How do I choose an MCU for a battery-powered system design?

What are some guidelines we need to follow when selecting a microcontroller for an IoT device that runs on battery. What should be my consideration. Am currently starting a project on a battery powered device. Thanks.
Solution:
Sleep modes, Power-down modes, average static power consumption, current consumption per MHz, MCU grade = manufacturers help you with naming—ultra-low power in the datasheet would ring a bell, wouldn't it?...
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Solution
Petr Dvořák
Petr Dvořák8mo ago
Sleep modes, Power-down modes, average static power consumption, current consumption per MHz, MCU grade = manufacturers help you with naming—ultra-low power in the datasheet would ring a bell, wouldn't it?
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