Be mindful of your battery level and charge it as needed, so that you can readily use it when you need it the most. 

Here is what each color of the battery level indicator means: 

• Green: 100%
• Yellow: 20-99%
• Red: 0%-19%

To check your specific battery level, swipe down from the top of the screen and and you will see the battery percentage. Alternatively, you can go to Settings > Battery > Battery Level.