My questions though is how to determine the equivalent continuous current draw based off of a known current draw for a known time at a known interval. The display takes 2 seconds to update and it will need to be updated once every 10-15 minutes. And the display specifies that it draws 20mA while updating.
I know if you take a usually battery with say a 10Ah rating that means you can pull 1 amp continuous for 10 hours, but I am not sure how to calculate usage time with periodic current usage bursts.
The actual calculation is integration - summing the product of current and time,
to give total charge. Typically you just need to do this for one cycle and then
divide charge-per-cycle by time-per-cycle to get average current.
Excellent articles about current draw from coin cell batteries and maximizing efficiency; thanks!
The actual calculation is integration
Ok just as an exercise in learning some thing here:
So if I take the integral of current with respect to time from t = 0 to t = 2 seconds i would get the charge used over that 2 second interval correct? If so I used .02 as my current and got a charge of 40 coulombs.
And so if I take that 40 and divide it by 2 I would get back to where I started at 20mA correct?
Interesting to work out the math but I'm failing to see how I could use that to get the answer I achieved by using what Keith said in which I took (220mAh/20mA) and divided that by (2/600) to achieve a total of 3300 hours or 137 days.