Amazon.com: CQRobot MicroUSB Battery Holder (3xAA), Can Hold 3 AA Batteries. Compatible with Arduino Controllers with Micro USB Interface. : Electronics
GitHub - EasySensors/easyPIRmultisensorsBox2: 2 AA battery powered PIR sensor. Based on the Atmel ATMega328P 8MH) microcontroller with RFM 69 CW radio on board
Rechargeable Batteries Aaa Aa 1.2v 3000mah | Rechargeable Nimh Battery Aa 1.2v - 1.2v - Aliexpress
Vehicle detection using ATmega328p - Project Guidance - Arduino Forum
Battery based atmega328p sensor (no SMD) | OpenHardware.io - Enables Open Source Hardware Innovation
Arduino: Basic circuit, bootloader and programming - ElectroSoftCloud
arduino - How can I get my atmega328 to run for a year on batteries? - Electrical Engineering Stack Exchange
low power - atmega328p measuring supply battery voltage - Electrical Engineering Stack Exchange
Arduino Uno: Using Your ATMega328p-u As Stand-alone - CodeProject
Arduino pro mini @ 1MHz - 1.8V
Make Your Own Remote Temperature/Humidity Sensor - UDOO Projects
Atmel ATmega328P with UNO bootloader incl. crystal kit - AT328KIT
Amazon.com: Plantmate AA Battery Spring Contact Nickeling Plated 12 Pieces (3-Set Pack) : Electronics
atmega328 wont power on unless it has had power in last 7 seconds. - General Electronics - Arduino Forum
Generic AA Batteries Holder with DC2.1 Power Jack for Arduino : Amazon.in: Electronics