iPhone 13 mini battery life

Thank you Rudegar. The question was about battery performance, asked about a year ago. Yes I have read those articles. I have only had this phone for four months and battery life has been disappointing. As for replacing batteries when down to 80 % , that is a must. My old phone is at that stage and it will not hold a charge for a few hours even idle. I read before buying this phone how good battery performance was supposed to be but I saw an article dated October 2021 referring to battery performance shortcomings. That before the iPhone 13 line had been out a month.