If the turtle's body temp goes down too much
the turtle will go back into burmation mode.
Turtles can go in and out of burmation over a winter
depending on the water and air temps.
But, that said, I'm not sure about a turtle who has
had access to a heating pad. This is a new one
on me ;-)
You might try a turtle fanciers internet group or
web page to find real experts.

I know the feeling of trying to get a bit more spring out
of spring when it wants to be blustery instead of
warm!

kathy :-)

www.blogfromthebog.com