How can I maximise the life of my iPad battery? Possible Duplicate:
  What is the best way to recharge an iPod Touch battery?  




Since the iPad battery cannot be replaced, how can I make sure that it lasts as long as possible, preferably years? E.g. should I always keep it charged, or always let the battery run to 0% before recharging?

Note: not the same as How can I make my iPad's battery last longer? which is about battery life during use.

Update: this question looks very much like: What is the best way to recharge an iPod Touch battery? (sorry, only found after posting this). This is slightly more general but perhaps is a duplicate?
According to Apple's website:


  Use Your iPad Regularly
  
  For proper reporting of the battery’s state of charge, be sure to go through at least one charge cycle per month (charging the battery to 100% and then completely running it down).