The above comments on not worrying about memory are correct. It has really never been a real problem, even in the old days. Since you appear to be new to the game, do check out the rcbatteryclinic.com, it is very good with accurate info being distributed. Also, refrain from running your batteries down by just leaving the system on. One cell (the weaker one) will always be discharged faster than the others and can become reverse charged and destroyed by the current from the still functioning cells. It will not hurt a cell to be discharged to zero but NEVER reverse charge it. The reason for the "only discharge to 1 volt per cell" rule is to prevent the inadvertent reverse charge of that weakest cell. Ror NiCads if you were to monitor each individual cell, you could discharge the pack until that weakest cell reached zero volts with no damage to any cell. Since this is difficult at best to do, just stop the discharge when you get to the 1 volt/cell point.