While we're on the subject of PS Energy, I have to add that while the string does become a rocket launcher after 6 hours or so, it's still very soft and comfortable. So yes, you have to work really hard to control the power, and you definitely get some flyaway shots from time to time, you can still actually play with the string without it killing your arm like 99% of the other polys that go dead after 10 hours.
So if you really wanted to, and you could control the increased power, you could actually continue to use PS Energy for many hours beyond the 6 hour mark, probably 10-12 hours or more without any other problems.
Lois: "Peter, I'm not wearing any panties."
Peter: "That's ok, honey. We can throw that chair out."