Turn It Off: Hold down the Play button for a few seconds until the iPod turns off. Then use the lock button to keep it off until you want to use it again.
Kill the Clock: Prevent the clock from running by never setting it. This is tricky because when the clock is connected to your computer it automatically sets itself. So reset the iPod just before you disconnect it from your computer. To reset, press and hold "Menu" and "Play" until the Apple logo appears (5-10 sec.).
General Battery Tips: Charging your iPod more frequently is NOT bad. The type of batteries used in the iPod, Lithium-Ion Polyme, do NOT develop what is known as "memory effect". According to Sony, the manufacturer, this battery should be charged to its fullest when new, and should be charged as often as possible during the lifetime of the battery. The problem with this new battery starts when you let its charge drain to less than half. The specs for this battery describe a guaranteed battery life of 500 cycles, but each cycle equals a 50% drain from full charge. Sony does not recommend letting this battery completely drain before recharging it.