Reducing Arduino Power Consumption
Contributors:
Alex the Giant
Alex the Giant 
Resources and Going Further
More information on low-power modes and options can be found in the datasheet for the 328P.
For more power-related fun, check out the following SparkFun tutorials.
Uh-Oh Battery Level Indicator Hookup Guide
Learn how to assemble and use the TL431 in the Uh-Oh Battery Level Indicator Kit.
LTC4150 Coulomb Counter Hookup Guide
A "Coulomb Counter" is like a gas gauge for your battery. Here's how to use it.
Dialog ULP WiFi DA16200 R3 Shield Hookup Guide
Add WiFi to your project with this hookup guide for our Dialog's Ultra Low Power DA16200 R3 shield!
Single Cell LiPo Battery Care
This tutorial will go over how to safely charge, connect, disconnect, reinforcing the cables, and handle single cell LiPo batteries.