Precisely. There's an engineering trade off between processing power, display size, resolution, brightness, and battery life. I don't think battery life has eve

Precisely. There's an engineering trade off between processing power, display size, resolution, brightness, and battery life. I don't think battery life has ever been the feature that sells gadgets. I read somewhere that SJ set the bar for iPad battery life at ~10 hours, and I think that set consumer expectations across the industry. Think of the iPad 3: it got thicker and heavier, in order to maintain battery life when faced with the retina screen. My hypothesis: For each device category, there is an "accepted" battery life that new devices must meet. Beyond that, what sells better: a 15% boost in speed or in battery life? When people stop using performance benchmarks and start using battery life, then companies may take notice. Until then, resign yourself to 1-2 days of battery on a smartphone.