state of charge if the battery pack 14 is at its beginning of life bol or 100 remaining useful life curve 48 represents the minimum temperature at which the battery pack 14 may be operated at any particular state of charge if the battery pack 14 is at its end of life eol or near 0 remaining useful life the minimum allowable temperature shown by the curves 46 and 48 is determined by the required performance of discharge and charge power line 50 represents a constant or fixed minimum operating temperature which is typical of existing thermal management systems used in electric vehicles today point 52 represents a set point temperature for an operating condition at which the battery pack 14 is at a state of charge of 75 and a remaining useful life of 65 that is the point 52 is 65 of the distance from the curve 48 to the curve 46 distance 54 shows the difference in set point temperature between the strategy of the present invention which takes into account the state of charge and remaining useful life of the battery pack 14 and a traditional thermal management strategy which prescribes a fixed minimum operating temperature in the battery pack 14 the distance 54 is proportional to the amount of.