just use data connection when needed only. please don't compare with BB battery with data on 24 hours

Hmm, honestly is it the applications or the display that's consuming most of the battery?

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Added on January 26, 2012, 11:50 pmHahaha didn't compare with BB lah. I'm comparing with my Galaxy W. My brother use Galaxy S2 also battery can't last more than 7 hours. I thought it was his only. Looks like most of you on this thread also same problem.

This post has been edited by Besanth: Jan 26 2012, 11:50 PM

Display consume most batt. Its not a problem, its a feature. Cos no one ever said the batt can last long.

If heavy web browsing can easily finish in around 4 hours lah..I'm on an average of 15 hours with moderate usage...if mostly idling can easily get close to 2 days

Words of wisdom! So, if I want my S2 to last longer I should crank the brightness really low? Would that increase my battery life?

Less bright = More battery

Reduce brightness and dun use auto brightness. And use wifi over data.

its not a problem.like anttoo said, its a feature. and i'm not bothered with the battery drain any more. the best way to make it last longer:

quick and dirty guide to have less battery drain:

- use 2G-only if you don't need 3G
- monitor programs which cause wake-lock. use betterbatterystats and either uninstall or tweak them
- do not use task killers. see the previous item and find the malicious programs instead of repeatedly killing them.
- do not activate google latitude on maps.
- if you don't need pushmail, uncheck gmail sync and use k-9 mail to pull mail, lets say, every 1 hour or so.
- go to settings / location and security. disable "use wireless networks" and "use gps satellites". enable them when you need them, other than that keep them disabled.
- disabling auto-brightness and using a low brightness level helps. do you know that you can adjust the brightness by swiping your finger across the notification bar? try it...
- using juicedefender may help, but it may also cause more drain. test it yourself.
- if you need more speed than 2.5G (i.e. edge) disable HSDPA (*#301279#, select 2 then select 1). you will have 3G instead of H(SDPA) and I think it is fast enough
- disable fast dormancy. dial *#9900# and disable.
- disable auto sign in for google talk (search for talk in appdrawer and use settings to disable automatic sign in)
- disable samsung update and don't use samsung gadgets if you are not in love with them. (this part may be taken care of the rom developers)
- try several radios. I recommend you to try KE7, KG2 and KH3 and choose the one which suits you best. KG2 seems to be the best for me. however, in terms of battery life, there is not much difference between those three.
- be aware that more you use your phone more the battery drains don't complain like "my battery drains quite fast but I did not use my phone. I only played angry birds for hours without making a single call" or don't expect to have a decent battery life if you use your phone as a computer or download torrents using your phone.

taken from Siyah kernel thread, XDA: http://forum.xda-developers.com/showthread.php?t=1263838

Yes..it's gonna make a lot of different on your battery when using 10% brightness compared to 90% brightness

For those who likes to watch Korean movies, tv etc, do check out Viki Premiere from Samsung Apps.

Got to agree on this. We using Super Amoled -.-" But try put 100% brightness in a dark room. Lol...

But, again, if you want big battery life, bring a charger or use power bank

talking about *#301279#..
wats the symbol for hsdpa?.. not hsupa which is H+
i tried disabling hsupa just now n i think it load faster cuz the fon dun need to switch to h+ everytime before receiving data.. it starts straight from 3g.. so i think its better this way... on umobile anyway..

Good guide but my only concern is I can't receive calls/sms when I am in 2G network. This pisses me off as I keep receiving missed-call alert.

Added on is because you can't receive sms when data is moving in 2G... this causes delay and people often fed up calling me. Although all your synch are turned to the most-"manual-est" possible but smart phone is still smart phone. There is no 100%-zero-synch.

H is HSDPA

@nicregi: you back to v5 already?

can last up to 4 hours if browsing heavily

Yes. Siberian Tiger released JKAY for CheckROM v5 and HyperDroid v6 just now.

The reason I revert back is because for some reason HyperDroid doesn't work well with Thunderbolt. Taking forever to load or stuck at bootloop on normal turn on or reboot. Very weird. Tried twice and was just too much work.

How about you?

hmm.. does not see H on umobile.. only H+ and 3g.. nth in between.. anyone can confirm this?..

I'm sure you can brighten the whole dark room if you use 100% brightness ~~LOL~~

You can received call and SMS with 2G but not mms. :-P

Since *#301279# option 2... still maintain HSDPA speeds although it only shows 3G.. I think that is sufficient since I been using this and it does prolong me a lot of battery. I tried on it yesterday and the battery is draining real fast.

The network signal strength does play a role here. I am on DiGi and if the signal is strong and it doesn't keep confusing the phone to select over which network, then we won't be having such a terrible drainage of battery.