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Home >> Volvo >> 2008 >> S40 T-5, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 9 (Battery, Brakes, Central Electronic Module (CEM), Climate Units, Engine Management System (Ems), Diagnosis - Design And Function (644 Body)) >> Battery (All) >> Terminology >> Acid density

Acid density

WARNING: This page is about a different car, the 2004 Volvo S40, 2003 Volvo S40, 2002 Volvo S40, 2001 Volvo S40, and 2000 Volvo S40. However, it is still accessible from the selected car via links, so may be relevant.

The unit showing the amount of sulphuric acid in the electrolyte and is a measurement of the battery voltage and charge status. The density of the acid is measured in g/cm3 . The higher the value of the acid density (i. e. high concentration of sulphuric acid), the higher the voltage and state of charge. A low acid density value means a correspondingly low concentration of sulphuric acid, low voltage and a reduced capability for providing current. The electrolyte in a fully charged battery has a density of 1.28 g/cm3 . The density of the electrolyte in a fully discharged battery is 1.10 g/cm3 .

HINT: For maintenance-free as well as sealed batteries (AGM) the battery acid cannot be accessed and thus its density cannot be measured. 

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