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Just one question though: What's your screen brightness level? <--- As this can heavily influence battery life
I set mine around 40%..it's bright enough.
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ii) Amroth said his battery is made in Japan and finished in China. This is a sign of AP?
Could be. I don't know. I got official 1 year SME warranty. Judging by the box and accessories, I doubt that mine is AP set (after years of getting cheated of people selling me recon nokia, AP nokia and recon blackberries, well, thankfully I learned.)
Back to the battery, my phone lasts around the same as my friend's Galaxy S2 (ORI). So no worry there. If I'm not mistaken, my sister's brightstar blackberry bold's battery also cell made in singapore but finished in china, and her blackberry can last for 2 days top. (But, that's blackberry.)
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How's the camera compared to, say, Sony Ericsson's 5MP camera
SE usually have better cameras on their phone. Don't really know why, sensor maybe? Though, I read review in GSMarena that S2 camera outperform the SE Arc 8MP with the hyped up Eximor sensor.
Quality wise, it's nice and clear enough as long as your picture has good exposure to light.