Follow each step carefully.
Press and hold the power button for 3 seconds, then slide to power off.
Use a plastic opening tool to gently pry open the back cover starting from the bottom edge.
Locate the battery connector and gently lift it using a spudger.
Carefully lift the battery out of its compartment.
Place the new battery into the compartment, ensuring it fits snugly.
Press down on the battery connector until it clicks into place.
Align the back cover and press down until it snaps into place.
Press and hold the power button for 3 seconds to turn on the device.