How Long Does Take to Charge a Car Battery at 2 Amps/10 Amps?

In situations where it becomes necessary to recharge an automobile battery, individuals often prefer to minimize waiting time. If an individual is in route to their workplace or has a scheduled engagement, they would likely want to avoid tardiness. Consequently, they may find themselves contemplating the duration required to recharge an automotive battery.

What is the duration required to charge a car battery at a current of 2 amperes? Alternatively, would it be more advantageous to utilize a charging rate of 10 amps? The process of charging an automobile battery is more complex than commonly perceived, and there exist several techniques that may be employed to expedite charging durations and preserve the overall well-being of the battery.

The following estimated durations might be anticipated as a general reference for the process of charging an automobile battery: The charging times for different chargers are as follows: a 2 Amp charger takes around 24-48 hours, a 4 Amp charger takes approximately 12-24 hours, a 10 Amp charger takes approximately 3-6 hours, a 20 Amp charger takes approximately 2-4 hours, and a 40 Amp charger takes approximately 30 minutes to an hour.

How Long Does It Take to Charge a Car Battery at 2 Amps or 10 Amps?

The rate at which your automobile battery charges is contingent upon the desired outcome. The optimal approach for maintaining battery health and prolonging its lifespan involves employing a long-term charging strategy with lower amperage, as opposed to quick charging which can lead to battery degradation over time.

Determining the appropriate amperage, either 2 or 10 amps, for charging a car battery is crucial in estimating the duration required for the vehicle to recharge. However, it is important to acknowledge that many additional elements are likely to influence the charging time as well.

It is generally advised against subjecting automobile batteries to quick charging currents above 20 amps, since doing so might result in detrimental effects on both the vehicle and its overall performance.

The optimal approach for charging at a slower rate involves utilizing a 2 amp charger, since this mitigates the potential for overcharging. However, if expediency is a priority, employing a 10 amp charger would be a more suitable alternative.

One may enhance their understanding of charging time by evaluating the ampere output of their automobile battery charger. Higher amperes result in a faster charging process, while lower amperes are recommended for optimal battery maintenance, but requiring more time.

Determine Your Charge Time

A typical battery charger has a current output ranging from 4 to 15 amperes. However, it is advisable to charge your battery at a rate below 15 amperes in order to optimize its longevity, since exceeding this threshold may potentially result in a reduced lifespan for the battery.

Determine Your Charge Time
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The determination of the appropriate charger to utilize is contingent upon the amp hour, a quantification of energy discharge often employed in batteries. Car batteries often possess a standard capacity of 48 amp hours, denoting their ability to discharge:

  • 1 amp per 48hrs
  • 2 amp in 24hrs
  • 4 amp in 12hrs
  • 8 amp in 6hrs

According to the above information, it can be inferred that a 2 amp charger has the capacity to supply a current of 2 amperes per hour to a depleted battery. Consequently, it would require a total duration of 24 hours to completely charge a standard 48 amp battery. In contrast, a charger with a current rating of 10 amperes would require slightly less than five hours to completely charge a conventional battery with a capacity of 48 amperes.

In order to obtain a more precise estimation of the duration required for charging, a technique exists that enables individuals to make informed decisions on the most effective approach. This method solely necessitates the utilization of a voltmeter.

1.  To determine the amp hours of your battery, see the manufacturer’s handbook or user manual associated with the battery. The battery’s amp hours may be determined by multiplying the reserve capacity by a factor of 0.6. As an illustration, if a battery has a reserve capacity of 100 minutes, multiplying this value by 0.6 yields 60, which represents the amp hours of the battery.

2. To identify the charge status of your car, measure its open-circuit voltage using a voltmeter and compare the obtained value with the reference list provided.

  • For AGM batteries: 12.80 to 12.90 – 100%, 12.60 – 75%, 12.30 -50%, 12.00 -25%, 11.80 -0%
  • For Flooded Lead Acid batteries: 12.60 to 12.70 – 100%, 12.40 – 75%, 12.20 -50%, 12.00 -25%, 11.80 -0%
  • For Gel batteries: 12.85 to 12.95 – 100%, 12.65 – 75%, 12.35 -50%, 12.00 -25% , 11.80 -0%


After assessing the battery’s charge state, one may calculate the required amp-hours for charging the battery, while considering the inclusion of around 20% of the necessary charge rate as supplementary amp hours.

For instance, while the battery is operating at a 50% charge level, it possesses a capacity of 30 amp hours. Consequently, an additional minimum of 30 amp hours is required to achieve a complete charge. The product of 30 amp hours and 0.2 (equivalent to 20%) yields a result of 6 amp-hours.

When the original value is combined with this additional quantity, the resulting sum is 36 amp-hours. The quantity of amp-hours required to charge the battery is shown. If a 10 amp charger were to be utilized, the calculation of 36 divided by 10 would get a result of 3.6, representing the number of hours required for the battery to reach a complete state of charge.




Is it better to charge a battery at 2 amps or 10 amps?

It is advisable to refrain from employing chargers with a current rating over 20 amperes for fast charging purposes, as this practice might result in detrimental consequences for the battery, hence compromising its overall performance. The utilization of a 10 amp charger for charging at a reduced rate is deemed satisfactory, however, a 2 amp charger is considered to be the optimal choice.

How long does a 10 amp charge take?

It may be inferred that a 10 amp charger will require a variable duration of time, ranging from 4 to 11 hours, contingent upon the desired level of battery charge. It is not necessary to await the complete charging of the battery prior to initiating the vehicle.

How long does it take to trickle charge 2 amps?

When charging your battery at a current of 2 amps, it is estimated to require around 24 hours to reach full capacity. Nevertheless, it is important to note that achieving a full charge is not a prerequisite for initiating the operation of your vehicle. The charging duration for a car using a 1 amp charger is estimated to be 48 hours. However, it is crucial to exercise caution and prevent overcharging of the battery.

How long should you leave a car running to charge the battery?

In order to ensure optimal battery charging and avoid the need for additional jump starts, it is advisable to drive for a minimum duration of 30 minutes after charging the battery and initiating vehicle movement. This allows sufficient time for the battery to recharge adequately.

Can you overcharge a car battery at 2 amps?

Continuous connection of a charger, even at a current of 2 amps, will result in the battery being subjected to overcharging. This phenomenon occurs due to the electrolyte’s elevated temperature, resulting in the generation of large amounts of hydrogen and oxygen gas.


.The duration required to charge a car battery at either a 2 amp or 10 amp rate is contingent upon several factors specific to each vehicle, including the battery’s present charge levels, its overall condition, and the specific type of battery employed in the vehicle.

The provided guidance and strategies may have facilitated the process of estimating the duration required for charging your car at either a 2 amp or 10 amp rate. Consequently, you should be able to resume your journey promptly, equipped with a fully operational vehicle battery.

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