the issue with catorise is due to a bug in hildon-desktop. if you swing in and out of categories in catorise a few times, your idle cpu consumption goes up to between 4 to 7 percent as opposed to almost nothing (typically less than 3 percent). this causes a drain in the battery.

catorise is not the source of the problem. it is a trigger. the root cause is the bug. i use catorise and there are 2 solutions to this issue.
1. restart hildon-desktop when you notice cpu to be a bit high. you can use top or batterygraph to check this.
2. install a custom build of hildon-desktop. there's one by mohammadag somewhere in the threads here. search for it. remember to pin the app or apt-get upgrade will cause the default buggy hildon-desktop to overwrite the custom build.