First remove 2 screws on the bottom edge of the machine.
The screen of iPhone 5 allows for easy disassembly.
Remove the fixed screws on the back of the machine.
Lift the connectors from the battery and the main unit.
The iPhone 5 battery uses 3.8 V voltage, 5.45 Wh and 1440 mAh.
The video details how to remove the device, replace the battery for iPhone 5.