Use this step-by-step checklist to check the status of the battery.
 
Damages to the external surface (i.e. cracks) of the battery can cause leakage of battery fluid, which can cause corrosion in the car. A dirty battery surface can also cause discharge and therefore, should be kept as clean as possible.
 
 
Green: Battery is properly charged and ready for use.
Black: Battery is discharged. Charge the battery until the
  hydrometer turns green.
Clear: Low battery fluid. Inspect the charging system and replace
  the battery.
 
After turning off the car engine, the car should be allowed to rest for at least 1 hour before measuring the voltage.
 
Remaining Capacity (Percent of Charge) OCV
100 % 12.78 V
85 % 12.65 V
65 % 12.47 V
50 % 12.32 V
25 % 12.07 V
0 % 11.78 V

¡Ø The voltage (OCV) which it follows in remains dosage with general fact, is identical in the product of all types and it is not applied.

Visit the nearest dealer to check.
 
Check the color in the hydrometer.
Measure the voltage (OCV).
Check for additional corrosion, mileage.
Check the battery name, manufactured date.
Check for any damages on the battery surface.
Check the terminals.
Check the battery fluid level.