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.
Battery Technologies
The basics behind the batteries used in portable electronic devices: LiPo, NiMH, coin cells, and alkaline.
INA169 Breakout Board Hookup Guide
How to interface with the INA169 Breakout Board to measure current.
Hookup Guide for the SparkFun RedBoard Artemis Nano
Get started with the powerful RedBoard Artemis Nano
Power Delivery Board - USB-C (Qwiic) Hookup Guide
This guide will go over how to use the USB Type-C Power Delivery Board.