How to determine the battery state of charge, depending on the density of the electrolyte.

The electrolyte, which is used for the storage batteries - a mixture consisting of 64% water and 36% sulfuric acid.

At discharge the battery in the investigation of chemical reactions of the electrolyte solution is consumed sulfuric acid with the simultaneous formation of water and electrolyte density decreases, and at a charge, on the contrary, the water consumed in the formation of sulfuric acid and the density of the electrolyte increases. Changing the density of the electrolyte is an effective means of determining the level of battery charge. For a fully charged battery, the electrolyte density of 1.27 g/cm3 is typically at a temperature of 20 C.      

The density of the electrolyte at a temperature of 15 C (g/cm3) Battery voltage with no load (V) Battery voltage during 100A load is connected Battery state of charge (%) Freezing temperature of electrolyte (C)
1,27 12,66 10,80 100,00 -60
1,26 12,60 10,66 94,00 -55
1,25 12,54 10,50 87,50 -50
1,24 12,48 10,34 81,00 -46
1,23 12,42 10,20 75,00 -42
1,22 12,36 10,06 69,00 -37
1,21 12,30 9,90 62,50 -32
1,20 12,24 9,74 56,00 -27
1,19 12,18 9,60 50,00 -24
1,18 12,12 9,46 44,00 -18
1,17 12,06 9,30 37,50 -16
1,16 12,00 9,14 31,00 -14
1,15 11,94 9,00 25,00 -13
1,14 11,88 8,84 19,00 -11
1,13 11,82 8,68 12,56 -9
1,12 11,76 8,54 6,00 -8
1,11 11,70 8,40 0 -7  
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