Charging Time Required

Notice: The ignition switch must be off when connecting or disconnecting battery cables or chargers. Failure to do so may overstress or damage the ECM or other electronic components.

The time required to charge a battery will vary dependent upon the following factors:

^ Ampere Size of Battery - A completely discharged large heavy-duty battery requires more than twice the recharging as a completely discharged small passenger car battery.

^ Temperature - A longer time will be needed to charge any battery at 0 degrees Fahrenheit than 80 degrees Fahrenheit. When a fast charger is connected to a cold battery, the current accepted by the battery will be very low at first, then in time the battery will accept a higher rate as the battery warms.
^ Charger Capacity - A charger which can supply only five amperes will require a much longer period of charging than a charger that can supply 30 amperes or more.

^ State-Of-Charge - A completely discharged battery requires more than twice as much charge as a one-half charged battery. Because the electrolyte is nearly pure water and a poor conductor in a completely discharged battery, the current accepted by the battery is very low at first. Later, as the charging current causes the electrolyte acid content to increase, the charging current will likewise increase.