METHOD OF DETERMINING THE STATE OF HEALTH OF A BATTERY

Method of determining the state of health of a battery (1), comprising steps of:- carrying out a full charging or discharging cycle on said battery (1), while taking voltage and current measurements, and generating an initial differential capacitance curve based on said voltage and current measurements;- extracting n values of differential capacitance at a plurality of voltages spaced at predetermined voltage intervals across a predetermined voltage range;- fitting a model curve to said n values of differential capacitance;- integrating said model curve to obtain an initial capacity measurement;- periodically, measuring differential capacitance at one of said predetermined voltages;- updating said model curve based on said measured differential capacitance;- integrating said updated model curve to obtain an updated capacity measurement;- comparing said updated capacity measurement to said initial capacity measurement in order to determine said state of health.