Battery did not switch off

Last night I tried to calibrate my battery since it has been two months. I used my computer for over two hours with adapter plugged in. I then proceeded to disconnect the adapter and let my Macbook Pro ( it was reading at 98%)run on battery only, overnight.I awoke six hours later to find the battery was down to
90% only. Can anyone suggest why it ran down to 90% and not to zero?

Since your MBP was running on battery and not actively being used, it went to sleep. You must use the MBP (keyboard / mouse input) until it goes to sleep because the battery is approaching empty. At that point you then let it sleep for 5 hours or until the white LED turns off.

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