As electric vehicles (EVs) continue to grow in popularity, so do the questions surrounding their maintenance and roadside needs. One common concern is: can you jumpstart an electric car? While it might seem like a simple yes or no question, the answer depends on the type of battery and the problem at hand. In this guide, we’ll walk through the specifics of EV batteries, whether jumpstarting is possible, and what to do if your electric car won’t start.
Understanding Electric Car Batteries
To determine whether jumpstarting an electric car is possible, it’s essential to understand how EVs are built.
Electric vehicles come with two types of batteries:
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High-voltage traction battery – This powers the electric motor and allows the car to drive.
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12-volt auxiliary battery – This powers the car’s accessories and control systems (e.g., lights, infotainment, locking mechanisms, and ECUs).
Even though electric cars don’t have a petrol or diesel engine, they still need the 12-volt battery to function. If this battery goes flat, your EV may not start, unlock, or respond to the key fob—even if the main battery is fully charged.
Can You Jumpstart an Electric Car?
Yes—but only the 12-volt battery. You cannot and should not attempt to jumpstart the high-voltage battery, as it requires specialised charging systems and handling due to its high risk and complexity.
If your EV won’t start due to a dead 12V battery, you can jumpstart it similarly to a traditional petrol or diesel vehicle using jumper leads and another vehicle or a portable jump starter. However, extreme caution is necessary, and you should always follow the manufacturer’s instructions in your owner’s manual.
When Should You Jumpstart an Electric Car?
You might need to jumpstart your electric car if:
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The 12-volt battery has drained (e.g., left headlights on).
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The car has been unused for a long time.
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There’s been extreme cold weather, which can weaken the 12V battery.
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The battery is old or failing.
In these cases, the EV may show a blank dashboard, fail to start, or not even unlock—symptoms typically mistaken for major problems when the fix is relatively simple.
How to Jumpstart an Electric Car Safely
Before you attempt to jumpstart your EV, check the vehicle handbook to ensure the manufacturer permits it. Some cars like Teslas have dedicated jumpstart instructions, while others require professional assistance.
If it’s safe to proceed, follow these steps:
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Switch off both vehicles (yours and the donor car).
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Connect the red positive cable to the positive terminal of your EV’s 12V battery.
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Connect the other end of the red cable to the positive terminal of the donor car.
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Connect the black negative cable to the negative terminal of the donor car.
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Attach the other end of the black cable to a grounded, unpainted metal surface on your EV (not the battery itself).
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Start the donor vehicle and let it run for a few minutes.
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Try starting your EV.
Once started, remove the cables in reverse order and allow your car to charge the 12-volt battery through its internal systems (this may take around 20-30 minutes of running).
Can an Electric Car Jumpstart Another Car?
This is a different story. Most electric cars cannot be used to jumpstart other vehicles. They aren’t designed to deliver power from the 12V system to external sources. Doing so could damage the vehicle’s sensitive electronics or void your warranty.
Exceptions may exist in some plug-in hybrids or specialised models, but as a rule, don’t use your EV to jump another vehicle unless the manufacturer clearly permits it.
What If the High-Voltage Battery is Dead?
If your main EV battery is depleted, a jumpstart won’t help. In this case, your only option is to call roadside assistance or use a mobile EV charging service. Companies like the AA, RAC, or specialised EV rescue units can offer a top-up charge or tow your vehicle to the nearest charging point.
Always monitor your EV’s range, and never allow it to run completely flat unless absolutely necessary.
Prevention Tips for EV Battery Health
To avoid the need to jumpstart your electric car in the first place, consider these preventive measures:
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Drive your EV regularly to keep the 12V battery charged.
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Don’t leave the car sitting unplugged for extended periods.
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Park in a garage or covered space during winter months.
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Keep an eye on battery condition alerts on your car’s system.
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Replace the 12V battery every 4-5 years or as recommended.
Additionally, having a portable jump starter compatible with your EV is a wise investment for emergencies.
When to Call a Professional
If you’re unsure about jumpstarting or your EV still won’t start after trying, it’s safer to call a professional. Incorrectly jumpstarting an electric vehicle can cause costly electrical damage or personal injury.
EVs like the Nissan Leaf, Hyundai Ioniq, and Kia EV6 often have specific instructions—and in some cases, restrictions—regarding jumpstarting. Always consult your owner’s manual or contact your breakdown provider.
Final Thoughts
So, can you jumpstart an electric car? Yes, but only under the right circumstances—and only the 12V auxiliary battery. If your electric vehicle won’t start, knowing the difference between a drained 12V system and a flat high-voltage battery could save you time, stress, and repair costs. Always proceed with caution, use the right equipment, and follow your manufacturer’s guidelines. When in doubt, contact a qualified roadside assistance provider to safely handle the issue.
