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Battery life after ICS update

I've updated to ICS and everything seems OK except the battery has halved! :mad:Is there a setting that has been introduced or changed with this update? If I leave the phone on overnight it will lose 50% and, more often than not, is now flat in the morning. Real pain! Does anyone have any tips?
Thanks for your time
HP
 
I've updated to ICS and everything seems OK except the battery has halved! :mad:Is there a setting that has been introduced or changed with this update? If I leave the phone on overnight it will lose 50% and, more often than not, is now flat in the morning. Real pain! Does anyone have any tips?
Thanks for your time
HP

You can try apps like Juice Defender to see if it improves your battery performance, but I believe there is something wrong with your phone. Losing 50% of battery overnight is impossible for me since I only lose 2-3% overnight (admittedly I am using a custom ROM with custom kernel, so battery performance can be better on mine). You may also want to install battery monitoring app to see if your battery drain is normal or not (for me it is around 10-50 mA on idle). If it is not, you should starting looking for rogue apps.
Lastly, I read somewhere that a factory reset is recommended when you update to ICS, so if you haven't done so, you can give it a try.
 
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My battery life was really bad after ICS upgrade... it would last around 4 or 5 hours only.

Then I changed the wifi setting and my battery life return to normal as before the upgrade:

Settings>WiFi>Advanced>Keep Wi-Fi during Sleep -> changed to "ALWAYS"

I assume that when using the 4G it uses lot more battery than using WIFI.
With the ICS upgrade the default "Keep Wi-Fi on during sleep" setting changed to "Never" thus wifi turning off when the phone goes to sleep, then automatically the 4G kicked in draining all my battery.

Now since the WI-Fi is on even during sleep, the wifi keeps connected when available, the 4G is off, thus saving my battery life.
 
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