Hi!
I was wondering what's the smallest battery I could use to power an Arduino board, specifically a nano.
I do not need very much power, just enough for a few buttons and a 7-segment display.
Whats the recommended method to do this? A coin cell, a 9V, etc
7-segment LED displays are very power hungry, and will consume most of the battery life. Coin cells won't work at all.
Post a link to your display and explain how it will be used.
Which Nano.
Which 7-segment display.
A coin cell and a 9volt smoke alarm battery are both weak current sources.
Leo..
Its a 4-digit 7-segment display, so it probably needs alot of power.
Roughly speaking, each segment of that display could consume about as much power as the Nano.
To estimate battery life, measure the current draw in mA (milliAmperes) of your project using a multimeter. Then for any given battery look up the capacity in mAh (milliAmpere hours).
The approximate formula for battery life is (hours) = (battery capacity in mAh)/(current draw in mA).
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