Battery management is in Device manager, look for battery at the top of the list, It is just a background app that shows in the tray how much battery is left. I have no clue why this seems to cause such a huge DPCL spike when not on battery, but is has for me on 3 different laptops.
You don't need it unless your running on battery.
And someone mentioned above about running on battery, don't. With my laptops all hell breaks loose if you try to run a USB Audio interface or even a Projector. Keep it plugged in. Because a laptop uses a power supply system it is not subject to minor power variations.
If you hear clicks and pops due to RF interference that's another possibility but I doubt if that's whats going on.
But at this point if Latency Mon is telling you there are no DPCLAT issues you should stop looking for them and move to looking elsewhere. That is why I recommended running it. Did you run it with Sonar open and playing a project? Sounds like you did.
So now look for issues with your drivers and buffer sizes, faulty plug ins, hard drives etc.
Some folks have gone nuts for weeks looking for these sort of things only to find it was a bad cable. I just thought my power amp had finally started to die due to crackles in one speaker.
It was just a cable. Then you ask, how the heck can a cable just go bad when it is never moved, unplugged or touched??