Patent ID: 8106542

Claim:
A power source comprising: a positive output; a negative output; a plurality of cells, each of which comprises a positive electrode and a negative electrode; a plurality of positive switches, each of which is for connecting or disconnecting a corresponding positive electrode to the positive output; a plurality of negative switches, each of which is for connecting or disconnecting a corresponding negative electrode to the negative output; and a plurality of serializing switches, each of which is for connecting or disconnecting a positive electrode of a corresponding cell to a negative electrode of an adjacent cell; a calculator configured for calculating a serializing number and a parallelizing number using the following formulas: N 1=[ V /ε];and (1): N 2=[ IR/ε−N], (2): wherein N 1 is the serializing number, V is a rated voltage of a load to be connected between the positive output and the negative output, ε is an output voltage of each cell, [V/ε] represents rounding off V/ε, N 2 is the parallelizing number, I is a rated flow of electrical current of the load, R is a resistance of the load, N is a total number of the cells, [IR/ε−N] represents rounding off (IR/ε−N), and (N 1 +N 2 +1)<N.