Can You Jump Start an Electric Car A Complete Guide

No, you cannot jump start an electric car like a gas-powered vehicle because EVs rely on high-voltage battery systems that aren’t compatible with traditional jumper cables. Jump starting is unnecessary and potentially dangerous—if your EV won’t start, the issue is typically a depleted 12V auxiliary battery or main traction battery, both of which require specialized charging or professional assistance.

Key Takeaways

• Jump-starting isn’t needed: EVs use 12V batteries, not high-voltage systems, for auxiliary power.
• Charge, don’t jump: Use a charger or portable EV power bank to restore battery power.
• 12V battery issues: Dead 12V batteries can be jump-started like gas cars, but rarely.
• Follow the manual: Consult your EV’s guide before attempting any jump-start procedure.
• Call roadside help: Most EV manufacturers provide free towing or charging assistance.
• Prevent low battery: Regularly charge your EV and check 12V battery health.

Can You Jump Start an Electric Car? A Complete Guide

Picture this: you’re rushing to get your kids to school, and your car won’t start. The lights are dim, the dashboard is flashing, and your heart sinks. You grab the jumper cables, ready to help—only to realize the car in question isn’t your gas-powered SUV. It’s your brand-new electric car. Panic sets in. Can you even jump start an electric car?

You’re not alone. As electric vehicles (EVs) become more common, drivers are facing new questions about maintenance and troubleshooting. While jump-starting a traditional car is second nature to many, the idea of doing the same with an electric car can feel intimidating. After all, EVs rely on high-voltage battery systems, and the last thing you want is to cause damage—or worse, get shocked. The good news? Jump-starting an electric car isn’t as scary as it seems. But it’s not always the same process as with a gas car, either. This guide will walk you through everything you need to know: when it’s safe, how to do it, and what to avoid. Whether you’re a new EV owner or just curious, we’ve got you covered.

How Electric Cars Work (And Why It Matters)

To understand whether you can jump start an electric car, it helps to first know how these vehicles differ from traditional ones. At first glance, an EV might look like any other car, but under the hood—or rather, under the floor—lies a completely different system. Instead of an internal combustion engine, EVs use one or more electric motors powered by a large, rechargeable battery pack. This battery is the heart of the vehicle, and it’s what drives the wheels.

The Dual Battery System

Here’s a key detail most people don’t realize: electric cars have two batteries. The big one—the high-voltage lithium-ion battery—powers the motor and everything from the climate control to the infotainment system. But there’s also a smaller, 12-volt auxiliary battery, similar to the one in a gas-powered car. This little battery handles the basics: starting the car (yes, even EVs need to “start”), powering the dashboard, lights, and electronics when the main battery is off or low.

Think of it like a smartphone: the main battery runs the whole device, but there’s a tiny backup battery that keeps the clock and basic functions alive. In an EV, that 12-volt battery is what allows you to unlock the doors, turn on the radio, and boot up the car’s computer system. Without it, the car won’t even recognize the key fob.

Why This Matters for Jump Starting

Because the 12-volt battery is what powers the car’s electronics, a dead one can make your EV seem completely unresponsive. The car might not start, the lights won’t turn on, and the dashboard stays dark. Sound familiar? That’s exactly what happens when a gas car’s battery dies. The difference is, you can’t just jump the high-voltage battery. You need to revive the 12-volt auxiliary battery—and that’s where jump-starting comes in.

So, to answer the big question: yes, you can jump start an electric car. But only the 12-volt battery, not the main traction battery. And the process is slightly different than with a gas car, so it’s important to follow the right steps.

When You Might Need to Jump Start an Electric Car

It’s easy to assume that electric cars never need jump starting because they’re so advanced. But just like any vehicle, EVs can suffer from a dead 12-volt battery. And when that happens, the car won’t respond at all—no lights, no horn, no startup chime. Here are the most common reasons why your EV’s 12-volt battery might go flat.

Leaving Accessories On Overnight

We’ve all been there: you get home, plug in the car, but accidentally leave the headlights, interior lights, or even the infotainment system running. In a gas car, the alternator recharges the battery while driving, so a short stint with lights on usually isn’t a problem. But in an EV, the 12-volt battery isn’t recharged by an engine—it’s powered by the main battery through a DC-DC converter. If the car is off for a long time, that converter isn’t working, and the 12-volt battery can drain completely.

For example, my friend once left her EV parked for three days with the glovebox light on. When she came back, the car wouldn’t start. No response from the key fob, no dashboard lights—nothing. It looked like a dead main battery, but it was just the 12-volt battery that had drained.

Extreme Weather Conditions

Cold weather is tough on all batteries, and the 12-volt battery in an EV is no exception. In freezing temperatures, chemical reactions in lead-acid and lithium-ion batteries slow down, reducing their ability to hold and deliver charge. If you live in a cold climate, a weak 12-volt battery might not have enough juice to power the car’s systems after sitting overnight.

On the flip side, extreme heat can also degrade battery life over time. High temperatures accelerate the breakdown of internal components, shortening the battery’s lifespan. So, if you’ve had your EV for a few years and notice it’s slow to start, the 12-volt battery might be nearing the end of its life.

Infrequent Use

If you don’t drive your EV regularly, the 12-volt battery may not get enough charge. Even when the car is plugged in, the DC-DC converter only activates when the car is “on” or charging. If you leave the car parked for weeks at a time—say, during a vacation—the 12-volt battery can slowly drain, especially if there’s a small electrical load (like a security system or clock).

One EV owner I spoke to said her car wouldn’t start after being parked in her garage for six weeks. She thought the main battery was dead, but it was just the 12-volt battery that needed a jump.

Old or Failing Battery

Just like in gas cars, the 12-volt battery in an EV doesn’t last forever. Most are rated for 3–5 years, depending on usage and conditions. If your car is older or has been through extreme weather, the battery might not hold a charge as well. Signs of a failing 12-volt battery include slow startup, flickering lights, or the car taking longer than usual to recognize the key fob.

How to Jump Start an Electric Car (Step-by-Step)

Now that you know why a jump might be needed, let’s talk about how to actually do it. The process is similar to jump-starting a gas car, but with a few important differences. The key is to avoid the high-voltage system and focus only on the 12-volt battery. Here’s a safe, step-by-step guide.

1. Gather the Right Tools

You’ll need:

• Jumper cables (thick, heavy-duty ones—don’t use cheap, thin cables)
• A second vehicle with a working 12-volt battery (gas or electric—either works)
• Insulated gloves (optional but recommended, especially if you’re nervous)
• Owner’s manual (to locate the 12-volt battery and any jump-starting instructions specific to your model)

Pro tip: Keep a portable jump starter in your EV. These compact devices are designed to safely charge 12-volt batteries without needing another car. They’re a lifesaver when you’re stranded and no one’s around to help.

2. Locate the 12-Volt Battery

This is where things get tricky. In gas cars, the battery is usually under the hood. But in many EVs, the 12-volt battery is hidden—often in the trunk, under a floor panel, or even in the passenger compartment. For example:

• Tesla Model 3: The 12-volt battery is in the trunk, under the right-side floor mat.
• Chevrolet Bolt: It’s under the hood, but behind a plastic cover labeled “12V Battery.”
• Nissan Leaf: Located in the front trunk (frunk), but you may need to remove a panel.

Check your owner’s manual or search online for your specific model. Never assume it’s in the same place as a gas car.

3. Connect the Jumper Cables

Once you’ve found the battery, follow these steps:

1. Turn off both vehicles and set the parking brakes.
2. Connect the red (positive) cable to the positive terminal on the dead battery.
3. Connect the other end of the red cable to the positive terminal on the good battery.
4. Connect the black (negative) cable to the negative terminal on the good battery.
5. Connect the other end of the black cable to an unpainted metal surface on the dead car—like a bolt or bracket. This is the ground, and it prevents sparks near the battery.

Important: Never connect the black cable directly to the negative terminal of the dead battery. This can cause a spark and potentially ignite hydrogen gas, which batteries emit.

4. Start the Good Vehicle

Start the working car and let it run for 3–5 minutes. This gives the dead battery time to charge. Don’t rev the engine—just let it idle.

5. Try Starting the EV

Now, try to start your electric car. If the 12-volt battery has enough charge, the car should respond: lights will turn on, the dashboard will light up, and you’ll hear the startup chime. Once the car is “on,” the DC-DC converter will take over and keep the 12-volt battery charged.

If the car still doesn’t start, wait another 2–3 minutes and try again. Don’t jump it for more than 10 minutes—overcharging can damage the battery.

6. Disconnect the Cables

Once your EV is running, disconnect the cables in reverse order:

1. Remove the black cable from the ground point on the EV.
2. Remove the black cable from the good battery.
3. Remove the red cable from the good battery.
4. Remove the red cable from the EV’s battery.

Store the cables and drive your EV for at least 15–20 minutes to fully recharge the 12-volt battery. Or, better yet, plug it in to charge the main battery—this will also recharge the 12-volt system.

What NOT to Do When Jump Starting an EV

Jump-starting an electric car is safe when done correctly, but there are a few common mistakes that can cause serious problems. Avoid these at all costs.

Don’t Jump the High-Voltage Battery

This is the number one rule. Never try to jump the main traction battery. It operates at hundreds of volts—far more than a 12-volt system—and connecting jumper cables to it could result in:

• Electrical shock
• Fire or explosion
• Damage to the battery management system (BMS)
• Voided warranty

There’s no safe way for a layperson to jump a high-voltage battery. If the main battery is completely dead (which is rare), call roadside assistance or a professional technician.

Don’t Use a Traditional Jumper Box on the High-Voltage System

Some portable jump starters are designed for 12-volt systems only. But others claim to work on EVs. Be careful. If the device isn’t specifically labeled for EV use, don’t use it. Many EV-specific jump starters are designed to safely interface with the 12-volt system without risking the high-voltage components.

Don’t Ignore Warning Lights

If your car won’t start and you see warning lights like “Service Vehicle Soon” or “Battery Fault,” don’t assume it’s just the 12-volt battery. These could indicate a problem with the high-voltage system, the BMS, or the charging system. In this case, jump-starting won’t help—and it could make things worse. Call for help instead.

Don’t Jump Without Checking the Manual

Some EVs have special jump-starting procedures. For example, certain Tesla models have a “low voltage” port in the frunk that bypasses the need to access the battery directly. Other cars may require you to press specific buttons or follow a sequence before attempting a jump. Always check your owner’s manual first.

Preventing a Dead 12-Volt Battery (Pro Tips)

The best way to avoid needing a jump start? Prevent the 12-volt battery from dying in the first place. Here are some practical tips from real EV owners.

Drive Regularly

Even if you’re not going far, drive your EV at least once a week for 15–20 minutes. This keeps the 12-volt battery charged and the DC-DC converter active. If you’re away for long periods, consider using a battery maintainer (also called a trickle charger) designed for 12-volt batteries.

Check for Parasitic Drain

Some EVs have systems that draw power even when parked—like security cameras, remote monitoring, or scheduled charging. While these are usually minimal, they can add up over time. If you notice your car’s 12-volt battery dying often, check for any apps or features that might be using power in the background.

Use a Battery Monitor

Devices like the NOCO Boost Plus or Schumacher SC1299 can monitor your 12-volt battery’s voltage and alert you when it’s low. Some even connect to your phone via Bluetooth, so you can check the battery status remotely.

Replace the Battery Before It Fails

Don’t wait for a jump start to remind you the battery is old. Most 12-volt batteries last 3–5 years. If your EV is approaching that age, get the battery tested at an auto parts store. If it’s weak, replace it proactively. A new battery is much cheaper than a tow truck.

Keep a Portable Jump Starter Handy

As mentioned earlier, a portable jump starter is a must-have. Look for one rated for EVs, like the NOCO Boost X GBX45 or Jump-N-Carry JNC660. These are safe, reliable, and can save you in an emergency.

Data Table: Common EVs and Their 12-Volt Battery Locations

To help you find the battery quickly, here’s a quick reference table of popular EVs and where their 12-volt batteries are located.

Electric Car Model	12-Volt Battery Location	Special Notes
Tesla Model 3	Trunk, under right-side floor mat	Use the frunk’s low-voltage port for jump-starting
Chevrolet Bolt	Under hood, behind plastic cover	Labeled “12V Battery”
Nissan Leaf	Front trunk (frunk)	May require removing a panel
Ford Mustang Mach-E	Under hood, driver’s side	Accessible without tools
Hyundai Ioniq 5	Trunk, under floor panel	Check manual for exact location
Kia EV6	Trunk, under floor panel	Similar to Hyundai Ioniq 5

Final Thoughts: Yes, You Can Jump Start an Electric Car—But Do It Right

So, can you jump start an electric car? Absolutely. But it’s not about the main battery—it’s about the 12-volt auxiliary battery. And while the process is similar to a gas car, there are important differences: where the battery is located, how to connect the cables safely, and what not to do.

The key takeaway? Jump-starting an EV is safe when you follow the right steps. Use heavy-duty cables, connect to the 12-volt system only, and always refer to your owner’s manual. Keep a portable jump starter in your car, drive regularly, and monitor your battery’s health. With these tips, you’ll never be stranded with a “dead” electric car again.

Remember, electric cars are still cars. They have batteries, electronics, and quirks—just like any vehicle. But with a little knowledge, you can handle most issues yourself. And when you do need help, now you know exactly what to ask for. Safe driving, and happy charging!

Frequently Asked Questions

Can you jump start an electric car like a traditional gasoline vehicle?

No, you cannot jump start an electric car using the same method as a gasoline car. EVs rely on a high-voltage battery system and a separate 12V auxiliary battery for electronics, which requires a different approach if it dies.

What should I do if my electric car’s 12V battery dies?

If your EV’s 12V auxiliary battery is dead, you can use a portable jump starter or jumper cables connected to another vehicle’s 12V battery (not the EV’s main battery). Always follow the manufacturer’s instructions to avoid damage.

Is it safe to jump start an electric car using another EV?

Yes, but only to revive the 12V auxiliary battery—not the main traction battery. Connect the jumper cables to both EVs’ 12V terminals, ensuring correct polarity, and avoid touching high-voltage components.

Can a jump start fix a fully depleted main battery in an electric car?

No, jump starting won’t recharge an EV’s main traction battery. A fully depleted main battery requires professional charging via a Level 2 or DC fast charger, or a tow to a charging station.

What tools do I need to jump start an electric car safely?

You’ll need a 12V jump starter pack or jumper cables and a donor vehicle with a working 12V battery. Some EVs also recommend a dedicated 12V battery charger for long-term maintenance.

Does jump starting an electric car void the warranty?

No, jump starting the 12V battery won’t void your warranty if done correctly. However, improper handling of high-voltage components or using incompatible equipment may cause damage and affect coverage.