5 BATTERIES Inspection of batteries XF 95 series Note: If the relative density in one of the cells is much lower than in the other cells, the cause may be cell closure. If the relative density of two adjacent cells is much lower than in the other cells, this indicates a leak in the cell partition. In both cases, the battery must be replaced. Voltage - The charging condition of the batteries can be measured using a sensitive, preferably digital voltmeter. This method can only be used 1 to 2 hours after full completion of charging or discharging. Measure the absolute rest voltage (the positive and negative terminals must be removed from the battery).
4 The charging condition of the battery can be calculated using the formula: Voltage per cell = relative density (kg/dm ) + 0.84. Example: For a fully charged battery, the relative density per cell is 1.28 kg/dm . The voltage per cell is therefore 1.28 + 0.84 = 2.12 V. A 12V battery has 6 cells. The total voltage for a charged battery is 6 x 2.12 = 12.72 V. The voltage of a half-charged battery is approx. 12.24 V. The voltage of a discharged battery is approx. 11.75 V. 4-2 200303