I do the same with all of my computers and iPad, iPhone, Android, Windows, I let the Batter go down to 50% and charge to 100%. This is why I still have the Original Batteries to all my products. I purchased the Original iPhone and charged it up and it worked just fine. Most people leave the iPhone, iPad, Nexus 7, all night and the Battery won't last. I would not let the Battery go down to zero, because you might loose some information if it were to run down to zero and shut itself off. This is what I recommend to all my Clients as well. Hope this answers your Question. Pete
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