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Topic: Tiny battery to power Arduino Nano (Read 135 times) previous topic - next topic


I have an Arduino Nano that needs to be powered by a battery that can fit inside a 29mm tube. I have a barometer connected with the Arduino and the entire system only needs to operate for around 30 seconds. Any suggestions for such a battery?

Thanks, harry


Aug 14, 2019, 06:40 pm Last Edit: Aug 14, 2019, 06:41 pm by jremington
An Arduino Pro Mini or clone (3.3V, 8 MHz) would be a much better choice, as you can remove the regulator, the power LED and have the equivalent of a "bare bones" processor.

Using sleep modes, it and a barometer module could run for years on a coin cell. Excellent low power tutorial here.


You can also use ATTINY85 and a small 3V Coin Cell Battery (no other components required).


Aug 15, 2019, 04:31 am Last Edit: Aug 15, 2019, 04:32 am by jremington
A decoupling capacitor is required, if you want your projects to work reliably.

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