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Power Management - Samsung EPIC 4G

Differences between a feature phone and the Samsung EPIC™ 4G that impact battery life

Differences between a feature phone and the Samsung EPIC 4G that can impact battery life

  • Samsung EPIC 4G has more radios to power (3G, 4G, Bluetooth, WiFi, GPS)
  • Samsung EPIC 4G has a larger screen than most typical feature phones
  • Samsung EPIC 4G has more capabilities than most typical feature phones 
    • Management of multiple e-mail accounts and syncing
    • WiFi access point
    • WiFi Router capability
    • 4G data
    • GPS
  • ccess to several 3rd party applications through the Market 
    • Applications and Processes running in the background
  • These new capabilities all require more power than previous feature phones.
  • Because of all these new wonderful capabilities and features it is up to the user to manage battery life experience.

Multiple radios use battery life even when not used

  • To improve battery life, turn off Bluetooth, GPS, 4G, WiFi, and WiFi Sprint Mobile Hotspot when not using them.

Program Monitor widget

  • Identifies running services no longer needed that could be ended to save battery life.  
    • Shortcut > Samsung Widgets  > Program Monitor

Live Wallpaper and backlight settings

  • Live Wallpaper uses significantly more battery than standard wallpapers when screen is on.
  • Ambient Light Sensor controls backlight brightness based on ambient lighting condition.  
    • Settings > Sound and Display > Brightness
  • Manual Control  
    • Use Power Control Widget to easily adjust backlight intensity with a simple touch

Tools to view battery usage

  • Before charging phone, view what has been using the battery during this charge cycle. 
    • Settings > About Phone > Battery use

E-mail Applications settings

  • E-mail settings allow you to set up peak and off-peak hours for e-mail sync on each e-mail account.  
    • Pop Account and Exchange Account 
      • Mail > Menu > Account Settings > Email check Frequency
    • Generally, less frequent syncing equals better battery life.
  • Manual Sync allows you to receive e-mails only when user chooses to.  
    • This can be optimal for battery life if user doesn’t necessarily need e-mails as quickly as they arrive. 
      • While in the e-mail client, sync by selecting Menu > Refresh.
  • Shorter polling frequencies (5 minute, 10 minute, 15 minute) can actually be worse for battery life than As Items Arrive, especially if user does not have high volumes of      e-mail.
  • Bottom line, e-mail synchronization settings can have significant impact to battery life and the ideal settings are going to vary by person.  
    • Try different configurations that achieve the best compromise between convenience and battery life.

Preloaded Applications:

  • There are several preloaded applications which update based on frequency settings:  
    • Feeds and Updates
  • These applications have a settings menu that can be accessed by using the Menu button while in the application.
  • In the settings menu there is an item called Auto Refresh.
  • In general, the less frequently these applications to update the better battery life can be attained.
  • If there are unused applications, for the best battery life experience configure the application to either not sync at all or to sync at the lowest frequency.  
    • The application or service can also be ended by going to the Program Monitor widget mentioned above.

Google Talk:

  • As soon as you sign up for the Google Market or Gmail with your Gmail account information, you are also signed in to the Google Talk instant messaging application.
  • The Talk application tracks the presence of Google Talk contacts in order to let you know who is available to instant message.  
    • Each presence change uses a small amount of power even if the Talk application is not open.
  • If there are numerous contacts who are changing presence throughout the day, all of these small impacts to the battery can add up to significantly shorten battery life.
  • If Talk is not used on the phone or if it is only      operational when the application is actually open, this extra battery consumption can be eliminated: 
    1. Go to Applications > Talk > Menu > More > Settings.
    2. Uncheck the automatically sign in box.
    3. Make sure to exit the application by going to Menu > More > and selecting Sign Out.  
      • Exiting the application by use of the back or home keys will not sign out and battery life will not be improved.
    4. To again receive Instant Messages through the Talk application, open the Talk application again and it will automatically sign in.


  • The 4G radio should only be turned on when the improved network speed is required for an application, such as YouTube, Web Browsing, or Sprint Mobile Hotspot.  
    • When not in use, its important to use the built-in 4G widget (preloaded on Home tile, left of center) to turn the 4G radio off.
  • If the 4G radio is on, but user is no longer in 4G coverage, the phone will be scanning in an attempt to reacquire the 4G network.
  • The battery can be significantly drained by the scanning processes, so if you know you will be out of 4G coverage for an extended period of time or if not acquiring a 4G signal as indicated in the task bar, it is important to turn the 4G radio off.
  • As with other radios, there are widgets that can be placed on the Home screen which allow you to turn 4G radio on and off.
  • Even when in 4G markets, particularly when mobile, user may be going in and out of 4G coverage.  
    • If it is noticed there is no 4G signal at any time, turning off the 4G radio will save significant battery life.
    • Turn it back on to check for 4G coverage when back in 4G coverage.
  • To check for the latest 4G coverage, go to

3rd Party Applications:

  • Be especially cautious with all 3rd party applications download from the market place.  
    • Often, these applications have not been designed with battery life in mind.
    • Many of these applications significantly impact battery life and quite often they remain running after exiting the application.
    • It’s important to understand the behavior of all downloaded applications.  
  • Know how to close the application so that it does not continue running  
    • Often via the Menu key while in the application.
  • Learn how to use the running services application or other 3rd party task managers to end applications that are still running but no longer needed
  • If the applications synchronize data, make sure to optimize synchronization settings for improved battery life.

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