Chosen Solution

My Xperia Z1 power off because the charge is ended but on screen the software is still indicating 70% of battery. I think I should replace the battery… Can you explain me how?

Luca Mino follow the instructions from the service manual to remove the battery.==» Z1-Battery.pdf«== the last step has been omitted. It should be"remove the battery"

Follow this guide. You can use a hair dryer instead of heat gun, and dont heat the back cover too much.