When I unboxed my all new j7 was awsm and all new features were also too good and my expirence for 1st Mont was good but in 2nd month my battery was damaged .means when my phone reaches to 50% then I was getting switched off .after that I went to service center for the issue , they told u will be replaced of old battery to new one.
But the took the time for 15 days after the I replace it the phone is working well! And now I updated to marshmallow software and also working too good