I just started a new project about creating a sort of watch with an arduino nano 33 BLE. I would like it to work two days at least and I wanted to know what was the best way to power this nano 33 BLE, knowing that the battery must be little for the project. I actually just use the accelerometer and a SD card reader. Thank you for your time.
When you have little amounts of energy it is best to not waste any converting power. So powering the device directly without the onboard power regulator seems to be a good start.
Then look for some batteries that are the size you need and calculate how much energy you have on average over the 2 days you want the device to run. Then you can check the datasheet of all components and see whether your requirements are realistic.
Another option to find out whether your requirements are realistic is to see whether there are consumer products available that would fulfill these requirements. I am not sure there are many watch size products that can store data continuously to an SD card for two days. And most engineering companies have more resources available to create a product.
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Power hungry device.
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