After nearly three years of hard use, my iPhone 6 Plus rarely made it the whole day on one charge. I ordered the battery and repair kit (highly recommended), and followed the step-by-step instructions. The only difficulty was that my three adhesive strips did not pull out. I had to scrape them off the back case. Apparently they had melted by the battery heat. There was a little panic moment when I had to forcefully peal away the battery from the back case, but once I did the rest came together smoothly. Now my iPhone is like new and by the end of the day I still have over 50% juice left! Thank you for another great repair guide!
Buy the repair kit, watch the video, and follow the step-by-step guide.