[Nokia Lumia 920] Thresher:
I am not totally sure on that because there isn't much of a way to test it, although I do know that with my Google Exchange that if I leave that to check as Items Arrive it is far more power draining than checking at intervals.

---------- Post added at 08:53 AM ---------- Previous post was at 08:51 AM ----------

I never found anyone selling actual OEM Genuine batteries and Nokia claims that no one can. So I contacted their support about a battery replacement and they sent this back to me, I think most of us know all these battery saving work arounds but I figured i would post it anyway.

"Thank you for emailing Nokia Care.

We understand that you would like to have the battery of your Nokia Lumia 920 replaced with an original Nokia battery. Please be advised that we do not recommend the customers to open the phone to replace the battery as this will void the warranty. Nevertheless, before requesting to have the battery replaced, we would suggest that you check first the troubleshooting steps we have provided below:

You can set your phone to automatically save power when the battery charge level is low. To check the battery status, and switch battery saver mode on, go to Settings > battery saver. To choose when you want battery saver mode to be activated, switch Battery saver toggle to On and tap advanced. Please note that when Battery Saver is on, your phone will no longer automatically receive email and calendar updates, update some Live Tiles and allow apps to run in the background.

If you are listening to music or otherwise using your phone, but do not want to make or receive calls, switch airplane (flight) mode on under the Settings menu.

To save battery power, note the following:

Background apps

1. Set your phone to check for new mail less frequently or even by request only. On the start screen, open up the email account you want to modify, and tap the three dots (...) in the right bottom corner of the inbox screen, and then tap Settings > sync settings and change the setting for Download new content.

2. Some apps may run in the background unnecessarily. On the start screen, swipe left, tap Settings, swipe to applications and tap background tasks. Tap the app you want to block, and tap block. Please check that Nokia Drive+ Beta app is blocked (set to Off) in background tasks.

3. Close the apps you are not using. To do that, press Back key. For example, when you are finished taking a picture, press the Back key to exit the camera viewfinder.

The screen

1. Set the screen switch off after a short time, go to Settings > lock screen (Lock+wallpaper) and change the setting for Screen times out after.

2. Lower the screen brightness, go to Settings > brightness > Level. Switch the Automatically adjust to Off and select the level.

3. If your phone is updated to Nokia Lumia Amber, change the setting for Nokia Glance Screen, go to Settings > display+touch. Swipe left to glance, and select Standby screen either Off or Timed.

Use network connections selectively

1. Switch Bluetooth off when you do not need it, go to Settings > Bluetooth, and then slide the Status (Searching and discoverable) toggle to Off.

2. Use a Wi-Fi connection to connect to the internet, rather than a mobile data (E, G, 3G, H+, 4G) connection.

3.Stop your phone scanning for available Wi-Fi networks if those are not available, go to Settings > WiFi (Windows Phone 8: Advanced), and uncheck the box next to Notify me when new networks are found.

4. Switch off location services if not needed so the phone will not look up your location frequently in the background (Settings > Location services > Off).

5. Use NFC on only when needed. To switch the tap+send feature off, go to Settings > tap+send, and switch NFC sharing toggle to Off.

6. Switch off Connect with Xbox LIVE when you not need it, go to Settings, swipe to applications and tap games.

7. Stop your phone connecting to Xbox Music cloud collection go to Settings > Applications > Music+Videos, and switch all relevant settings off.

Additionally, please take note of the following:

• Always charge the battery fully. Check Settings > battery saver > battery information. Note that older chargers may not fully charge the battery.

• Mute unnecessary sounds and functions, such as key press sounds. To do that, go to Settings > ringtones+sounds.

• Use wired headphones, rather than the loudspeaker.

• Make sure that your phone is running the latest software to get battery related improvements. Please check also that your phone apps are up-to-date.

If you have already performed the given steps but the issue still occurs, we then suggest that you send it to our authorized repair center for warranty coverage."