# Frequent question: Can I charge a 12V 12ah battery with a car charger?

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## How long does it take to charge a 12V 12ah battery?

A 12-volt battery could take up to 12-24 hours to charge fully. When recharging your battery, remember that if it gets too hot while you’re charging it, you need to stop charging. It should not get too hot above 125 Fahrenheit. Ideally, slow charging your batteries is the best option.

## What is the charging current for 12ah battery?

For flooded lead-acid batteries, it is generally recommended that you not charge at more than 20 – 25% of the Ampere-hour rating – for your 12 Ah battery, that would be about 3 Amps.

## Can I charge my inverter battery with car?

You can charge a car battery with an Inverter. Most home Inverters are rated for 12 Volt batteries and have a charging circuit to recharge batteries at 13–14 Volts. Same is the case with Car batteries, they are rated at 12 Volts and recharged with Car Alternators providing 13–14 Volts.

## What is the maximum charge for a 12-volt battery?

Those batteries that are used in deep discharge cycling mode can be charged up to 2.45 volts/cell (14.7V for a 12V battery) to get the highest charge rate, as long as the voltage is dropped to the float voltage when the charge is complete. charged battery freezes about -72°C.

## How long will 12ah battery last?

The watts/volts are equal to the amps per hour. A tiny device such as led lighting of power 1.2 watts running on a 12volt power source will use 1.2W/12V = 0.1 amps. Therefore, a 12ah (amp-hour) battery will last for approximately 120 hours.

## Can you use a 12V battery while charging it?

You can not possibly use battery power while the charger is operating. The current will not go into the battery and then come back out of the battery to run the radio.

## 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%.

## What does 12v 12ah battery mean?

This is the maximum voltage output the battery can provide. The second is the Ampere-hour (Ah) rating of the battery which is 12 Ah for this particular battery. This means that if the discharge rate of the battery is given as 1 C (100% Capacity) Amps, the battery can provide a current of 12 Amps for 1 hour.

## What is the best current to charge a car battery?

Long-time charging with low amps is the best for keeping the battery’s lifetime long. Usually, a standard car battery charger is giving out 4-15 amperes. 2-4 ampere is typical for maintenance charging, and it will take around 24 hours to fully charge a dead battery at this load.

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## Can I use a DC power supply to charge a car battery?

No. If your power supply is well-regulated (with linear regulators or switched mode power supply), so that it outputs 12V at all load levels, the voltage is way too low. Common float charging voltages that can be left indefinitely on are 13.5V – 13.8V.

## How can you charge a car battery without driving?

Take a Lap (or Ten)

Car experts say that you want to drive around 30mph for around 30 minutes. This seems to be the most efficient way to get your alternator churning and cranking electricity back into your battery. I would also recommend turning off the radio and AC while you’re doing this.

## Can I charge a 12V battery with a 12V power supply?

A typical modern ATX supply of 450W can deliver 30amps at 12V. The problem with charging your car battery is that this 12V voltage is not high enough. You need a bit higher, like 13.8V to be safe; for quick charging during a few hours and manual disconnect, you can even use 14.5V.

## How do I know when my 12V battery is charged?

Fully charged automotive batteries should measure at 12.6 volts or above. When the engine is running, this measurement should be 13.7 to 14.7 volts. If you don’t have a multimeter to tell you the voltage of your battery, you can do a test of your electrical system by starting the car and turning on the headlights.