deʃhipuWe have talked a little bit about the choice of batteries before in terms of the use cases, practicality and environment. But what if you need to this device to last longer than the two or three days you would normally get, and don't want to have to swap the batteries?
Well, turns out that using a cutout in the PCB in place of a regular battery holder has an unexpected advantage — it fits more kinds of batteries! Instead of your regular CR2032 cell you can fit a fat CR2450 cell in there, and it still works!
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The question is how long this device will last. I want it to work longer than my laptop, gameboy or any other game console.
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why not 0-24V battery?
stepper up-down from 0 to 24V?
have 18650 its ok, have 2 * AA no problem, have poverbank?
lipo and natural battery is not only one options
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Because that would add a lot to the cost of the components and assembly of the board. Right now the whole power circuit when battery is in use consists of just two capacitors and the internal 1.2V regulator inside the SAMD21 chip. I had to add an external 3.3V regulator for powering from USB, since I discovered that using the device without a battery is an important use case. Adding a buck-boost converter as you suggest would easily triple the cost of the whole device.
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