Quick Answer: Can you charge a 12v battery with a car?

Q: How long does it take to charge a 12V car battery from flat? A: Charging time depends on the battery and the charger. For a battery being charged by the car’s alternator it can take an hour of driving to get it fully charged. Car batteries range from 40AH to 110AH, and alternators range from 45 amps to 200 amps.

How long does it take to charge a 12V battery with a car?

How long does it take to charge a car battery with a 12 volt charger? Car batteries usually hold 48 amps, so it will take about 12 hours to reach a full charge using a 12 volt charger. It takes around 30 minutes for an electric vehicle to charge to 80%.

Can you charge a 12V battery with jumper cables?

Jumper cables can supply power via a functional battery from another car. Keep a set in your vehicle. Connecting your car’s battery to another car’s battery with jumper cables is a common way to recharge a battery. … Attach one black clip of your jumper cables to the negative terminal of the car with the working battery.

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Can you charge a battery with a car?

If the battery in your car is dead, it can be a big inconvenience. There are two simple ways to recharge the battery: using a battery charger or using a running car battery.

Can a completely dead battery be recharged?

While your vehicle’s alternator can keep a healthy battery charged, it was never designed to completely recharge a dead car battery. … With a seriously depleted battery, your best option is to connect it to a jump starter or a dedicated battery charger either before or immediately after a jump-start.

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

It is best to slow charge the battery. Slow charging rates vary depending on the battery’s type and capacity. However, when charging an automotive battery, 10 amps or less is considered a slow charge, while 20 amps or above is generally considered a fast charge.

Does revving engine charge battery faster?

But when your engine turns faster, the engine’s alternator also turns faster. … That way, all of the alternator’s power can be directed to recharging the battery. Once the car starts, you can rev it up to charge the battery faster, but the best way to do that is to just drive it.

Can I start car with battery charger attached?

Yes you can start your car when hooked to Tender. Care must be taken to make sure that the cable are clear of all moving parts under the cars hood. Keep in mind that the tender will not jump start a car and if the battery is too drained it will not charge it.

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Can you leave jumper cables on too long?

Jumper cables: You should always keep a handy pair of jumper cables in your car. They can come in varying lengths, normally 10-20 feet. While longer cables can reach farther, you risk losing power as the energy travels along the extra length. Ensure that the cables you use are not rusted, frayed or damaged.

How do you charge a 12V battery with a 12 volt adapter?

Your 12v adapter would only be able to raise the battery voltage to 12v, but to charge a car battery fully you would need to raise the voltage to 13.8v. The 16v adapter would raise the voltage too high and could cause damage.

How do I know if my 12-volt battery is bad?

A healthy 12 volt motorcycle battery should maintain a range from 9.5 – 10.5 volts under the load for a good 30 seconds straight. If the battery begins to hold and then steadily drops in voltage, there is a problem. If the voltage instantly drops to 0 volts, that is also a problem.

How long does a car have to run to charge a dead battery?

The general consensus is you have to drive the car at least 30 minutes to put any meaningful charge on it. This is not to say that driving for 30 minutes will fully re-charge your battery. There are several factors to consider.

How long does it take to charge a car battery using jumper cables?

The easiest way is to connect + red cable to the big wire bolted to the alternator then attach the other end to the battery + positive while the car is running. Charge the dead battery at least 20 min.

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Can you jump a battery that’s not in a car?

Some MacGyvers in the audience may swear the battery-on-battery method (don’t ask) is perfectly safe, but if your automatic-transmission car’s battery is dead, and you’re without jumper cables, you’ve got two options: grab the portable jump-starter you’ve got stowed in your car, or call a tow truck or the AAA for …