15 minutos - 1 hora
My iPhone 5's battery has been atrocious for the last few months. I basically could not go anywhere without leaving the house with a 100% charge. If I did, it wouldn't be long before I had a dead phone.
The hardest part is working with the internal screws. They so tiny, the smallest screws I've ever seen. It took some patience and steady hands. Prying the battery was the second hardest part. The adhesive is very sticky, so it took some time. Overall, it took me 15 minutes.
Be patient and be careful to not lose those tiny screws. I found that the larger screwdriver worked for all the different sized screws and did not use the smaller one at all.