How iPad Air gives almost same battery back up even with less battery pack? Sorry if it sounds like a noob question, earlier iPads have 42.5Wh battery pack and gives 10 hours of battery. But new iPad Air has only 32.5Wh battery, but it also gives same amount of battery backup that too with a more powerful processor and graphics. How so?
A combination of more efficient backlighting with fewer elements, along with reduced silicon fabrication size combined with a switch to the new more efficient 64bit architecture means that the device simply runs on less power, allowing a smaller battery to be used while maintaining the customary 10 hours usage.