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Battery life calc with on/off duty cycle

Discussion in 'Electronic Design' started by Joe G \(Home\), Oct 5, 2005.

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  1. Hi All,

    I would like to estimate the battery life of my Rx receiver which has an
    ON/OFF (wakeup / Stdby) duty cycle.

    1st I calculate the average current

    Current Av = [(Iwake * Twake) + (Istdby *Tstdby) ] / [Twake * Tstdby]

    Iwake is ON or wakeup current (mA)
    Twake is wake up period (s)
    Istdby is OFF or standby current (mA)
    Tstdby is standby period (s)

    When I know the average current I can work out the average battery life

    Hours = mAh / Current Av

    OK so far?

    Any other ways of looking at these calc's would be appreciate

  2. Ian Stirling

    Ian Stirling Guest

    Looks OK.
    Battery has N joules (power * time).
    Look at powers.

    Also, in real life, depending on battery chemistry, it may be inaccurate.
    How inaccurate depends on pulse rate, battery chemistry, internal resistance,
    If you're never discharging the battery faster than 1C, it's probably OK.
  3. Thanks Ian.

    I'll do some calc's with power and time.


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