This one is a bit hard to answer. Usually the telltale signs are indistinct printing of the manufacture date and the QR code, and maybe the overall feel of the finishing is rough to the hands. Otherwise you will only find out after you buy.

I suggest you check out brotan he may have some stocks of good compatible batteries. He is a good seller and a number of us here have bought various items from him.

I have been playing that game for so long already and now I am at level 250..
The game is so smooth and no lags and no shutdowns...

Btw I just came back from sunway pyramid and I saw the shops selling note 2 in pink color..

Yes, I am always connected and always syncing on fb..
That's strange, about 3 months back, I played and never once automatic exit..
Maybe you could try to uninstall and than install back..
Btw did you activate your developers settings and did some GPU rendering on some apps, last time I tried that, most of the apps crashed and could not load up..

R u using the offical FB app or Friendcaster or any 3rd party fb apps ? I got friends facing problem logging in as they r not on official FB app , they were using friendcaster ..