A typical battery-powered IoT device like the Ring video doorbell will last ~2 months on a ~6000mAh ~3.3v battery. An average power draw of about 14 milliwatts.
This is quite low - a power LED can use more than 14 milliwatts. Of course some products have power consumption even lower than that, right down to the tens-of-microwatts level.
Meanwhile a raspberry pi, when idle, consumes ~3 watts [1]. That's 200x more than the video doorbell.
Getting the power consumption down requires (a) that your hardware draws very little power when it's in sleep mode, and (b) that it spends as much time as possible in that sleep mode. Hardware and software have to work together to achieve this, and the software changes can be extensive.
This is quite low - a power LED can use more than 14 milliwatts. Of course some products have power consumption even lower than that, right down to the tens-of-microwatts level.
Meanwhile a raspberry pi, when idle, consumes ~3 watts [1]. That's 200x more than the video doorbell.
Getting the power consumption down requires (a) that your hardware draws very little power when it's in sleep mode, and (b) that it spends as much time as possible in that sleep mode. Hardware and software have to work together to achieve this, and the software changes can be extensive.
[1] https://www.jeffgeerling.com/blog/2024/new-2gb-pi-5-has-33-s...