Specifications

DFP4 2011 Operation Manual

For batteries without testers:

1. Remove the sealing caps (1)

2. The electrolyte should be 10 to 15mm above the top of the plates

3. If necessary top off the battery with distilled water

4. Screw the sealing caps back into place

6.5.2.3. Checking the Electrolyte Density

• Measure the density of the electrolyte in each of the cells using a commercial

hydrometer.

• The hydrometer reading indicates the battery’s state of charge.

• The temperature of the electrolyte should be +20°C (68°F) when taking the

measurement.

The following chart is used to determine the charge status of the battery based on the

electrolyte density.

Electrolyte Density

in [kg/l] in [۫Be' (Baume' scale)* Charge status

Normal Tropical Normal Tropical

1.28 1.23 32 27 well charged

1.2 1.12 24 16 semi-charged, re-charge

1.12 1.08 16 11 dis-charged, immediately charge

* NOTE: The Baume’ scale is out of date and is rarely used today.