Electrolyte density together with voltage measurement on conclusions of the rechargeable battery allow to draw an exact conclusion on degree of state of charge of the battery. For check the areometer which can be bought in specialized shop serves. The more electrolyte density, the more rises the areometer float (emerges). On a scale of the areometer of value are expressed in terms of density ^(kg/cm3).

During measurement of density of electrolyte you watch that on the surface of the battery, the body and other details from a pipette of the areometer did not fall the electrolyte drops containing sulfuric acid which causes corrosion and leakages of current.

Electrolyte density in completely charged rechargeable battery makes 1,28 ^g/cm3.

Electrolyte density in the rechargeable battery discharged for 25% makes 1,24 ^g/cm3.

Electrolyte density in the rechargeable battery discharged for 50% makes 1,20 ^g/cm3.

Remove the rechargeable battery discharged more than for 25% in the winter and more than for 50% in the summer from the car and recharge.

At measurement of density of electrolyte temperature of electrolyte has to be in limits of 20-30 °C. Density of electrolyte has to be measured in each element (bank) of the rechargeable battery. After measurement of density of electrolyte it is possible establish battery razryazhennost degree.

In all elements electrolyte has to have identical density.

Electrolyte density in completely charged rechargeable battery makes 1,28 ^g/cm3.

Electrolyte density to the rechargeable battery discharged for 25% makes 1,24 ^g/cm3.

Electrolyte density to the rechargeable battery discharged for 50% makes 1,20 ^g/cm3.

Remove the rechargeable battery discharged more than for 25% in the winter and more than for 50% in the summer from the car and recharge.