Helron, one of the things you may want to check is to make sure you are not on global data mode (will suck battery lots). Go into settings--> more... (under data usage)--> mobile networks--> network mode. Select LTE/CDMA.
Do you have a Maxx or a Razr? 24 hours on a Razr is excellent battery life, not so on a Maxx. 18 hours on a Razr is still very good. It may just be a few tweaks to get your old battery life back or it could be that some of JB's added features (such as Google Now) will drain more than what was draining on ICS.
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