can nimh bats be revived?

[turbo scorpion]

I hsve a few nimh batts that have had little use. They worked great last time i had em out and stored them charged up. Now they wont power the car for more than 2 min. They read 8.4v (7cell).
I put them on the charger in discharge mode and at 0.1amp the volts drop from8.4v to 1.0v on less than a min.

Is there any way to revive the pack or it it toast?