Apple Quick Q about the Nano

I got a Nano today, late christmas present, and i hooked it up a few times to add music. when i connect it via usb though, am i using a charge cycle each time? i know the lithium battery only gives me like 300 to 500 or something, so if i am i want to conserve them. am i sending my nano to a early grave? sry its a noob question, next time ill more thuroughly.

 

it tops off the battery and trickle charges it to keep it at steady level. dont worry, the battery will last a long long time.

 

ok good, i dont want it crapping out in a year. i guess i could buy a new batt on ebay, but meh, its better to make this one last.