Samsung Galaxy S4 User Manual page 24

2. Gently press down to secure the battery (2).
Removing the Battery
Grip the battery at the top end (3) and lift it up and out of the
battery compartment (4).
Removing Battery
Charging the Battery
Your device is powered by a rechargeable Li-ion battery. A wall
charger, which is used for charging the battery, is included with your
device. Use only approved batteries and chargers. Ask your local
Samsung dealer for further details.
Before using your device for the first time, you must fully charge the
battery. A discharged battery recharges fully in approximately 4
hours.
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Installing Battery