Powering Arduino nano BLE through 3.3v pin with batteries

Official Hardware Nano Family Nano 33 BLE
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Hello everyone!
I own an Arduino nano BLE (not the sense version) and I am trying to power it with batteries, so I can put it into my mailbox. The goal is to change the batteries once (or less) per month. In the mean time Arduino connects to my RasPi via BLE and notifies me if I have received any actual mail.

I am mostly planning to follow this post where the user removed the powering through USB due to high power consumption and powered it straight through 3.3 pin.

The biggest problem I have is finding the correct batteries and protection board that would power the Arduino long enough and not be a risk to use.

Thank you very much for your help!

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This 3.3V step down switching regulator would be appropriate, is very efficient, and can be powered by any battery of higher voltage.

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If you do not care about the battery look at a SEPIC converter, it will buck or boost as needed. The reason I suggest is the battery will start at one voltage and as it is depleted the voltage will drop.

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Thank you very much for that suggestion. I will probably go with this. I will update the post once I figure out the complete setup!

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