Calibrating damage my battery

I have a fresh new ipad, and ive been using it for a week, and then i calibrating my battery by draining it until my ipad automatically off and then fully charged it uninterrupted after that, my battery drain faster than it used to be

For comparison,
Fresh new: 6hr standby without a percent loss
Now: 1hr standby, got 2% loss

What should i do? :( :(
Im soo sadddd

Six hours of standby without a loss of battery % is not normal. So now, your battery is calibrated properly and showing the true value.