The hurdles to better battery life in modern devices are both technical, in terms of power consumption, and physical, as limited by space available. Apple's upcoming "iPhone 8" is rumored to address both of those issues, potentially allowing for longer battery life than ever.
Doing more with less
Rumors suggest this year's flagship "iPhone 8" will boast a large 2,700 mAh battery, on par with the high-end 5.5-inch iPhone 7 Plus.
For comparison, the iPhone 7 has a 1,960 mAh capacity battery, while the iPhone 7 Plus has 2,900 mAh.
Where would Apple find the space to fit such a large battery in a device expected to have a 5.2-inch edge-to-edge screen? It's rumored that Apple will accomplish this by shrinking the parts inside of its premium-priced handset, rumored to debut later this year in September.
Efficiency, efficiency, efficiency
According to KGI Securities analyst Ming-Chi Kuo, Apple plans to use a stacked logic board, called a substrate-like PCB mainboard, to allow more space inside of the "iPhone 8" chassis.
Shrinking the size of the mainboard also has the added benefit of allowing for greater energy efficiency. The one-two punch of a larger battery and more efficient parts has led Kuo to predict that the "iPhone 8" could boast even better battery life than the iPhone 7 Plus. Read more..