Battery life on S6 Edge+

A

AC Question

Just got the phone 3 days ago. Noticed 10 minutes after I unplugged that it lost 1% already. Had it on airplane mode overnight and it still lost 3% whereas my old Note 3 was usually either at 100 or 99% when I wake up after a full charge before bed. I read that the phone battery needs time to "adjust"? and it would improve in a week or 2? Am I just being paranoid or should I return it for another phone?