How Long To Charge A Battery. The charging time heavily depends on the car battery and the chargers power output. Voltage reading should fall as the car tops off the battery the time it takes depends on battery state of charge about five to ten minutes is normal.
Voltage reading should fall as the car tops off the battery the time it takes depends on battery state of charge about five to ten minutes is normal. You should leave a trickle charger on a battery for 24-36 hours for a fully discharged battery or 12-18 hours for one that is half-dead. If the trickle charger is a smart charger it can remain connected without damaging the battery.
The amount of time it would take to charge would depend on the type of battery charger.
If you charge your car battery after a jump start it will take some time. For 12v batteries the first charge should be 18 hours with regular charging at. At idle the battery can take around 2 hours to charge up to 80 complete if it was flat and the alternator can generate 14 volts. You have to charge the battery per the amp specification and discharge value.
