This part of IEC 62984 specifies performance requirements and test procedures for High Temperature batteries based on sodium for mobile and/or stationary use and whose rated voltage does not exceed 1500 V DC. Sodium based batteries includes Sodium Sulphur Battery and Sodium Nickel Chloride battery; both are high temperature battery and using a solid, sodium conducting electrolyte. This standard does not cover aircraft batteries, covered by IEC 60952, and batteries for the propulsion of electric road vehicles, covered by IEC 61982. NOTE High Temperature batteries are electrochemical systems whose cells operating temperature is above 100 °C.