u/parisfoundde4d

So my iphone 6s has been working really bad for the last couple days, first it was slow when the battery was less than 30%, now when the battery is less than 70% it just goes down to zero inmmediately. Today we found out that the battery was swollen, and i have to change it, my question is... is it worth changing the battery of a phone that already has like 8 years of use? the repair shop warned me that they could changed it, vut they would not guarantee that would make it work like before, or it could last a month and break again :/