I have the integy Reactor 30. Last night I hooked up a multimeter to it to see where it actually cutoff. 4.2v for a 6 cell (gp3300) pack. This seems too low. Funny thing about it, as soon as the button popped the voltage jumped right back up to 7.2v. It gradually climbed from there, even with the fan running.
I have heard, but never opened it up, that there is an adjustable pot inside.
Should I bother? Also thought it was a bit strange how the voltege came back up. Any thoughts?