# How Long Will A Car Battery Power LED Lights?

## Can I connect a LED directly to a battery?

LEDs emit light when an electric current passes through them.

The electrical behaviour of an LED is quite different from a lamp and it must be protected from passing excessive current, usually this is achieved by connecting a resistor in series with the LED.

Never connect an LED directly to a battery or power supply..

## How long will a 100 Ah battery last?

Below: A simple example, but heavy user of power is a 12 volt hair dryer rated at 10 amps. A 100 ah battery should give you (100/10=10) 10 hours of usage. If you use it for 5 mins a day, it could last 120 days.

## How long will a car battery last with a 1 Amp draw?

A battery with a capacity of 1 amp-hour should be able to continuously supply current of 1 amp to a load for exactly 1 hour, or 2 amps for 1/2 hour, or 1/3 amp for 3 hours, etc., before becoming completely discharged.

## How long will a car battery last with lights on?

Now a battery’s amp-hour capacity diminishes as the amperage draw increases, so you’re looking at more realistically between 4 and 7 hours. In terms of how long until you can’t start the car, assuming the car battery is fully charged probably 45 to 90 minutes.

## How many LEDs can a 12v battery power?

The answer should be the source voltage divided by the voltage drop of 1 LED. So if your source is 12v, and your LEDs have a voltage drop of 3.5, 12/3.5v, gives you 3 LEDs. If the the forward voltage drop of the LEDs was exactly 3 volts, you’d be able to drive 4 of them, and would not need a current limiting resistor.

## How many amps will kill a car battery?

0.10 amps will kill your battery quick like, you should get it down as close to 0.00 amps as possible. My experience was that to keep the radio stations, etc. it takes about 0.01 amp on the meter.

## How many amps should a car battery draw when off?

Fifty milliampsMost vehicles draw some battery current when the key is off, thanks to the clock and the internal memory of engine computers, body-control modules, and radio presets. Altogether, they draw a very small amount of current. Fifty milliamps would be a safe upper limit for this, though many vehicles will draw less.

## Can you run LED lights off a car battery?

Most LED lights are arranged so that they can run off of a 12v battery—in fact, 12v lights can cause a short when plugged directly into a socket, which usually have 110v current. This can be very dangerous, and so the best solution is to run these lights through a relay instead.

## How long can LED lights run on a battery?

Microdrop LED lights constructed on thin uncoated wire should last over 100 hours with a fresh set of 3 AA batteries or 2 round C-style batteries and standard LED battery light sets with thicker insulation and LED lenses should last about 18-24 hours on a set of 3 AA batteries.