Do you buy new Phone or change Battery?

Honestly. I have Samsung j6 and i have it for like 4-5 years. I planned to buy a new from Wish or overall from the China as my dad did. Very cheap I have to say. But I wouldnt mind to buy new battery for my current mobile as I like it and Iam very used to it after the years of repairing it and forever reinstalling Custom OS XD.