I'm converting videos for my new iPod Classic 80 GB and I want to know which format uses less battery life. H.264 creates smaller files which theoretically might mean it accesses the disk less and saves battery, but H.264 is probably (?) a more complex codec which theoretically might mean more processor intensive decoding and thus requires greater battery usage. So at the same visual quality, does playback of H.264 or MPEG-4 take less battery? (I'm not too concerned about video file size on my 80 GB iPod.) I'm using iSquint to convert my videos and I want to know if it's worth using the H.264 option which takes much longer.