7.5.4.2 High-energy battery system The remaining C/3 energy and SOC from the initial SOC shall be reported. The loss of energy and SOC after the rest period shall be expressed as a percentage of the initial SOC. 7.6 Cranking power at low temperature7.6.1 Purpose The cranking power test at low temperatures is intended to measure the power capability at low temperatures. The relevant temperatures shall be −18 °C and, if agreed between the supplier and customer, also −30 °C. The aim is to generate a database of time-dependent power output at low temperatures. This test applies to high-power battery systems only. 7.6.2 Test procedure The test for cranking power at −18 °C shall be performed at the lowest SOC level permitted, as specified by the supplier according to the test sequence in Table 18. Table 18 — Test sequence cranking power at low temperature (−18 °C) Step Procedure Test temperature