I came across this very nice article which documents steps taken to reduce the power usage on the ATtiny4 used in the iCufflinks.

The process managed to shave off about 315 μA, which boosts battery life quite a bit:

The overall effect this has on the product is that the 24 hour time between battery changes can be upped to 38 hours. That is a pretty good power savings for the day.

It’d be great if this was incorporated into the products.

I do disagree on one thing though, which is cutting away the data points used for the PWM. Unless the output was measured with an oscilloscope and produces the same breathing pattern, I would very much keep the data since the additional space gained is not used for anything else.

If you don’t know what iCufflinks are, watch the video below.