The Samsung Galaxy S4 has a removable battery. It is easier to troubleshoot many of the problems especially software glitches, which requires the owners to do a soft reset. The following steps will guide you through removing and/or inserting the battery in your GS4.
1. Turn the phone off.
2. Find the notch at the back cover.
3. Pry up the notch to remove the back cover.
4. Locate the notch at the bottom of the compartment and pry it up to remove the battery.
5. To insert the battery, make sure gold contacts are aligned.
6. Replace the back cover.