Method and device for voltage detection and charging of electric battery

A method for rated voltage detection and charging of an electric battery, said method comprising the steps of:

• connecting the electric battery to a power source;
• measuring a terminal voltage of the electric battery having a rated voltage being one of a first rated voltage and a second rated voltage, said first rated voltage being less than said second rated voltage;
• comparing said terminal voltage to a number of threshold voltages between a minimum threshold DC voltage VMIN and a maximum threshold DC voltage VMAX;
• determining a condition of the electric battery based on a comparison of said terminal voltage to said threshold voltages, said condition of the electric battery being one of ready to charge and fault;
• determining that said rated voltage of the electric battery being said second rated voltage if said determined condition of the electric battery being ready to charge;
• conducting a pre-charge process if said determined condition of the electric battery is neither ready to charge nor fault;
• determining said rated voltage of the electric battery based on a response to said pre-charge process;
• and
• charging the electric battery according to said rated voltage determined in the preceding step.