Why freeze the electrolyte

At discharge of battery electrolyte density decreases that is the specific amount of the sulfuric acid containing in solution of electrolyte decreases and water is formed. The battery discharge is deeper, the negative temperature at which electrolyte can freeze is higher. For example, at the density of 1.11 g / cm 3 electrolyte will freeze already at -7 °C and at the density of 1.27 g / cm 3 - only at -58 °C.

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