Remove battery by grabbing the sides and pulling upward.
If battery was malfunctioning due to age or corrosion, there may be battery acid residue on the battery and the back of the phone. Wear gloves in order to prevent skin irritation.
Remove back cover by taking out the four, five point star screws indicated in the picture. A 1.5mm flathead screwdriver can be used to remove the screws.
Once all screws are removed the case will easily lift off.