Aduino battery backup ( not rechargeable ) - General Electronics - Arduino Forum
power supply - Arduino PSU with battery backup (SLA) and mains/battery monitoring - Electrical Engineering Stack Exchange
BATTERY BACKUP with charging (will not trigger arduino reset) - Product Design - Arduino Forum
Overview | Adafruit PowerBoost 500 Shield | Adafruit Learning System
Recorder Data Logger Module Logging Shield XD-05 For Arduino UNO SD Ca – ImportedElectronics.com
Arduino backup battery power (UPS behavior) ? - General Electronics - Arduino Forum
DS1307 RTC Module I2C Real Time Clock for Arduino Uno,Rasppberry Pi,8051,PIC,AVR etc Microcontroller Board | Timer Counter and Clock Electronic Kit With 8-Pin DIP IC & Battery Backup | MY TechnoCare -