RE: G I Joe Jeep / HPI Crawler King battery
I have a different perspective.
I have a few batts that were over discharged to the point my Hitec 4X charger would not charge or recognize them,,,, Until I set it for the next lowest cell, in other words if I accidentally overdischarge my 3s batt I set the charger for 2s and use the appropriate adapter. I only charge the 3s set 2s longe enough to get the bat up to the minimum the charger looks for on 3s so up to at least 9.4-9.6 volts, then I set the charger back to 3s and it charges fine. I also use those batts on a regular basis which means I probably have over 30 charges on them since the "tickle charge" to bring up to 9.6vlts. This does not always work, in those cases I will use a different charger to just get a little voltage. If you need help with that I can discuss further with you. You don't always have to buy new batts, at least you can save a few.
I must warn you tho, Always charge in a proper lipo bag!! Its just responsible hobbying. And always watch them while charging, be sure they dont get too hot!!