Technological improvements have done much to lower the cost of batteries and battery chargers, integral elements in the Radio Control universe. Some R/C vehicles need separate battery systems to operate. An electric powered vehicle needs a main battery for a motor power source, plus a separate battery for the receiver and batteries for the vehicle transmitter. Alkaline, NiMH, NiCD, LiPo and LiFe batteries can be used in some of these applications. Specific chargers are required for specific battery types. Some chargers for LiPo and LiFe batteries charge and balance individual cells independently. There are battery chargers that operate on both AC and DC power.