People who just starting to work with an Arduino, often ask how long can it work on the battery power.
Typically, an Arduino Uno draws about 40-50 mA.
But what about workloads?
Let’s do an experiment.
I completed RadioShack® 3D LED Cube Hobby Kit, put it on an Arduino Uno and connect it to 9V 200mAh battery.
After an 1 hour 50 minutes light began to disappear at 0.1 seconds.
After next 5 minutes light began to appear to 0.1 seconds.
Cube stopped working completely in an hour.
200mAh / 2 h = 100 mA
Arduino Uno with 3D LED Cube takes 100 mA