19.1 After charging according to Su

19.1 After charging according to Sub-clause 4.2 the battery shall be stored for 4 h on open circuit.19.2 If necessary the electrolyte level of each cell shall be adjusted to the maximum with water conforming to the standard mentioned in Sub-clause 2.2. The external surfaces of the battery shall be cleaned and dried.19.3 The battery shall then be tilted in either direction at intervals of not less than 30 s between each tilting as follows:a)the battery shall be tilted through 45° from the vertical for a maximum period of 1 s;b)the battery shall be maintained in this position for 3 s;C)the battery shall be returned to the vertical position for a maximum period of 1 s.19.4 At the end of the test, the presence of any overflow of electrolyte shall be checked and recorded.20. TEST FOR LEAKAGE OF ELECTROLYTE (HEAT ENDURANCE TEST)20.1 The battery, fully charged and filled with electrolyte, shall be maintained at a temperature of -10°C for 24 hours, at the end of this period, it shall be subjected to a temperature of 27°C for 30 minutes, after which it shall be stored either at a temperature of 50°C for 24 hours or at a temperature of 60°C for 10 hours.20.2 At the end of either period, the container and the welding of connections and covers shall be inspected. Presence of any leakage of the electrolyte or liquefaction of the sealing material shall be recorded.21. TEST FOR STRENGTH OF TERMINAL21.1 The strength of terminal shall be examined in such a way that appropriate adapters are fitted to positive and negative terminals.21.2 A torque shall be applied to the adapter using a torque wrench in the direction of rotation illustrated in Figure 1. The torque being 11.8 Nm for a thin type tapered terminal T1, 14.7 Nm for a thick terminal Ta and 4.9 Nm for a bolt and nut type terminal Ty. Check for any abnormality on the terminal part.