Galaxy Note Battery Life [ICS]

Upgrading my Galaxy Note from Gingerbread (2.3.5) to Android 4.0.3 Ice Cream Sandwich (ICS) brought a lot of improvement to the experience. With its refined look and updated apps, my smartphone looked almost perfect, until few hours later when I discovered the “new” bug that came with this update: the fat Li-Ion 2500 mAh battery drained in no more than 8 hours!


Even with its amazing specs and dimensions, I was able to use my Galaxy Note for 1 day and half under Gingerbread. The latest Samsung Galaxy Note Android ICS update 4.0.3 introduced a serious battery life problem…

In this post I am going to show you how to improve  Samsung Galaxy Note battery life after ICS upgrade.

The Battery Issue

I checked my phone battery history graph and it was clear that the CPU was active, even when screen was off. There were strange bursts of activity. I had no apps running in background, no synchronization, GPS, Bluetooth, WiFi and Data were also all disabled but the Dual-core 1.4 GHz ARM Cortex-A9 CPU never sleeps. No feature that could normally cause such a fast battery drain on an android device is active so I concluded that the new ICS update is most probably the culprit.

Galaxy Note Battery Life Problem ICS

Galaxy Note Battery Life Problem [ICS]

After some tests I found that the main actions that caused this behavior are :

  • Putting the phone to charge while turned off: whenever I put the smartphone to charge while turned off the battery life problem is back again
  • Turning on notification and system sounds

Please note that sometimes the problem happens without doing any of the above.

Poor Galaxy Note Battery Life

How to check if your phone is having this issue :

  • Install CPU Spy (free application, download from Google Play)
  • Reset timers
  • Let the phone idle for some minutes and then refresh timers on CPU Spy screen.
Galaxy Note Battery Life - CPU at 200 MHz

Galaxy Note Battery Life – CPU at 200 MHz

If you see that your CPU keeps working at 200 MHz instead of going to Deep Sleep state then you can confirm that you are affected. The CPU never sleeps so that Galaxy Note Battery drain so fast.

The Solution To Make Mobile Phone Battery Last Longer Under Android ICS

Here is what you can you to stop the fast power drain:

  • Disable Notifications and System sounds by going through Settings => Sound => Volume and drage the last 2 sliders to the left
  • Turn off your Galaxy Note phone and remove battery for 2 minutes
  • Put back the battery and power on
  • Reset CPU Spy timers
  • Let the phone idle for some minutes and then refresh timers on CPU Spy screen.
Galaxy Note CPU Deep Sleep

Galaxy Note CPU Deep Sleep

If you notice that the CPU goes to Deep Sleep then the battery problem is gone. Don’t forget to check the battery usage graph to see CPU activity and battery performance of your mobile phone.

Now I’m enjoying great battery life on my Galaxy Note again! no more battery charge issues.

Samsung Galaxy Note Normal Battery Usage Graph [ICS]

Samsung Galaxy Note Normal Battery Usage Graph [ICS]

Samsung Galaxy Note Battery Life Graph

Samsung Galaxy Note Battery Life Graph

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