Specific Gravity Check

Use the chart below to correct your hydrometer reading according to electrolyte temperature.

Fig 1: Checking Specific Gravity

Courtesy of NISSAN MOTOR CO., U.S.A.

Hydrometer Temperature Correction

HYDROMETER TEMPERATURE CORRECTION REFERENCE CHART

Battery electrolyte temperature °C (°F)	Add to specific gravity reading
71 (160)	0.032
66 (150)	0.028
60 (140)	0.024
54 (130)	0.020
49 (120)	0.016
43 (110)	0.012
38 (100)	0.008
32 (90)	0.004
27 (80)	0
21 (70)	-0.004
16 (60)	-0.008
10 (50)	-0.012
4 (40)	-0.016
-1 (30)	-0.020
-7 (20)	-0.024
-12 (10)	-0.028
-18 (0)	-0.032

HYDROMETER TEMPERATURE CORRECTION REFERENCE CHART

Corrected specific gravity	Approximate charge condition
1.260 - 1.280	Fully charged
1.230 - 1.250	3/4 charged
1.200 - 1.220	1/2 charged
1.170 - 1.190	1/4 charged
1.140 - 1.160	Almost discharged
1.110 - 1.130	Completely discharged