Nano's cache and how it effects battery life

I received a nano from Christmas and have been disappointed in its battery life. I don't get anywhere near 14 hours of play time. I'm sure the cache and its refresh rate have an effect upon battery life. What is the best playing "mode" to get optimum battery life? Is the cache a "look ahead" cache that loads up by xnumber of sequential tunes? If so, then how are the tunes stored in the flash? Are they stored in cache based upon their "input" date or is it alphabetized?

See Tips and tricks to get the most out of your iPod's battery and How to accurately determine your iPod battery life.
The following was copied from About iPod Batteries.
Maximum Battery Life: iPod can play up to 20 hours, iPod nano can play up to 14 hours and iPod shuffle can play up to 12 hours on a full charge at original capacity. Apple runs a number of tests for battery life using songs encoded in various formats, including MP3, AAC and songs purchased from the iTunes Music Store. The songs are played continuously through a playlist without interruption, with backlight and equalizer off, using factory default settings.
Doing anything that accesses the hard drive or flash drive with a Nano continuously uses more battery including the backlight, searching for/fast forwarding thru available music, viewing photos, playing games, accessing calendar entries, etc., etc.

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