[dshipmon]

Since I upgraded to OS 4.5 I noticed I have this feature under Options - Security that says "memory cleaning". It was disabled. Is this somthing that I should enable and does it serves the same purpose as a battery pull? I also noticed if I enable it it already have some registered cleaners listed.

Memory Cleaning is a security feature... not a maintenance feature.
It does not do the same thing as a battery pull.

Memory Cleaning writes over deleted memory to ensure that the erased data can not be recovered.

[takeshi]

A battery pull does far more than just freeing memory.

[ndub33]

You will see minimal to no impact on your memory by using this feature. It does no real harm to use it, but don't expect great results from a free memory perspective.

[SteveO86]

Also with everything mentioned, Memory Cleaning will also disable itself after a while if content protection is not turned on.