&gt; The reason your phone gets all day battery life is because the kernel was designed to run well on an i386<p>This is false. The reason your phone has the battery life it does is because the OS and libraries and applications have been written to allow the hardware of the phone to drop in to lower power states as much as possible. Unless the language you have written your OS in has some bizarre requirement to wake up all the hardware constantly then the language doesn&#x27;t matter a ton when it comes to battery life. What matters is writing programs that wakeup the hardware as infrequently as possible.