NOTE It is generally accepted that the required temperature will be achieved after a minimum period of 24h in the cooling chamber. 9.3.1.2 The battery shall then be discharged, either within or outside the cooling chamber, within 2 min after the end of the cooling period with a current Icc (see 7.1.1). This current shall be kept constant to within ±0,5 % during the discharge. 9.3.1.3 After 10 s discharge, the terminal voltage Uf10s shall be recorded. After 30 s discharge, the terminal voltage Uf30s shall also be recorded and the current shall be cut off. NOTE Subclauses 9.3.1.1 to 9.3.1.3 comprise stage 1 of the cranking performance test. 9.3.1.4 The test shall be continued after a rest time of 20 s ± 1s. 9.3.1.5 The battery shall then be discharged at 0,6 Icc. The current shall be kept constant to within ± 0,5 % during the discharge. The discharge shall be terminated when the battery voltage reaches 6V. 9.3.1.6 The discharge time (t6v), in seconds, at 0,6 Icc to 6V shall be recorded. NOTE Subclauses 9.3.1.4 to 9.3.1.6 comprise stage 2 of the cranking performance test. 9.3.2 Cranking performance test – Very cold climates This test shall be performed only if the battery is specified for very cold climate application by the manufacturer. The test method is the same as defined above for the standard temperatures with – cooling chamber temperature = –29 °C ± 1 °C; – Icc for very cold climate rated on the battery label by the manufacturer