This is a simple Electronic Rf Type Battery Charger Circuit Diagram. This type of charger couples RF from L2 to an external pickup coil. The pickup coil connects to a rectifier and battery to be charged. This idea is handy because no wire or contacts are required. L2 is 10T #24 wire and L3 is 10T #30 wire. Both coils are mounted on a 1 V ferrite rod.
Electronic Rf Type Battery Charger Circuit Diagram