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So I have quite a few ideas for wearable devices using Arduino boards (mainly the Nano and the Micro clones). With that in mind, I want to determine what the best way to power an Arduino is, with compactness in mind (and cost too, of course). One single button cell battery does not supply enough power to the Arduino to power it properly. I can use these 2x button cell battery holders (6v) but they mainly ship only from China and, for some reason, are relatively expensive ($15 for 6 of them).

Does anyone know of a better and cheaper way of powering these Arduino boards, with wear-ability in mind?

Thanks! :)

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    The best solutions are probably not to run at 5v. In the ATmega you have a processor which at appropriate clock can match the range of several battery chemistries, choosing one or two cells appropriately.
    – Chris Stratton
    Apr 8, 2018 at 3:08

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I made a torch locator which looks like this:

Torch locator

That was powered by a single button cell. The actual processor is an ATtiny85. As you can see it isn't much bigger or heavier than the coin cell.

You can run the Atmega328P (and the ATtiny) at 3V (as from that battery) provided you slow them down to 8 MHz. That is quite easy to achieve, and then you don't need an external crystal as the Atmega328P has an inbuilt oscillator which can drive it at that frequency (as does the ATtiny).

I have a page about power saving which might help you with your design.

A possible alternative is a single LiPo cell (nominally 3.7V) which, if you get a small one, should be quite light.

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