These LiFe batts. are great they are light, fit even the smallest planes, Charge fast and use the same charger as my flight liPo batteries I program the charger for them and charging is so easy.. The price is right as always with VH. I do not know why anyone would want to use NiCad or any other power source when these are so great. If there is a negative it is that they should be removed from the plane for charging as they should be balanced to keep the batt charge even but they charge in minutes not hours.