I am looking at bringing the system power down to extend battery life. The power breakdown in idle mode is as follows:

The battery I have chosen has a capacity of 150mAh @ 3.7V. The system runs at 3.3V so energy rating of the batter at 3.3V is 150*(3.7/3.3) = 168mAh @ 3.3V. This means the standby time is 168/11.66 = 14.4 hours. That's a full day of standby time!!!

I think we can push the sleep duty cycle longer than 50% to save even more power. Probably by as much as 80% duty.

Now to measure the full system during streaming mode:

Here, I put the whole system into stream mode and measure the supply current (measured on the battery voltage rail).

Wow, 4 hours of talk time! There must be something missing... there is, the speaker. The speaker driver can source as much as 120mA when driving a lout signal. Therefore The talk time is limited to more like 1 hour of receiving.

Summary:

12+ hours of standby

1+ hour of talk time

Actually, not too far off from an old Nokia bar phone...