Lucky I have fitted a battery meter, a good battery will show reading of 12.0 -12.3V but this time it recorded 10.02V..this means the battery is weak.
I know the cause...my Elantra has not been doing good daily running and frequent starting. Daily travel about 22-30km only.. on weekend the car even travel lesser.
Removed both terminal and hook up to my battery charger. I hope 6 hours of charging is sufficient. If were to perform recondition charge..it will take about almost to 3 days.