9.6 Endurance test for batteries 9.

9.6 Endurance test for batteries 9.6.1 Corrosion test 9.6.1.1 The test shall be carried out on fully charged batteries in accordance with 8.2.2 (vented batteries) or 8.2.4 (VRLA), but with the times of the constant voltage charge being limited to 10 h. 9.6.1.2 The battery shall be placed in a water bath maintained at a temperature of 60 °C ± 2 °C. The terminal base of the battery shall be at least 15 mm but not more than 25 mm above the level of the water. If several batteries are in the same water bath then the distance between them and also the distance to the walls of the bath shall be at least 25 mm. 9.6.1.3 The battery, maintained at 60 °C ± 2 °C, shall be charged at a constant voltage of 14,00 V ± 0,10 V, for a period of 13 days. 9.6.1.4 The battery shall be stored on open circuit, still at 60 °C ± 2 °C, for a period of 13 days. No connecting clamps or cables shall be attached to the terminals. 9.6.1.5 The battery shall be cooled to reach 25ºC ±2ºC . Purified water shall be added, if possible, to maintain electrolyte level in accordance with the manufacturer’s recommendations (this does not apply to VRLA batteries). 9.6.1.6 The battery shall then be recharged in accordance with 8.2.2 (vented batteries) or 8.2.4 (VRLA) but with the times of the constant voltage charge being limited to 6 h. 9.6.1.7 The battery, maintained at 25 °C ± 2 °C, shall be stored for a rest period of 20 h.