I decided to test my N4's battery out today to see how long it could truly last, as most day's it's on airplane mode not being used for 7 hours. I'm running stock 4.2.2. Here are some screenshots to give you an idea of how long it can last. They include the main battery information, the battery discharge graph, my screen time, the screen brightness (constant throughout usage), my data usage on Wi-Fi (didn't use mobile data today), and two screenshots of RAM usage by user and system processes, respectively.