The number of balls that float to the top of the sample indicate the state of charge.Īfter taking the reading, squeeze the bulb to return the electrolyte to its cell, and test the other cells in turn. Some hydrometers have three small balls of different weights instead of a float.
#VARTA CAR BATTERY INDICATOR FULL#
The float may be graded red, yellow and green to show low, half or full charge. A reading of, say, 1.200 would show the battery to be about half charged. The state of charge can be gauged from how much the figure is below 1.290. Read off the graduation mark which is level with the surface of the electrolyte. Insert the syringe into a cell, then squeeze and release the bulb to draw up a sample of electrolyte - enough to raise the float but not enough to make it touch the bulb. The instrument for measuring specific gravity is a However, as the battery loses charge, the specific gravity drops to 1.130 or lower. The figure for electrolyte in a fully charged battery is between 1.270 and 1.290 - meaning that it is 1.270 times heavier than water. The specific gravity is the weight of a specificĬompared with that of the same volume of water. Of the electrolyte, which varies according to the state of charge. You can find out how well a battery is charged by measuring the If a charging-system fault is overcharging the battery, you may find damp patches around the cell caps and even droplets of electrolyte on the battery top (See If more than the usual amount of topping up suddenly becomes necessary, look for the cause. In most cases, the monthly check is enough - but check more often in hot weather, or if the level is well down at the monthly check. Generally, the higher the temperature the more frequently a battery may need topping up. How quickly the electrolyte evaporates depends a great deal on two factors: the under-bonnet temperature (if the battery is located there) and whether the That in turn will ruin the battery, which needs all its cells functioning to retain its full electricalĪnd deliver power.
If the cell is left for some time with the plates exposed, it can be damaged. Once the level falls below the tops of the battery If it goes in your eye, wash thoroughly in running water and call a doctor.Ī drop in the battery fluid level is caused - provided that there are no leaks - by
#VARTA CAR BATTERY INDICATOR SKIN#
If you are splashed, wash the affected skin area immediately. Do not allow any to splash on to your skin or your clothing. The electrolyte is a mixture of sulphuric acid and purified water, and is corrosive and dangerous. The fluid inside - called the electrolyte - can give off explosive gas, especially soon after the battery has been charged. To leak out through the cell-cap vents as the battery is charged.ĭo not use a naked flame when checking the battery.
Use distilled or otherwise purified water, or a proprietary topping-up fluid.
Never top up with tap water, which contains minerals which may damage the battery. The fluid level in other batteries should be checked at least once a month and topped up if it drops below the correct level - just above the tops of the apart from a small vent hole which allows
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