I think Freeza powering up to full power was something different, like if his power up had some refreshing power, similar to the 1st SSJ transformation. Said that, I believe Cell wouldn't reach the same power he did against Gohan. Maybe 80% or so.
Do we have other examples of "beaten up" opponents trying to reach full power? I can think of Piccolo Daimao performing a full power power up after being beaten by post Water Goku, although his power wasn't noted to have gone down.