• The Bangle.Js looks like it could be fun - programmable in JavaScript and with GPS.

    BUT, I am unsure about the battery life.

    How long does it last in normal usage? Both with and without GPS (if that can be turned off)

  • Thr 2021.03.18

    'The Bangle.Js looks like it could be fun'

    YES @user126405 the Bangle and all the Espruino original boards are fun to tinker with!

    'How long does it last in normal usage?'

    Simple explanation for battery ampacity


    I found the specific answer for Bangle by taking a peek at the Bangle presentation page:


    Below the Power Consumption heading:

    Idle, accelerometer on 1.25Hz - 0.15mA (default if not moved)
    GPS on - 30mA

    From there I searched to the bottom of the page at the tutorial icons and selected 'Technical Information'


    Below the Features heading:

    350mAh battery, 1 week standby time

    How to calculate from those values? Total capacity 350mA or 0.350A

    At idle, 0.15mA or 0.000 150A are consumed when there is no movement. When GPS is
    enabled, 30mA or 0.030 000A are consumed. Using simple division, Total Capacity / Draw will provide the time in milliampere-hours. Dividing that by the number of hours in a day, yields the expected number of days.

    // * Idle *
    Total capacity 0.350 000A   /   0.000 150A = 2333 hrs
    2333 / 24 = 97 days

    Note that individual mileage may vary

    // * GPS When full on *
    Total capacity 0.350A   /   0.030A = 11.67 hrs

    Through your specific coding technique, GPS could be turned on and off to extend that value

    'Both with and without GPS (if that can be turned off)'

    See:    http://www.espruino.com/Reference#l_Bang­le_setGPSPower

    Also take a look at this ongoing discussion within thread:

    Bangle GPS Power management

    Post #21 Bar Graph



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