# You asked: What is acceptable current drain on car battery?

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A normal amount of parasitic draw for newer cars is between 50-milliamp to 85-milliamp current draw. A normal amount of parasitic draw for older cars is a reading less than 50-milliamp. Anything past these amounts indicates an electrical issue and should be addressed by a mechanic.

## How much battery drain is acceptable?

In fact, we suggest a 25-milliamp draw is acceptable and anything that exceeds 100-milliamps indicates an electrical issue that needs to be addressed.

## How much current should my car draw when off?

The acceptable current draw should be around 0.03Amps. If that can’t be achieved upto 0.075-0.1 can be acceptable if the vehicle is driven most days.

## How many amps can you draw from a car battery?

Even though most car batteries are only 6 or 12 volts, a 12-volt battery can produce as much as 600 amps. Amperage can be thought of as the volume of electricity that’s generated, but voltage can be thought of as the “pressure” of the electricity.

## How much should a car battery drain overnight?

It shouldn’t lose any (measurable) voltage. You may get an ever so slight decrease if the temperature drops substantially. Otherwise, If it does, you either have a parasitic draw or a weak battery. If its a new battery with a good charging system 12.8 to 12.6 is what you should expect.

## How many amps does it take to start a car?

400 to 600 amps will be more than enough to jump-start any normal, consumer vehicle. Commercial vehicles may require up to 1500 or 2000 amps. Compact and small vehicles can be boosted with as little as 150 amps.

## How do you calculate battery drain?

It is an usual calculation. Discharging: Example: Battery AH X Battery Volt / Applied load. Say, 100 AH X 12V/ 100 Watts = 12 hrs (with 40% loss at the max = 12 x 40 /100 = 4.8 hrs) For sure, the backup will lasts up to 4.8 hrs. Discharge rates are well enough covered here.

## How many amps does a car use at idle?

Typical Current Loads for Automotive Systems, Lighting and Accessories: Engine Idling (no lights or accessories on) – 35 to 50 amps.

## How many amps should a 12-volt car battery have?

Car batteries will typically have a capacity of 48 amp hours. What this means is a fully-charged 12-volt car battery rated at 48 amp hours can deliver 1 amp for 48 hours or 2 amps for 24 hours. This also means the battery can supply 8 amps for 6 hours under ideal operating conditions.

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

A 12-volt automotive battery, for instance, takes a while to charge. In fact, fast charging for this kind of battery is not recommended. 10 amps are the recommended current.

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## How many cold cranking amps should a car battery have?

The standard recommendation is a battery with at least one Cold Cranking Amp (CCA) for every cubic inch of engine displacement (two for diesels). CCA rating is an indication of a battery’s ability to deliver a sustained amp output at a specified temperature.

## How much voltage drop is acceptable car battery?

You can test for proper cranking voltage with a voltmeter while—you guessed it—cranking the engine. The several hundred amperes of current the starter motor draws should pull the battery voltage down to a normal 9 to 10 volts. Do this test: Disable the ignition or injection to prevent the engine from starting.

## How many volts should a fully charged 12v battery read?

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.

## How many volts should a battery drop overnight?

If you measure the voltage immediately after the end of a drive, it should be more like 13.2, and drop to 12.7 within a few minutes as the chemical reactions in the battery slow down and stop when you stop charging it.