What is the minimum voltage for a AA battery? (i.e. at what voltage is it dead) - Quora
AAA Batteries - Size, Chemistry Types and Replacements
Amazon.com: Low Voltage Power Solutions: Battery Holder – 3 AAA Battery Case with JST-PA Plug (Locking) – Triple AAA Battery Holder for Arduino, Lilypad Circuits, Cosplay, Costumes and Decorations - Set of 2 : Electronics
Energy Density of 9V battery vs. AA batteries - Bald Engineer