This is the 2^nd year Report of the highest rated contract in Physics by the Bulgarian Ministry of Science and Education for 2005—Project No VU-F1/2005. Project team leader: Prof. D.Sc. Julian Burov. Project Manager: Dr. George R. Ivanov, CEO.

INSTITUTE OF ELECTROCHEMISTRY AND ENERGY SYSTEMS, of the Bulgarian Academy of Sciences E-lectures on battery testing, electrochemistry, impedance measurements, Differential Impedance Analysis (DIA) method.