An Applecare supervisor told me that: (1) I should not let my iPad 2 run out of power while the system running, because that crashes the software and apparently creates some risk. (2) I should never run the battery down to zero voltage. He said that iPad 2 batteries should never be completely discharged, and recommended NOT going below 20%. However, see this web page: Apple - Batteries - iPad Where, I quote, it says: "For proper reporting of the batteryâ€™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)." The advice I just quoted seems to encourage running the iPad charge down while the software is live, and definitely seems to suggest running the battery down to 0%. Who is right? The battery page, or my applecare supervisor?