Nokia India — nokia 3 issue with battery not charging to full 100%

Address:

Mysore, Karnataka, 570023

My nokia 3 under warranty is not charging to fill 100%. It charges to 70% then it takes each hr to charge 1%.
To reaches to 73% from there it remains the same. At 73% it shows still requires 5 hrs to charge to full.
This is not the first time. I had issues regarding sudden black out of the set. I had raised these complaints in the past.
I need immediate results of else will approach cusumer court to resolve this issue.