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Idle battery. Care of 67 Idle battery. How it becomes discharged 89 Idle battery. How it sulphates 70 Illuminating gas and compressed air lead-burning outfit 149 Impurities 76 Impurities which attack the plates 77 Impurities which cause self-discharge 76 Incoming batteries. Examining and testing 317 Incoming batteries. General inspection of 320 Incoming batteries. Operation tests on 320 Incoming batteries. When it is necessary to open 326 Incoming batteries. When it is necessary to remove from car 325 Incoming batteries. When it is unnecessary to open 325 Incoming batteries. When it is unnecessary to remove from car 324 Installing battery on the car 236 Internal resistance 48 to 50 Isolators 408 Inspection to determine height of electrolyte 55