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|ync
Member
(12-01-2013, 10:18 AM)
From a 1000 mAh battery and 6 hour battery life you can calculate an average current draw of

Code:

1000 mAh / 6 h = 166.7 mA
Given the measurement of 0.08 A with led vs 0.03-0.04 A without led we get the power draw of the led

Code:

0.08 A - 0.035 A = 0.045 A = 45 mA
(The fact that you reported the values in A with two decimal places suggests that maybe you had the multimeter on A scale rather than mA scale. You get more accurate measurements if you select the right scale for the signal your are measuring)

Subtracting the led current from the total current gives the current drawn by the rest of the controller

Code:

166.7 mA - 45 mA = 121.7 mA
Finally, you can calculate the expected battery life without the led

Code:

1000 mAh / 121.7 mA = 8.2 h
And so theoretically you could get an extra two hours or so by disabling the led. Have you had a chance to actually play with your led disabled controller and see how long it lasts under normal use?
Last edited by |ync; 12-01-2013 at 10:22 AM.