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 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)."
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?