I still use high capacity NiCADs in many of my models. I find that the chargers I have from decades ago are inadequate because of the low charge rates, accucycle, digipace... The high current multi chemistry chargers I have are fine but mostly single output. When I want to fly several of my models I have many big packs that need to be charged. I looked at the X4 and thought it might fit, multi chemistry and 50W per port ( X4 = 4 ports ). The NiCADs packs I have are 2000mAH+ 4 and 5 cell packs so the 50W per port fits nicely. Will also work fine with the lower cell count and/or capacity LiPo packs ( supports 1 - 6 cell ). I have used it a couple times now and it seems to work well. Reasonable to set up all the different parameters. Each port is completely independent and can be set up separately. The only real nit I have with it is its cooling fan. When it starts to get warm, instead of ramping a fan up, it pulses the fan full on and off. As I sit here writing this, instead of a low rpm constant fan, it is pulsing, kind of annoying. I do like the utility of this charger though. Was really pleased that it is in a metal case and feels substantial ( though the weight is probably the AC transformer ).