# How Can I Charge My Battery Without A Charger?

## How do you trick a battery into a charger?

If you take a pair of jumper cables and connect a good battery to the bad battery in parallel (+ to +, – to -) and then connect the charger to the good battery, it will trick the charger into seeing a good voltage, and charge both batteries..

## Can a completely dead battery be recharged?

Many batteries can indeed be recharged, even when we think they are completely exhausted. In fact, a lot of batteries can last four to seven years before they are too weak to start the car, Jerew added. It’s not just poor driving habits that take down a battery. Even a smart defensive driver can do it.

## Can I start car with battery charger attached?

Originally Answered: Can you start a car with a battery charger connected? Yes. It won’t hurt the charger, the battery or the car.

## How long does it take to charge a completely dead car battery?

Recharging a dead car battery can take at least 4 hours, and even up to 24 hours depending on the power of the charger and the size of the battery. Usually, battery chargers put out around four amps, but there are more powerful chargers out there.

## Can I use a 5v charger with a 3.7 V battery?

Generally, a 3.7V lithium battery needs an overcharge and overdischarge protection circuit board. … Lithium battery with protection circuit board can be charged with 5V voltage(4.8V to 5.2V can be used). For 3.7V lithium batteries, the charge cut-off voltage is 4.2V and the discharge cut-off voltage is 3.0V.

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

12-24 hoursA 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.

## Can you charge a 12v battery with a 19v charger?

NO you cannot charge your 12V AGM battery directly with a 19V Laptop power supply. You need a battery charger. … So your fully charged state is about 13.8 – 14.5V. Putting two batteries in parallel does not change the voltage required to charge them it simply increases the current capability (increased Ah rating).

## Can you charge a cell phone with a 12 volt battery?

You can probably charge a phone faster with a 12 V car battery than with a 5 V power adapter. … The adapter has to provide charging current at a wanted voltage. However, that voltage can’t be too different from the battery’s because Ohm’s Law.

## How do you jumpstart a car without another car?

Here’s How to Start a Car With a Dead Battery Without Another CarDirect your friends to the rear of the car and have them get ready to push.Hop into the driver’s seat and turn the ignition to “on.”With the parking brake still engaged, push the clutch in and shift to second gear.More items…•

## How can I charge my car battery without a charger?

How to Charge an Auto Battery Without a ChargerKeep an auto repair kit in your trunk. … Take the jumper cables out of the kit. … Keep your cell phone charged in case of emergency. … Turn your keys to the “off” position. … Place your negative jumper cables on the battery terminals. … Place the other pair of jumper cables on the red, positive terminals of each car.

## How do you charge a 3.7 V battery without a charger?

Charge a Li-ion Battery Using USB PortGet a USB cable similar to a smartphone charger.Connect the USB end to your laptop, PC, printer, camera, power bank or any other electronic device that allows the USB port.Now, take your gadget and connect the charging end of the cable to your device that you want to charge.More items…•

## Is it safe to leave a car 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.

## Does revving the engine charge the battery?

Revving the engine will charge the battery faster because the alternator increases this amperage. When you rev the engine, the alternator begins to run faster, which helps charge the battery.