BATTERY CARE
BATTERY CARE
3-12
3-12
BA
BA
TTERY ELECTROLYTE SPECIFIC
TTERY ELECTROLYTE SPECIFIC
GRAVITY
GRAVITY
CONVERSION OF SPECIFIC GRAVITY AT
CONVERSION OF SPECIFIC GRAVITY AT
VARIOUS TEMPERATURES
VARIOUS TEMPERATURES
The specific gravity of battery electrolyte varies
The specific gravity of battery electrolyte varies
with the temperature. To know the correct specic
with the temperature. To know the correct specic
gravity of the electrolyte, you should measure
gravity of the electrolyte, you should measure
the electrolyte temperature, too, and convert the
the electrolyte temperature, too, and convert the
measured specific gravity into the value at the
measured specific gravity into the value at the
standard temperature, using the conversion table.
standard temperature, using the conversion table.
The standard specific gravity of the electrolyte in
The standard specific gravity of the electrolyte in
a fully charged battery is 1.280 at the standard
a fully charged battery is 1.280 at the standard
temperature of 20°C.
temperature of 20°C.
CONVERSION TABLE
CONVERSION TABLE
Example:
Example:
Suppose the electrolyte temperature is 5°C and the
Suppose the electrolyte temperature is 5°C and the
hydrometer reads 1.250. When converted into the
hydrometer reads 1.250. When converted into the
specic gravity at 20°C, the gure is 1.240, 0.040
specic gravity at 20°C, the gure is 1.240, 0.040
lower than the standard value. Normal charge is
lower than the standard value. Normal charge is
needed.
needed.
How to read hydrometer
How to read hydrometer
RUBBER BALL
RUBBER BALL
HYDROMETER
HYDROMETER
TEMPERATURE °C
TEMPERATURE °C
S
S
P
P
E
E
C
C
I
I
F
F
I
I
C
C
G
G
R
R
A
A
V
V
I
I
T
T
Y
Y
A
A
T
T
2
2
0
0
°
°
C
C
H
H
Y
Y
D
D
R
R
O
O
M
M
E
E
T
T
E
E
R
R
R
R
E
E
A
A
D
D
I
I
N
N
G
G
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