OK I took one of the suspect battery paks and got one of the cheap ofna chargers that charge at 100ma, and let it charge for 2 hours. I plugged it in, and simulated driving the car, servos connected, granted I realize the load on the servos will not get the same load as driving, but watching the trandsponder LED, the system ran for 8 plus minutes, and no flickering on the transponder LED. I normally use a Trinton Jr. charger, and usually I charge at 1 amp, the NM are 1600ma, so I changed it to .5 ma and charged the other suspect pak, this took about an hour to charge up, I then waited about 15 minutes, and plugged it into the buggy, same servos etc, and this set up lasted 8 minutes, no problems. The only difference from at the track is that I usually have been chargeing at 1 amp, I've been doing this for a few years, now is it possible that the charger not charge properly at 1 amp but OK at 1/2 amp? I wouldn't think so, I'm gonna try everything again but drive it, but has anybody ran into this ? I'm gonna replace the charger, but I did have a guy peak chage the battery at the track, and it only took 3 minutes to peak it off, and died after 2 minutes. I'm getting to the point of just replacing the batteries and charger, but is this making any sence?