I love when people who take smaller or older processors or SoCs, and design custom low-level programs to do normal stuff on these tiny battery-friendly chips without overloading them, to make small portable devices or little Arduino devices that can do so much with so little.
So I've been looking into a way to design a mobile device that's like that, which gives me modern functionality with what you'd expect modern battery life to be, by sticking to the fundamentals that restricted us 25 years ago, and adding in the increased phone size, better battery technology and other modern advances, to curtail the power draw of 4g, minor internet use and whatsapp.
A device where the processor cannot be overclocked or overused by an app, and which can only run one app at a time.