Battery charge doubt

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http://forums.androidcentral.com – Hey there, I have a Samsung Galaxy Note 10.1. Wen it comes to 15% of battery it says that it has low battery and to conect the charger, and it gves 2 options: OK and use battery. My doubts are: - When I say "OK" it meas that I'm going to conect the charger..? - When I press "use battery" it shows a graph which says discharging battery. The last time I pressed thi option the graph said 21 h remaining and now it says 17h... So when I say use battery it is discharging it PERMANENTLY? or how does this work...? - When it is charging under 15% does it damae the batter to (HowTos)