The guide for the iPhone6 battery replacement needs to be revised. There are a couple of issues.
1) While the battery cover has two screws, they are different lengths. Since they are very small, it can be hard to see the difference (until one tries to screw the smaller one into the longer hole). The video needs to mention this.
2) The application of the adhesive strip if very different from what is mentioned. Also, there is a “one piece plastic” applique, and it is very unforgiving. The video should show this process in more detail.
I believe the attention to this detail would help folks correctly install their iPhone 6 batteries, and with the recent Apple disclosed battery problem, would continue to show that iFixit is very committed to the end-user.