If you've recently updated your Samsung Galaxy S II (SGS2) to the latest ICS firmware, you may have noticed worse battery life - at least I did. But give it some time and it'll get better. Just take a look below.
Source: Samsung Official Kies
Android version: 4.0.3
Build Number: IML72K.XWLP7
I used to get about 2 days of battery life with light-medium usage on my SGS2 but immediately after the update I got less than 2 days of battery life on light usage:
I did notice that automatic Twitter, calendar, and GMail sync over WiFi quickly drained the battery. Oddly enough, my Exchange e-mails get synchronized automatically when I turn on WiFi even though I have my synchronization schedules set to manual. I haven't figured out what caused that sudden drop between 70-50%.
But after using the phone after a week and not leaving my WiFi on, I can get much better battery life:
That's over 3 days of battery life on the Samsung Galaxy S II.
With Gingerbread 2.3.4, it was a challenge to get 2 days of battery life but with Ice Cream Sandwich 4.0.3, it's easy to get 2 days and hitting 3 days has become the new challenge. Here are some battery stats after upgrading to ICS:
- On average usage I get 35 minutes of battery life for every 1% of battery loss.
- With WiFi on browsing web pages without Flash, for every 1% of battery I get 3 minutes.
- Assuming the battery readout is accurate, charging rate is 36% per hour with the included Samsung 700mA charger. USB charging provides 500mA so expect about 25% per hour.
- Leaving the phone on with display off, all data off, RAM memory cleared, and no background apps running, I get a little over 1 hour for every 1% of battery loss.
Are you seeing similar improvements to your battery with Ice Cream Sandwich?
Addition (6/16/2013): Battery drain has been dramatically improved with the Jelly Bean update so upgrade when you can!