so, i am running traxxas nimh 7 cell 3000mah battery (8.4v). I have read around on here and have found a few debates of whether or not to run the car until it doesn't move, or to stop when you notice a decrease in performance of the car. I used to run them as far as they would go then let them cool and put them on the charger. just this last time tho i decided to stop when i noticed a performance drop. i brought them in and checked the voltage. 8.8v. now, i know that when a battery pack is fully charged it will have excess voltage of what the pack is "rated" for. but my question is: does the battery still have a higher voltage than what it is rated for even after the battery is discharged? Or better yet, what is the minimum amount of voltage a battery can have before you hurt it?