Espruino JavaScript
Battery Life #4852
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Posted at 2022-05-16 by Alessandro How long did you keep it in charge? Posted at 2022-05-16 by @gfwilliams Also worth adding - are you using it until the battery level is 0, or until it turns off? Because it can be in some watches that the battery level indicator isn't calibrated right - but recalibrating it with the 2v13 firmware is pretty straightforward Posted at 2022-05-16 by user143850
Based on gadgetbridge it took 2h30m to charge,i stoped charging exactly on 100
It turned off on 0 Posted at 2022-05-17 by user143850 It got to 0 and device switched off today aprox hour ago. Attaching screen from gadgetbridge Attachments: Posted at 2022-05-17 by HughB Ooooo. Looks like the battery plot works in GadgetBridge now. Posted at 2022-05-18 by @gfwilliams Please could you leave the Bangle charging overnight and see if that helps? When charging the battery voltage reads higher, so a 100% battery reading doesn't mean it's fully done charging.... Also what kind of battery life do you get with the watch just sitting with no bluetooth connection and not worn? I know the 'LCD Wake on Twist' setting can be overly sensitive for some people, and the LCD backlight draws a bunch of power (it'll flatten the battery in 12 hours) so if it's coming on a lot for you then that'll have a big effect Posted at 2022-05-26 by user143850 I have kept it overnight, same issue gadget worked for 3 days and died. LCD Wake does not seem to be an issue at least i have not noticed this happening a lot. I am currently Re-charging and will try idle with no Bluetooth and post the results. I understand that 4 weeks is not something that i have to expect, what is average daily battery usage in general scenarios? (Meaning no development just watch and Gadgetbridge for notifications. ) Posted at 2022-05-26 by @gfwilliams You could definitely expect to get as little as 3 days with certain apps installed and settings tweaked, but if the device really has been reset to just the default apps, plus Gadgetbridge, and no other settings were tweaked then it does seem like there's an issue. How long have you had the Bangle? Has it always been like this? Maybe others can chip in here with their experience of Gadgetbridge battery life? Posted at 2022-05-26 by d3nd3-o0 Use the recalibrate feature in settings menu, don't stop at 100, then see if that helps. Posted at 2022-05-26 by @gfwilliams @d3nd3-o0 I'm afraid the battery percentage reported won't affect how much the battery can charge, or when it shuts off, so I don't think it'll help in this case Posted at 2022-05-26 by user143850
I have the device for few weeks and it has been like this from day 1. Posted at 2022-05-30 by user143850 I did one more factory reset, this time haven't installed any apps, no connections were done and kept the device idle on the table. Question is how do i check percentage of battery? p.s. Posted at 2022-05-30 by user140377 The easiest to find battery percentage is probably to use the https://banglejs.com/apps/?id=widbatpc widget Posted at 2022-05-30 by user143850 I know but than i have to connect my device to pc/mobile which will ruin debuging process. Even if it remove connection after installing app not a fact that following app is optimized enough to not have impact on final result. Posted at 2022-06-07 by @gfwilliams
Yes, it should do. Only thing that'd stop it is if devices kept connecting to Bluetooth (but you could even disable bluetooth in settings)
You still have the battery indicator showing in the top right? It's not an exact percentage, but then the percentage you get reported is only maybe 10% accurate anyway. Posted at 2022-06-11 by dc959 Just going to chime in here, I have also had 3 days battery life since day 1, I charge the watch for at least an hour more than when it’s at 100%, normally about 4 hours and then it dies roughly 3 days after the charge. My watch has been reset a couple times now and the settings are all default, only additional apps I have loaded is the iOS integration, messages and my seiko watch face which I assume the watch face shouldn’t be draining too much battery as it’s using drawImages. I don’t have heart rate on or gps, I actually had heart rate on every 10 minutes at one point and had the exact same battery life then as I do with it off and I have made sure it isn’t still activating. I have charged the watch for about 6 hours previously to make sure it was definitely fully charged and found no difference in battery life, 3 days seems to be all I get. I probably have the watch go off to about 20 to 30 notifications a day Posted at 2022-06-11 by Alessandro
If the clock face updates every second then it'll drain a lot of battery. Do you turn off the watch at night? Many clock faces update seconds only when screen is unlocked to preserve battery. Posted at 2022-06-11 by dc959 I don’t turn the watch off at night no. I might try updating the watch face to only show seconds when the screen is unlocked and see how that affects my battery life. I assumed the drain shouldn’t have been too bad with drawImages as that should only be updating the screen with the pixels required, although I’m not 100% on whether that’s specifically the pixels that change or done by segments of the screen getting updated. I might also have a play with when the screen unlocks on the watch as I find sometimes it triggers when I don’t want it to then when I want it to it doesn’t trigger Posted at 2022-06-11 by @halemmerich I think waking up in itself is expensive, regardless of what is actually done after. So refreshes every second are 60 times as expensive as doing that only every minute, in regard to the cost of waking the processor from sleep. Drawing to the screen is relatively slow and I suspect it keeps the processor awake that whole time. Posted at 2022-06-14 by @gfwilliams
Please don't do this! As long as the clock face just updates every minute, having it on over night shouldn't be a big deal. But yes, updating once a second can be a big draw. If you're just updating the seconds digits on a digital clock it won't be too bad but very few clock faces do this - they usually redraw everything
Is yours this app? https://banglejs.com/apps/?id=seiko-5actus Because it seems you clear the screen (twice), and then redraw everything (including all widgets) once a second: https://github.com/espruino/BangleApps/blob/master/apps/seiko-5actus/app.js#L162-L165 So actually I'd say 3 days life is probably not a huge surprise from that... You could use some code like this though, and ensure you redraw just the area around the second hand (and where it was) and it would probably have a pretty drastic effect: https://github.com/espruino/BangleApps/blob/master/apps/analogimgclk/app.js#L41-L95 Posted at 2022-06-14 by dc959 That is correct and I see now where I’ve gone wrong, my intention was to draw the background once and then not have it redraw and only redraw the hands, not sure why I put it in the display refresh loop, was a bit silly of me. I’ll have to update that code to not redraw everything like that and see what happens, but I’d agree that my watch face is most definitely my issue of only getting 3 days battery life. That analogimgclk has some nice code in it, I’ll have to have a proper look at how it’s handling the images and implement something similar into mine. I’ll have to find some time this week to sit down and rewrite a chunk of that code as there’s a few things I can see I want to change and optimise in it Posted at 2022-06-14 by @gfwilliams Great, thanks! At the end of the day it doesn't really matter though if it works for you. But for anyone with battery life issues, check what apps you have installed first! Bangle.js is intentionally very flexible and open but that does mean that apps can have a huge effect on your experience of the device as a whole. Posted at 2022-06-14 by @fanoush
Not really. The CPU needs to wake up all the time to keep Bluetooth protocol happy so waking/sleeping is fast and is not an issue. nrf52 can last months from coin battery sending advertising packets every few hundred of milliseconds which wakes up CPU and radio for every packet. So it definitely depends on what is actually done after waking and for how long. The power is drawn by CPU being busy running code or by some other hardware which is not put to sleep . Bangle running any JS code from flash storage makes CPU and SPI flash chip busy. Drawing to display keeps CPU and display busy. Posted at 2022-06-15 by rigrig
So would it make sense to load redrawing code into Posted at 2022-06-15 by @fanoush It could make sense. However I'm not sure how much it would save. SPI flash can momentarily draw like 15mA (see e.g. table on page 83 for similar chip here https://www.winbond.com/resource-files/w25q128fv%20rev.m%2005132016%20kms.pdf#page=83 ) while the CPU being 100% busy draws like 5mA (table here https://infocenter.nordicsemi.com/topic/ps_nrf52840/_tmp/nrf52840/autodita/CURRENT/parameters.i_cpu.html?cp=4_0_0_4_1_0_2 ) however there is some cache buffer implemented for reading JS data from SPI flash so it is not read all the time and may actually sleep most of the time with short bursts of activity. Interpreting JS code makes the CPU busy almost all the time as long as your redrawing code runs so while CPU draws less than SPI flash it may consume majority of the power. There is also internal flash directly on the nrf52 chip, bangle 2 has like 500KB free, would be interesting to have test with some longer busy looping JS code running from storage how much loading code from external SPI would add vs running same code from internal flash (or from Posted at 2022-06-15 by @gfwilliams
True - it would help power usage (and speed) Posted at 2022-06-19 by HughB But also the screen draws power when it is redrawn, the larger the area redrawn the more power is required? Posted at 2022-06-20 by @fanoush Screen data transfer over SPI of course draws something too but I'd guess it is minimal when compared to CPU usage needed for typical javascript redraw routine (as the javascript interpreter may need to run thousands of cycles per each trivial JS line). Tens or hundreds of milliseconds of 100% cpu usage at ~4mA is much more than few miliseconds of SPI transfer and LCD screen pixel changes. As an example see this http://forum.espruino.com/conversations/376504/#16554635 - burning 15ms of cpu for base64 decoding and heatshrink decompression over and over again probably draws much more than pushing pixels to the display in the end. But still maybe those 15 ms per icon are not worth optimizing if drawn only once per minute. |
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Posted at 2022-05-16 by user143850
Hello,
I think there is something wrong with the battery in my device:
I did factory reset, settings are default, additional apps gadgetbridge, GB debug.
Before factory reset gadget was working 2 days only.
after reset: device was fully charged on 14.05.04 22:00 today 16.05.04 16:14 current battery level 51% is this normal ?
p.s.
Gadgetbridge usage i minimal, default settings always connected notifications are filtered and have received 15 notifications during this period.
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