1. If the readings are uniform and high, e.g. 1.230 and upward, a reasonably charged battery is indicated. If the battery does not crank the engine there could be a loose connection in the battery, but more than likely a system fault is indicated.
2. Uniform low readings below 1.200 are indicative of inadequate charging or an electrical fault, which is discharging the battery.
3. Good readings on five cells, e.g. 1.230 - 1.250, and low readings on one cell, e.g. 1.180, would generally indicate a faulty cell. Any difference in readings of 0.05 points or more should be investigated.
However, there are many examples, and unless the age of the battery or visible mechanical damage warrants replacement, the battery should be charged and retested before discarding.
Some batteries are totally sealed in which case a voltmeter should be used to establish the state of charge. The voltage indicated in table above will assist in assessing the state of charge.
Due to the nature of the vehicles charging system and factors such as temperature the battery is generally only 70 - 80% charged. Occasional charging outside the vehicle recommended in some instances to avoid breakdowns and prolong battery life. Top