database processes the test information as follows the then current battery state of health is measured by an industry standard ohmic test which measures impedance conductance or resistance any one of these measurements will indicate the general then current state of health of the unit the future state of health is inferred by adjusting the test readings to u201c age u201d them according to the following logic the ohmic test reading is multiplied by a factor the factor is a monthly factor for the particular battery make and model the monthly factor is derived from statistical analysis of previous ohmic test readings of the same battery make and model previous ohmic tests are categorized by age of the battery at the time of the test into categories of 1 2 years 2 3 years 3 4 years more than 4 years batteries under one year old are excluded because predictive analysis assumes that any battery jars will last for at least one year this is true of any battery technology used for stationary battery deployment analyses of previous ohmic tests are used to compute a monthly change factor for each make and model for each temporal category as described above the appropriate monthly factor is used for any given jar depending upon the make and model and the current age of the jar the monthly projected future state of.