# Question: How Long Does It Take To Charge A 12 Volt Battery At 1.5 Amps?

## How do you know if a 12v battery is fully charged?

There are two easy ways to tell when a battery is fully charged:While charging: Measure the current flowing into the battery.

If the current is very low, (<0.05C) the battery is nearly charged.

While Idle: Measure the terminal voltage, if it is equal to to around the max charging voltage, it should be fully charged..

## How many amps does a car battery need to start?

400 ampsThe Average Amps Required To Jump Start A Car. Before we dive into the specifics, you should know that the required amps to start most car engines is 400 amps. This is mainly for small and standard size vehicles. But in the case of SUVs, Trucks, and cars with bigger engines, you will need about 1000 amps.

## How many amps do I need to charge a 12 volt battery?

A medium amp output 12 volt charger would be in the range of 20 to 50 amps or so, and be used for many applications using about 100 amp hours of battery and up, or applications with a constant amp load (power supply application).

## Should I charge my battery at 2 or 6 amps?

In answer to your question, the six amp charger will charge your battery three times faster than the two amp charger. Six amps is stil a relatively slow charge and should be fine to use for a deep cycle battery. If your charger is telling you the battery is full, place a load on the battery before charging it.

## Can you leave a battery charger on overnight?

Even though there is no risk of overcharging with the use of a high quality charger, the battery should not remain connected to the charger for more than 24 hours. A full charge is usually achieved by charging overnight. Even after a deep discharge, some chargers enable at least partial reconditioning of the battery.

## Can you start a car with a trickle charger on it?

If all you want to do is charge the battery, then a normal trickle charger should do just fine. … If you try to start your car while a trickle charger is connected, your car will try to draw power from it. A car engine needs 400+ amperes to start, which a simple trickle charger cannot provide.

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

A 12 volt / 10 amp 3-stage automatic charger is the best charger for most automotive batteries. Unfortunately most chargers do not output the entire 10 amps during the charge cycle, because it automatically limits the voltage and the amperage during the charge cycle.

## How long should I trickle charge my battery?

A trickle charger usually operates at around 2 amps and it is going to take a long time to charge up your 12 volt car battery (read our full guide here). It can take as long as 24 hours to get the battery up to an acceptable charge, depending on how depleted your battery is when you start charging.

## How long does it take to charge a 12 volt battery at 15 amps?

If we were recharging the battery with a 15-amp battery charger, the recharge time would be roughly 3.6-hours.

## Can you overcharge a car battery at 2 amps?

A: If you leave the charger connected continuously, even at a mere 2 amps, the battery eventually will die. Overcharging a battery causes excessive gassing — the electrolyte gets hot and both hydrogen and oxygen gas are generated. … On sealed batteries, the buildup of gases could cause the battery to burst.

## Can you overcharge a battery?

It’s complicated, as leaving your battery plugged in all night certainly isn’t dangerous but it might make your battery age slightly faster. “Overcharging” is the term that gets thrown around a lot with this one. … This did, in fact, cause damage to the battery and reduce performance. Hell, it even led some to explode.

## Can you overcharge a 12 volt battery?

A 12V lead-acid battery will not be damaged by overcharge if the voltage is kept low enough to avoid electrolysis, and the charging current is kept below 0.2C (5 times less than the Ah capacity). … If it can put out more current than the battery can take then the battery may overheat.

## How long does it take to charge a 12 volt battery with a 10 amp charger?

In order to determine how long it’ll take for you to charge your battery, you need to know your battery’s reserve capacity and your charger’s output charge current. A 100aH battery that is being charged by a 10A charger will be fully charged in 10 hours.

## How long can you leave a 10 amp charger on a battery?

If you are using a battery charger, a 10 amp charger will take 4 to 11 hours to fully charge the battery, a 2 amp charger will take 2-4 days. Of course you don’t have to get the battery to full charge to get it to start the car.

## How do you know when a 12 volt battery is fully charged?

A fully-charged 12-volt battery, allowed to “rest” for a few hours (or days) with no load being drawn from it (or charge going to it), will balance out its charge and measure about 12.6 volts between terminals. When a battery reads only 12 volts under the above conditions, it’s almost fully depleted.

## What happens if you leave a battery charger on too long?

A: If you leave the charger connected continuously, even at a mere 2 amps, the battery eventually will die. Overcharging a battery causes excessive gassing — the electrolyte gets hot and both hydrogen and oxygen gas are generated. … On sealed batteries, the buildup of gases could cause the battery to burst.

## How long does it take to charge a car battery with a 12 volt charger?

Yes, batteries take time to recharge. It could take hours. 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.

## How long does it take a 6 amp charger to charge a 12 volt battery?

The voltage rose slowly and steadily and then flattened out at around 13.4V with the current dropping as well, after about 20 hours. (The battery voltage will be higher when the charger is connected and drop back a little when the charger is disconnected. This is to be expected.

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

Consequently, when trying to charge a larger battery at that rate, it will take a very long time and the battery may discharge at a greater rate than the 2-amp charge can provide. It is better to charge a deep cycle battery at a higher charge rate like 6-amps, 10-amps or higher.

## Can a completely dead battery be recharged?

A car battery is considered discharged when the voltage drops below 12 volts. While your vehicle’s alternator can keep a healthy battery charged, it was never designed to completely recharge a dead car battery. … These charging devices are designed to safely restore a dead battery to full charge.

## Does amperage matter when charging a battery?

It doesn’t matter if the power supply / charger can provide more current then the device requires. Providing less current will prevent charging or slow it down the same as a poorly designed charger can also prevent charging or slow it down.