From what I see your app lock you less than 1 min..which is not an issue..if you dont use the stock facebook app..it can save more 

Some are system apps..how many % drop overnight? How long for the night? standard 8 hours if drop 3-5% consider normal.. 

mine is never normal then. the least also 8% drop. but y so concern bout the percentage? anyhow after u wake up u oso will charge it what

Every night constantly drain 10%? everyday you check your wakelock also the same? 
Any battery saving app using? try Juice Defender 

then please tell me the difference in 1% can last u how many minutes. browsing? within seconds 1% gone.

Try to monitor 1 or 2 more nights..reboot before go sleep and never launch any apps again 
After that, if still not satisfy, try to use Juice Defender 

Every night constantly drain 10%? everyday you check your wakelock also the same? 
Any battery saving app using? try Juice Defender 

Sorry for asking, what is the main diff between i9100 and i9100g? only the processor? is it the reason why S2 price dropped significantly?

from what rumour says, prime will come with OMAP 4460, the newer version instead of OMAP4430 in i9100G. also have rumours it will be Exynos 4212

The Nexus Phone will be built according to Google requirements.

we dont know yet coz its a new verison of OMAP. no benchmarks yet.

Oh yeah! I'd must say it's not that shabby for our SGS2. Review from anandtech which can't be wrong.

The Fastest Smartphone SoC Today: Samsung Exynos 4210

Samsung has been Apple's sole application processor supplier since the release of the original iPhone. It's unclear how much Samsung contributes to the design process, especially with later SoCs like the A4 and A5 carrying the Apple brand. It's possible that Samsung is now no more than a manufacturing house for Apple.

Needless to say, the past few years of supplying SoCs for the iPhone and iPad have given Samsung a good idea of what the market wants from an application processor. We first got the hint that Samsung knew what it was up to with its Hummingbird SoC, used in the Galaxy S line of smartphones.

Hummingbird featured a 1GHz ARM Cortex A8 core and an Imagination Technologies PowerVR SGX 540 GPU. Although those specs don't seem very impressive today, Hummingbird helped Samsung ship more Android smartphones than any of its competitors in 2010. At a high level, Hummingbird looked a lot like Apple's A4 used in the iPad and iPhone 4. Its predecessor looked a lot like Apple's 3rd generation SoC used in the iPhone 3GS.

Source: http://www.anandtech.com/show/4686/samsung...st-redefined/14

Additional read-up...

Architecturally, the Exynos 4210 isn't too far from Apple's A5, NVIDIA's Tegra 2 or TI's OMAP 4. This is the same CPU configuration as all of the aforementioned SoCs, with a twist. While the A5, Tegra 2 and OMAP 4 all have a pair of ARM Cortex A9 cores running at 1GHz, Exynos pushes the default clock speed up to 1.2GHz. Samsung is able to hit higher clock speeds either through higher than normal voltages or as a result of its close foundry/design relationship.