(g) When battery voltage drops to about 1.7 or less per cell when lamps are turned on, or lamps become very dim when the starting motor is cranking the engine, or the high rate discharge test shows that there is trouble in the cells.
(h) When you find that electrolyte is below tops of plates, and it requires considerable water to bring it up to the correct height.
(i) When battery overheats on charge, or discharge, although battery is not located in hot place, charging rate is not too high and lamps and accessories load is normal.
(j) When battery is more than a year old and action is not satisfactory.
(k) When a blacksmith, tinsmith or plumber has tried his hand at rebuilding the battery. Such a battery is shown in Fig. 189.
(1) When ends of care are bulged out.
3. When Is It Unnecessary to Open a Battery?
(a) When the only trouble is broken sealing compound. The battery should be resealed.
(b) When loose, corroded, or poorly burned on terminals and connectors have merely resulted in keeping battery only partly charged and no internal troubles exist. The remedy is to drill off the connectors, or terminals, and re-burn them.
(c) When the external condition of battery is good, and a bench charge, see page 198 (with several charge and discharge cycles if necessary) puts battery in a good condition, as indicated by voltage, cadmium, and 20 minute high rate discharge test.