New battery didn't fix battery life

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http://forum.xda-developers.com – Hi everyone, a while ago my phone's battery started draining very, very quickly. Even with the screen off pretty much all the time and no apps running, the battery drained within 3 to 4 hours or so. So I bought a new, 3500mah battery (old one was around 1400). This increased the battery life but it still drained for no reason. I updated my ROM several times but it didn't fix it. Any help? Sent from my Xperia Arc S using xda app-developers app (HowTos)