Race Li-Po's
 

how do you check if one or both cells have gone soft under load?

ran two pack's last night and the car slowed at about 5 mins in, in a 6 min race

voltages during recharge were as expected and within 0.05 of each other

could put them on a 30 amp Pro-Trak but not sure if the enclosed 4mm tubes will stay connected to the cell's inside the case

Pro-Trak could tell if round cells are getting old as the % value rose as the peak volts went up during charge but don't think this applies to lipo's due to the peak volts always being 8.4v unless one cell peaks well before the other when in the balance stage