ever since I upgraded to 4.1 and now 4.1.2 android system will be my highest battery user if I don't use the phone much. If I use it then screen goes top but android system still sits high up in the top few places I don't know why I've tried several factory resets and started fresh and still get the problem. I think it's Google now
try looking into the s voice as I had the same problem and shut down some things in s voice settings and now much better battery life. before I would use 50% of battery in about 4 hours of no use at all but maybe 1 text message turned s voice off and now much better. Also look at the GPS and make sure you only have what you want turned on.
Bad cell signal also comes under Android System. Install GSAM or Better Battery Stats if you actually want to resolve this issue, rather than us randomly giving you things it could be.
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