A:AnswerBest Buy will not replace a phone battery that I bring myself. They require that the battery be purchased and installed by Geek Squad for safety and warranty reasons.
A:AnswerI’m sure the battery in an iPhone 6 can be replaced. Contact the Geek Squad for the cost and time requirements. I had the battery changed on an iPhone 11 with different specs and process.
A:AnswerBest Buy has to go through the screen to get a new battery, so not only do you have a battery expense but also the screen expense. It is cheaper to get it this way.