Can a car battery be recharged?

Yes, you can surely recharge a rechargeable battery with a good quality battery charger. Recharging a battery is quite simple unless and until the battery is not dead or flat or fully exhausted. Recharging a dead or flat battery can be tricky and challenging and depends upon the battery health and condition. If the battery is very old and severely damaged then you won't be able to recharge it and have to replace it with a new one. 

Can a car battery be recharged by driving?

It might be surprising for you that driving a car can recharge its battery. It seems like a weird deal but it actually happens, if you are wondering how then keep reading. When a car battery is drained out, it refrains the car from starting and causing trouble for you. Luckily we have ways to force start the car and jump start is one such way. But jump-start merely helps to push the battery to start the car, while the battery still remains drained out so how does the car still get you to your destination with a drained battery? 

A drained car battery can slow down the progress on the road even when started forcefully. Here comes the alternator to rescue. The alternator is the device or equipment that charges the battery of the car while you are driving on road. Jumpstart only forces the battery to buckle up and aids in the ignition, but to keep moving on the road you need to fully charge your battery and the alternator makes sure to do so to ensure that you enjoy a smooth ride with no chance of battery exhaustion. 

The alternator converts the mechanical energy of the engine into electrical energy that not only helps to charge the battery but also supplies power to the electric components and systems of the car. 

To recharge the battery with driving, you need to drive the car at more than 1000 RPM continuously for a considerable time. The time depends upon the charged state of the battery. A battery that has been exhausted for a while will require more time to fully charge. Usually, at least 30 minutes drive is necessary to start charging the battery. If you intend to fully charge the battery then you will have to drive the car for almost an hour and that too with keeping the electric systems off so that the electric energy produced by the alternator directly goes to charge the battery. Another trick to recharge the battery while driving is by idling. Revving the car also tends to speed up the battery charging process by enhancing the electric current flow to your battery. 

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Although the alternator does help to charge the battery as explained below the ability to completely charge the battery depends upon the age of the battery, charged state of the battery, and the extent of electric consumption by the electric system of the car. 

Can a car battery be recharged after sitting for a year?

To understand the dynamics of car battery recharging that is been sitting for a year, you need to understand what sitting actually means. Sitting here refers to the fact that the car is not in use for a year with the battery still installed in the car. In other words, the car is idle with the battery inside. In such a case, the battery will start to drain after merely a week and will be completely exhausted in just a few weeks. This is so because even when the car is sitting idle, the electric components and systems installed in the car get the energy from the battery such as GPS, etc. In addition, the self-discharge of batter also plays a huge role in exhausting the battery. 

You can surely try to recharge the battery in such a condition when it has been still sitting after being exhausted for a while. To recharge the battery you will have to jump start the engine to offer an external electric supply to power up the battery. It might be possible that the jump start fails and even after a successful jump starts the battery still doesn’t accept the charge. It is because the recharge capability of the battery depends upon a number of factors such as the battery's health, age, and condition. 

If the battery is quite old (more than 3 years), damaged or has poor health ( due to poor maintenance and poorly managed charge/discharge cycle) then it is highly unlikely that the battery will recharge. A battery that is in poor condition will not accept charge and even if it does it won't be charged to its 100% capacity. In such a case, you might have to replace the battery and give up on your old or current battery. 

Can a car battery be recharged after a year?

If you are wise enough to unassemble the battery of a car that you are not going to use for a while and store it in perfect storage conditions then the battery condition will be much better than it is in a sitting condition. In such a case, the battery will last for about 6 months. Although it is advised to recharge the stored battery once in a while (at least once in 12 weeks), if you haven’t recharged it for a year still then it is possible to recharge the battery.

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You can recharge the battery after a year with a jump start or an external charger. But the recharge capability of the battery depends on several other factors such as battery health, condition an age. If the prospects are favorable then you will be able to charge the battery and enjoy using it, but if the prospects are unfavorable (old and damaged battery with poor maintenance) then it will not be recharged to its full capacity. But even if you can recharge the battery to 70% of its full capacity still then it is good to power up your car.