I recently purchased this charger (mrc 969). It came with a slip indicating it had the charge/discharge and li-po circut upgrade. I purchased this charger specificaly so I could charge my li-po packs for my 18th scale cars. Is this charger safe with the upgrades? I do have a li-po specific charger also but I wanted a charger that could charge ni-mh packs too for occasional 10/th scale racing. I wish I read this thread before I made my purchase!!