Compliant battery, has given new life to my 5S who now holds a charge a day in normal use, while the former is heated to discharged seen eye iphone died at 30% The tools provided for the operation are correct is not upscale but for an operation they do the job, however, is missing a clamp to hold the tiny screws, you also find a good tutorial on the net to guide you . To see how it evolves over time, I will update this review in case of problems.