I bought refurbished iPhone xs 5 days ago and the battery usage went down by 5% in 3 days from 100 to 95%

It's only been 3 days and I don't even use more than 2 hours daily but the battery went down by 5% in this short amount of time and on 2nd day I left the phone at the desk with 35% battery but I checked in the morning it was low and turned off but on day 4 the battery seems fine it wasn't draining that fast while using social media apps its when I saw the battery usage went down by 5% and i instantly report to seller he ready for replacement but before that I checked battery screen time by myself it gave me 5 hours 27 mins of average use I will also uploading some screenshots and It didn't shut down when I left on the desk overnight on day 4 I left it at 100% and it was 100% in the morning.

Is this normal behavior by refurbished phones? all I wanted to know should I replace my phone or not because the replacement can have more problems then this phone's. The only problem is battery which seems alright now but I think the battery still draining little faster than normal I was just using Instagram for messaging but battery dropped from 85% to 74% in 25-30 mins in which time I was constantly turning off the display

so please help me should I replace my phone or keep this phone? is 5% decrease in phone's battery bad? because I couldn't find any similar case where it happened this fast anywhere and I don't know where else I can ask other than this so please someone help me what should I do