rationalskepticism.org

A number of benefits appear when an electric vehicle battery is sized for long range. A larger-capacity battery results in a lower average depth of discharge and consequently longer cycle life and lower peak charge/discharge rate. If maximum charge is limited to 80% under everyday driving conditions, maximum voltage is avoided. If the battery pack is also thermally controlled, both maximum voltage and high temperatures are avoided. In this way, controlled conditions can increase battery life substantially.