yes I have used the "Jumping" thing on the dead or backward cell and it did work BUT the cell can fail at anytime. We called it "Son- of -a- B*tching" because that was the amount of time we had the power applied (the time to say it). First we checked all the cells in the pack with a volt meter any that weren't up to 1.2 volts we "Jumped" those cells then re-tested the voltage. If we got the 1.2 volt reading then we just charged the pack as usual. BUT I say again the cell could fail at anytime. And a !!!WARNING!!! the cell could explode as well it will be !!!!!!YOUR DECISION!!!!!! to revive the cell