Electric and hybrid vehicle safety: a practical guide for families
How to charge safely, spot battery warning signs and act after a crash or flood
Picture a family whose electric SUV is rear ended at a red light. No one is hurt. The car still powers on. The tow driver offers to leave it in their garage overnight. An EV emergency response specialist would politely say no.
EVs and hybrids must meet federal safety standards, including rules for their high voltage systems [5]. Still, a damaged lithium ion battery behaves differently from a gas tank. NHTSA warns that physical damage can lead to toxic or flammable gases and fire, either right away or later [1]. The agency has also overseen several recalls tied to vehicle and house fires caused by EV battery problems [2].
This guide explains how the high voltage system works, how to charge safely and what to do when something goes wrong.
How the high voltage system works
NHTSA describes three common types of electrified vehicles [1]:
Comparison compiled by Safety Behind the Wheel Foundation
| Type | What powers it | Plugs in? |
|---|---|---|
| Hybrid (HEV) | A gasoline engine plus an electric motor and battery | No |
| Plug in hybrid (PHEV) | Hybrid parts plus a bigger battery, typically good for 20 to 70 electric only miles | Yes |
| Battery electric (BEV) | Electricity only | Yes |
All of them have two electrical systems. A high voltage battery pack runs the drive motor through thick cables, usually bright orange so rescuers can spot them. A separate 12 volt battery runs lights and gauges. A converter keeps it charged from the big pack [1].
The high voltage battery can’t be jump started. But in most cases the 12 volt battery can, much like a gas car’s [1]. If the 12 volt battery dies, electronic door buttons and screens may stop working. Look up your manual door release today, before you need it.
Built in protection, and its limits
Federal Motor Vehicle Safety Standard (FMVSS) 305 covers passenger vehicles rated up to 10,000 pounds that use more than 48 volts to move [5]. After crash tests, the high voltage system must still protect people from shock. It can stay electrically isolated from the car’s metal body, drop to a low voltage or stay behind protective barriers [5].
The battery must also stay in its mounts. The car can’t drive itself away while a charger is plugged in [5]. Many vehicles have automatic disconnects that cut high voltage at the battery pack [5].
EV safety engineers stress one limit. A disconnect can isolate the cables, but the cells inside the pack keep their energy, which responders call stranded energy. That’s why NHTSA says to treat a damaged battery as fully charged [1].
Charging safely at home and on the road
NHTSA’s charging rule is simple: follow your owner’s manual and the automaker’s instructions [1]. Charging in the rain is fine, because plug in chargers are built to resist weather [1].
Comparison compiled by Safety Behind the Wheel Foundation
| Charging level | Power source | Range added per hour | Typical place |
|---|---|---|---|
| Level 1 | Standard 120 volt household outlet | About 2 to 5 miles | Home |
| Level 2 | 240 volt home service (208 volts at many businesses) | About 10 to 20 miles | Home, work, public lots |
| DC fast charging | High power direct current | About 180 to 240 miles | Highway and public stations |
Source: U.S. Department of Transportation (USDOT) [6].
A 10 hour overnight Level 1 charge adds roughly 20 to 50 miles (our calculation). Most plug in hybrids can’t use fast chargers [6].
A charger draws heavy current for hours, so a worn outlet or loose connection has time to overheat.
At public chargers, skip any station with a cracked handle or exposed wires. Report it through the network’s app.
Warning signs of battery trouble
A lithium ion cell that is crushed, punctured, overheated, overcharged or soaked can heat up and set off its neighbors. Engineers call this chain reaction thermal runaway. NHTSA is studying it for future safety standards [2].
Failing cells often give off gases first. In NHTSA research that overcharged lithium ion cells and packs, gas sensors were the most responsive warning, especially in larger packs, which vented quickly [3]. You can’t see or smell every gas, so take every sign seriously.
A battery warning light with none of those signs is different: pull over safely, check your manual and call roadside assistance or your dealer.
After a serious crash: what occupants should do
Most crash steps are the same in any car. Our guide to post crash care covers first aid and calling for help. Add these EV and hybrid steps:
- Power down if you can do it quickly. Shift to Park, set the parking brake and press the power button. A running EV makes no engine sound, so responders can’t tell by ear whether it could move.
- Get out at any sign of trouble. Smoke, sparks, hissing or a chemical smell means everyone leaves through any safe door and moves far away and upwind, since damage can release toxic gases [1].
- Call 911 and say what you drive: an EV, plug in hybrid or hybrid. Describe any smoke, leaks or noises.
- Keep hands off orange cables and leaks. NHTSA warns that exposed wires can shock and battery materials are highly corrosive [1].
- Leave any battery fire to firefighters. Your job is to get people clear.
- Tell the tow operator that it’s an electrified vehicle that was in a crash.
- Call your dealer or automaker, even if the car seems fine, as NHTSA advises [1].
- Keep watching the parked car. A fire can start later, so watch for warning signs until a qualified technician clears it [1].
Towing and storage after damage
NHTSA notes that EVs and hybrids can be damaged if towed with their drive wheels on the ground, because those wheels connect to an electric motor [1]. Read your manual’s towing page now, and when in doubt, ask for a flatbed.
When you call for a tow, give the year, make and model. Mention any crash or flood damage. Ask for outdoor storage at least 50 feet from buildings and other vehicles [1]. Repeat that request in writing to the body shop or tow yard.
Floods and submersion
If your car ends up in water, escape as from any vehicle: seat belt off, window open, get out (see our rain and flood guide). Act in the first seconds, before rising water can disable power windows. Keep a window breaking tool within the driver’s reach.
Afterward, the battery becomes the concern. NHTSA notes that these batteries contain highly corrosive materials, and that floodwater can create shock hazards and, in turn, a fire risk [1].
Quiet cars, quick launches and pedestrians
People walking near hybrids and EVs at parking lot speeds often can’t hear them. FMVSS 141 covers hybrid and electric passenger vehicles up to 10,000 pounds, plus low speed vehicles [4]. NHTSA wrote it under the Pedestrian Safety Enhancement Act of 2010 to protect pedestrians, especially people who are blind or have low vision [4].
These vehicles must meet sound requirements while standing still, backing up and moving at up to 30 km/h, about 18.6 mph (our conversion) [4]. Faster than that, tire and wind noise do more of the work. Models built before the rule took full effect may be nearly silent at low speed.
The alert sound is a backup, not a promise. Children, people wearing earbuds and people with hearing loss can still miss it. In 2024, 7,080 pedestrians were killed and more than 71,000 injured in U.S. traffic crashes [8]. NHTSA urges drivers to look out for pedestrians everywhere and take extra care when backing up [8].
Instant torque. An electric motor delivers strong pull the moment you press the pedal. In driveways and parking lots, a light press can move the car faster than gas car habits expect.
One pedal feel. Lifting off the accelerator lets the motor slow the car while capturing energy, called regenerative braking [1]. The regular brakes still handle emergency stops and do more of the work when the battery is full [1]. Teens and drivers new to EVs should practice in an empty lot first.
Weight. Battery packs are heavy, so many EVs weigh more than similar size gas models. NHTSA’s research review notes that vehicle weight, size and power raise the risk of death and injury when a pedestrian is struck [9]. In IIHS’s latest death rate study, 10 of the 20 models most deadly to drivers of other vehicles were large or very large pickups [10]. More mass means more energy to manage. So leave extra space and keep tires matched to the vehicle, as our maintenance guide explains.
Manufacturer emergency information and recalls
Treat your owner’s manual as your emergency file. Read the sections on towing, jump starting, charging, flooding, warning messages and the manual door release. Save the roadside assistance number in your phone.
Automakers also publish emergency response guides for firefighters and tow crews. These show where high voltage parts, disconnects and safe cut points are. Some vehicles carry a rescue sheet label or code that links to them. Give responders your exact year, make and model so they can find the right guide.
Battery defects do lead to recalls, including ones tied to vehicle and house fires [2]. Check your vehicle identification number (VIN) on NHTSA’s recall site [11]. Follow any “park outside” order right away. Our guide to recalls and safety defects explains each notice. Report unusual battery behavior to NHTSA online or at 888-327-4236 [12].
Why damaged EVs need trained responders and technicians
A damaged high voltage battery stacks several hazards: shock from exposed parts, corrosive materials, toxic or flammable gases and a fire that may start later [1]. Switching the car off doesn’t remove them, because the energy is still in the cells [1].
NHTSA says EV service calls for a technician with EV specific high voltage training, protective gear and proper testing tools [1]. It warns that untrained work can cause severe injury or death [1]. Ask any body shop whether its technicians are trained on your brand’s high voltage system.
Firefighters face the same hazards, which is why trained crews work from automakers’ guides and why telling 911 what you drive matters.
Frequently asked questions
Is it safe to charge an electric car in the rain?
Yes. NHTSA says plug in chargers are weather resistant [1]. Don’t charge with a damaged cord or plug, or after the car has been flooded.
Can you jump start a hybrid or electric car?
In most cases you can jump the 12 volt battery like a gas car’s, but never the high voltage battery [1]. Use the jump points shown in your owner’s manual.
Do electric cars catch fire more often than gas cars?
Any vehicle can catch fire. We found no official U.S. source that reliably compares fire rates, so be wary of confident claims either way. What’s clear is that a damaged battery can release flammable gases and ignite later [1].
Can I use an extension cord to charge my EV?
Only if your owner’s manual allows it, and only the type it specifies. Otherwise, use a wall outlet or an installed Level 2 charger.
Can an electric car be towed with its wheels on the ground?
Often not. NHTSA warns that towing with the drive wheels on the ground can damage EVs and hybrids [1]. Follow your manual, and ask for a flatbed when unsure.
Why does my EV hum at low speeds?
That’s the pedestrian alert sound required by FMVSS 141 [4]. It helps people, especially those who are blind or have low vision, hear a slow moving car.
The bottom line
Recommendation from Safety Behind the Wheel Foundation
Charge by your owner’s manual on safe, properly installed equipment. Treat smoke, strange sounds, chemical smells or swelling as a signal to get everyone out and call 911. After any crash or flood, keep the vehicle outdoors, at least 50 feet from buildings, until a trained technician clears it.
Related articles
- Post crash care: what to do in the first minutes after a crash
- Vehicle maintenance for safety: tires, brakes, lights and warning signs
- Vehicle recalls and safety defects: how to check, fix and report
- Driving in rain: hydroplaning, standing water and flood safety
- Roadside breakdown safety: what to do when your car breaks down
Sources and further reading
- 1National Highway Traffic Safety Administration (NHTSA). Electric and Hybrid Vehicles (including FAQs on service, jump-starting, towing, charging in rain, floods, and damage or fire). No date shown; accessed October 3, 2026. nhtsa.gov/vehicle-safety/electric-and-hybrid-vehicles
- 2NHTSA. Battery Safety Initiative. No date shown; accessed October 3, 2026. nhtsa.gov/node/102846
- 3NHTSA. Vehicle Safety Research (summary of Comparative Analysis of Impedance and Gas Sensor Diagnostics for LFP/Graphite Cell Failures, DOT HS 813 817). Accessed October 3, 2026. nhtsa.gov/vehicle-safety-research
- 4NHTSA, Office of Vehicle Safety Compliance. Laboratory Test Procedure for FMVSS 141, Minimum Sound Requirements for Hybrid and Electric Vehicles. TP-141-01. October 16, 2020. nhtsa.gov/document/laboratory-test-procedure-fmvss-141…
- 5NHTSA, Office of Vehicle Safety Compliance. Laboratory Test Procedure for FMVSS 305, Electric Powered Vehicles: Electrolyte Spillage and Electrical Shock Protection. TP-305-02. May 24, 2022. nhtsa.gov/node/4161
- 6U.S. Department of Transportation (USDOT). Rural EV Toolkit: EV Charger Types and Speeds. Last updated January 31, 2025. transportation.gov/rural/ev/toolkit/ev-basics/charging-speeds
- 7USDOT. Rural EV Toolkit: EV Planning Resources: Implementation, Installation, and Maintenance. Last updated January 31, 2025. transportation.gov/rural/ev/toolkit/planning-resources/…
- 8NHTSA. Pedestrian Safety. No date shown (2024 data); accessed October 3, 2026. nhtsa.gov/road-safety/pedestrian-safety
- 9NHTSA. Countermeasures That Work: Pedestrian Safety, Understanding the Problem. No date shown; accessed October 3, 2026. nhtsa.gov/book/countermeasures-that-work/pedestrian-safety/understanding-problem
- 10Insurance Institute for Highway Safety (IIHS). Driver death rates remain high for small cars, models with powerful engines. July 30, 2026. iihs.org/news/detail/driver-death-rates-remain-high…
- 11NHTSA. Check for Recalls: Vehicle, Car Seat, Tire, Equipment. No date shown; accessed October 3, 2026. nhtsa.gov/recalls
- 12NHTSA. Report a Safety Problem. No date shown; accessed October 3, 2026. nhtsa.gov/report-a-safety-problem
This article reflects the safety priorities of electric vehicle safety engineering and EV emergency response. It is general education, not engineering, legal or professional advice for any individual vehicle. Your owner’s manual, automaker and qualified technicians come first. Laws, data and vehicle features change, so verify details with official sources. Reviewed October 2026.
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