Apart from the standard, beware of -devel and to some extent -testing software, it's worth looking at something like HTOP or Conky to see what's guzzling the resources. If batteries dry up fast - either you need a new one or a number of programmes are chewing cycles and or leaking memory, thus wasting electricity.

There are cases in which only a reflash will sort out the corruption of poor devel software. Or at least, it's significantly more practical to do this than rummage around trying to extract the problem and all its tenticles.

Edit: On re-reading this I see that neither the quoted comment, nor my reply have any mention or reference to the CSSU!