One of the important technical problems of various implantable devices concerns effectively supplying sufficient energy to allow devices to work for extended periods, steadily and reliably. Presently, batteries and magnetic induction are only power supplies widely used in clinics. Because the capability of batteries is limited, implantable devices have shorter lives and low energy transfer efficiencies. We presented a means of transferring electrical energy into rechargeable batteries in implantable device by using volume conduction of biological organisms. An energy transfer model of volume conduction was created using ANSYS V10. We analyzed the energy transfer efficiency from simulation results and provide reference for further study of energy transfer of volume conduction.