Apple targets for Apple Watch battery life revealed, A5-caliber CPU inside | 9to5Mac

Actual results may vary

"According to our sources, Apple opted to use a relatively powerful processor and high-quality screen for the Apple Watch, both of which contribute to significant power drain. Running a stripped-down version of iOS codenamed SkiHill, the Apple S1 chip inside the Apple Watch is surprisingly close in performance to the version of Apple’s A5 processor found inside the current-generation iPod touch, while the Retina-class color display is capable of updating at a fluid 60 frames per second.

Apple initially wanted the Apple Watch battery to provide roughly one full day of usage, mixing a comparatively small amount of active use with a larger amount of passive use. As of 2014, Apple wanted the Watch to provide roughly 2.5 to 4 hours of active application use versus 19 hours of combined active/passive use, 3 days of pure standby time, or 4 days if left in a sleeping mode. Sources, however, say that Apple will only likely achieve approximately 2-3 days in either the standby or low-power modes."

Apple targets for Apple Watch battery life revealed, A5-caliber CPU inside | 9to5Mac