Battery test
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The battery acid density can be used to measure the charge state. However this test produces uncertainty caused by a design-related range of variation. The acid density e.g. for a charged battery is 1.28 kg/l (in the tropical version the acid density is 1.23 kg/l).
Another interference factor is the acid lamination immediately after filling with distilled water.
Battery wear with partially sulphated and/or heavily contaminated plates will also lead to incorrect acid density test results.