawing stuff to the LCD if it's off.
I looked at the pizza timer app code :
https://github.com/espruino/BangleApps/blob/master/apps/pizzatimer/app.jsSeems that it has a interval time of 500ms for menu , and it does not check if LCD is ON before draw calls? So if I change that I should notice improvement of battery usage?
I'd say my battery usage with using this app is in the order of 5-10 days , just guessing.
d3nd3-o0
@Gordon
Honestly, when you're wearing the watch the accelerometer power consumption isn't the biggest worry - you're looking at 0.4mA, which is still over 800 hours (30 days).
What kind of battery life are you seeing?
The biggest issue is the time the screen is on (when it's drawing 55mA!) - so I'd say in settings, disable wake on twist/etc, and also wake on BTN2, and maybe lower the LCD timeout. Then the watch will only turn the screen on if you press BTN1 or 3, and is harder to accidentally get into the launched.
Not noticably...
It would affect other apps/widgets and things like step counting - and as above, the difference isn't actually that big.
As above - LCD is by far the biggest power draw (or if you've enabled an HRM app that'll draw a bunch of power).
It's always able to go into low power sleep modes inbetween timers - so having a 1 second interval isn't going to hurt power consumption too much (I just tested, and it's like 0.02mA or something very small). You want to avoid going much faster that that though - and also avoid drawing stuff to the LCD if it's off.
It's just that wake on twist/step counting/gestures/etc rely on it. There's also code that kicks watchdog timers, handles the BTN3 reset/etc that needs to run too. While it could be slowed down it can't be stopped.
I guess if you were trying to make the Bangle last multiple months between charges - or maybe set it up to be solar powered or something then turning off the accelerometer and polling would be handy, but I think for most people the difference in power usage wouldn't really be noticeable.