Coming from a newb, newb never had lipo but in a drill. I bought nano tech 5500 and a vicious technology's 5000 -70, for a few month an the resetence on the cels are low 3/1 and the nano the same but i would not buy another vicious due to the deans plug is fake an the leads coming out of the unit is chafed were the hard case digs into it ,,both are hard case they were cheep 30 and 47