Specific Gravity Check

NOTE:

Check the charge condition of the battery.

Periodically check the specific gravity of the electrolyte. Keep a close check on charge condition to prevent over-discharge.

Read hydrometer and thermometer indications at eye level.

Fig 1: Checking Specific Gravity
Courtesy of NISSAN NORTH AMERICA, INC.

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

HYDROMETER TEMPERATURE CORRECTION

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

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