In a gas turbine power generator system, when there is an increase in the demand of a user system, a battery system supplies a supplemental electric power which is given by adding an added electric power to a difference between a current output of the power generator and the increased demand. The external reflection is minimized using property that output current increases in proportion to external reflection during optical alignment. A audio signal unit comprising three-conductor connection pins each one end of which is rotatably mounted in the casing and audio cables each of which is connected with said each one end of the three-conductor connection pins respectively. Such that the phase shift delay between the two selected clock signals is representative of the non-integer value of K. Re-precipitation of lithium carbonate by the formation of bicarbonate of lithium allows for the removal of the majority of contaminants which co-purify with lithium carbonate and yield battery grade highly purified lithium carbonate.