What are the performance implications of disabling the lock-screen?
<p>I am working on a timer application (it's my first app to try and learn the ropes).  While the timer is running, I want to offer the user the ability to prevent the screen from locking.</p>

<p>Since the screen is always displaying something (and refreshing the clock every second), what would the performance penalty be for doing this? The only things active on the screen are the timer (black background with just the running time) and "split" and "stop" buttons?  I am mostly concerned with the battery life of the phone; e.g. if this were a long-running timer job (let's say long-distance running with split times).</p>
