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INSPECTION
1. Electrolyte level inspection:
Before starting the in spection, ensure t hat t he battery h as been at rest for at least 3 0 minutes.
Open the caps of each single battery element and check that the electrolyte level is high enough to
cover the element plates. if it is not, top up with distilled or demineralised water to 5 - 7 mm over the
top of the plates. Do not fill beyond this point, since this can cause leaks due to the fluid expanding
during use or during recharging cycles, with teh risk fo corrosion of the casing, reduced electrical
isolation and discharging. Check the level and top it up with the battery charged
2. Electrolyte inspection:
The battery fluid should be transparent. Check for
clouding during the density check. In case of difficulty,
pour it into a cup for the inspection.
The check must always be carried out on several
cells, because the density may differ from one
element to another.
3. Checking the battery fluid density.
Use a hydrometer to measure the density of the
electrolyte.
Density at full charge ....
1.290 kg / l [20 °C]
Density when completely discharged....
1.130 kg / l [20 °C]
The density measurement varies according to the
electrolyte temperature; it is advisable always to
measure the electrolyte temperature at the same time
as the density.
To have the exact density value, each measurement
must be considered in relation to the standard
temperature of 20°C.
Equation for converting the real measured density
with the ideal density at 20°C.
D
20
= D
r
+ [ 0.0007 (T
r
- 20) ]
D
20
: Ideal density at 20°C
D
r
: Real density measured at T
r
°C
T
r
: Real temperature of the electrolyte (°C)
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