You might invest some time in sleep modes of the Arduino as only once per second the clock needs to be adjusted.
The rest of the time it can sleep.
So your battery will last longer (you might use some super capacitor)
You might invest some time in sleep modes of the Arduino as only once per second the clock needs to be adjusted.
The rest of the time it can sleep.
So your battery will last longer (you might use some super capacitor)