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There aren't a whole lot of power management features available in the hardware, the SoC just wasn't designed for mobile/battery use. About all you can do is disable USB/ethernet/HDMI if not needed for your use case, or drop the CPU/GPU clocks.

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It is relatively low power, in the ballpark of a mobile phone. Running headless the Pi3 consumes 4-5W with an out of the box Ubuntu install, about 9W with the 7" screen, and after shutdown it remains on at about 2W. The iPhone SE takes about 9W while charging and 4W fully charged with the screen on. Numbers aren't exact, read out from a Jackery display and it's been a few months. I think the Pi4 8GB was about 1W more than the Pi3.

My Lenovo t460 draws 4-5w while idle with Wi-Fi and lcd goin… 4-5w is a decent draw for headless

Do you know why does it still consume half of the power (2w out of the 4-5w) after shutdown?

The power circuit in the Pi isn't super-efficient.

For the RPi0W, JG has some hacks: https://www.jeffgeerling.com/blogs/jeff-geerling/raspberry-p...

tl;dr you can drop power consumption to between 80-100 mA at idle if you don't need to use HDMI. And like 75-80 mA if you also disable WiFi/BT completely, as well as the tiny onboard power/activity LED.

But honestly, if you're going to that length and really need good battery life, maybe consider a fast microcontroller ;)

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