Yes, you can usually leave a good USB car charger plugged in overnight, but an always-powered outlet may slowly drain your car battery. Unplugging it is the safest habit when you park.
Across the United States, many drivers use USB car chargers to keep their iPhones, Android phones, tablets, and other devices ready for the next commute. It is common to leave a small charging adapter in the 12-volt outlet after parking in a driveway, garage, or apartment parking lot. But is it ok to leave a car charger plugged in overnight? The answer depends on your vehicle, the charger, and whether the outlet stays powered after you turn off the engine.
A modern, well-made USB car charger usually uses very little power when nothing is connected. Still, some vehicles keep their accessory outlets active after the ignition is off. In that case, the charger can draw power from the starter battery. A connected phone can use more power, and a damaged or poorly made adapter can create an additional safety concern.
There is also a difference between a USB phone charger, a car battery charger, and an electric vehicle charging cable. These devices serve different purposes and have different safety rules. This guide explains the risks, shows how to check your vehicle’s outlet, and helps you decide when to unplug your charger.
Is It OK To Leave A Car Charger Plugged In Overnight?
Yes, in most cases, leaving a quality USB car charger plugged in overnight is not a problem. The key is whether your vehicle turns off power to the 12V outlet when you shut down the engine. If the outlet switches off, the adapter cannot keep drawing power from that circuit while the car is parked.
Some vehicles work differently. Their accessory sockets remain active even when the ignition is off. A charger connected to one of these outlets may continue to use a small amount of electricity. The amount depends on its design, standby circuit, indicator light, and overall condition.
This does not mean that every charger left overnight will cause a dead battery. A healthy car battery can normally handle ordinary standby loads. However, several days of parking, an older battery, cold weather, or other electrical accessories can change the result.
For everyday use, unplugging the adapter when you leave the vehicle is a sensible habit. It takes only a moment and removes one possible source of battery drain.
Source: detroitchinatown.org
Usually safe
A quality charger in a switched outlet that loses power after the ignition is turned off.
Needs attention
A charger in an always-powered outlet, especially when a phone or another device stays connected.
Not recommended
A damaged, loose, unusually hot, or unreliable charger that remains connected while the vehicle is unattended.
Why Does The Type Of Car Charger Matter?
The phrase car charger can describe several devices. A USB car charger fits into a 12V accessory socket and supplies power to a phone or tablet. A car battery charger connects to the vehicle’s battery to recharge it. An EV charging cable supplies power to an electric vehicle.
These devices should not be treated as interchangeable. A small USB adapter has a very different power demand from a battery charger or an electric vehicle charging system. The advice in this article mainly concerns USB phone chargers, with separate guidance for battery chargers and EV charging later.
USB car charger
A small adapter that provides USB power for phones and other portable devices.
Car battery charger
A device that connects to a car battery and supplies charging current to restore its charge.
EV charger
Charging equipment designed to supply electricity to an electric vehicle.
Can Leaving A Car Charger Plugged In Drain Your Battery?
Yes, it can drain your car battery if the accessory socket remains powered after the engine is off. A USB charger does not always stop using electricity just because you have removed your phone. Some adapters have small internal circuits that remain active while they wait for another device to connect.
This is known as standby power use. It is usually small for a well-designed adapter, but it continues as long as the outlet supplies electricity. An illuminated charger may also use power for its indicator light.
The bigger concern is often the condition of the vehicle battery. An older battery has less ability to hold a charge than a healthy new one. If the car already has an electrical problem or another accessory drawing power, even a small extra load may contribute to a starting problem.
For example, imagine leaving a vehicle parked for a long weekend. If its 12V outlet stays active, a connected phone, dash camera, and USB adapter may all use power. Their combined demand matters more than the USB adapter alone.
Source: thepowerfacts.com
Always-powered outlet
The outlet keeps supplying electricity after the engine is off, so connected accessories can continue drawing power.
Switched outlet
The outlet shuts off after the ignition is turned off or after a short delay.
Weak battery
An aging or poorly charged battery has less reserve for handling extra electrical loads.
Long parking period
A small electrical load can become more important when a vehicle sits unused for several days or weeks.
How Much Power Does An Idle USB Charger Use?
An idle USB car charger may use very little electricity, but there is no single standby figure that applies to every model. The design, internal electronics, indicator lights, and charger quality all affect power use.
You should also remember that a parked vehicle already uses some battery power. Its alarm, clock, keyless entry system, and other electronics may remain active. A charger adds to that existing load rather than acting as the only source of battery drain.
If you want to know the actual standby draw, a suitable automotive electrical meter can measure the current. This check should be done with the correct method because opening a battery circuit or using a meter incorrectly can cause problems.
Small standby load
A well-designed adapter may use very little power while waiting for a device.
Indicator light
An illuminated ring or LED may continue to use electricity while the outlet is active.
Connected phone
A phone that continues charging creates an additional electrical load.
Can One Night Kill A Healthy Car Battery?
A single night with a good USB adapter plugged into an otherwise healthy vehicle will not normally cause a dead battery. The risk is higher when the outlet stays active and the connected equipment uses substantial power.
A battery that is already weak may behave differently. If your engine struggles to start after one night, do not automatically blame the charger. Battery age, poor connections, an alternator problem, and another parasitic electrical load may be responsible.
If the vehicle repeatedly struggles to start after sitting overnight, arrange a battery and charging-system test. This can help identify whether the problem comes from the battery itself or an electrical drain.
Does Your Car’s 12V Outlet Stay On After You Turn Off The Engine?
This is one of the most important things to check before leaving a USB charger plugged in overnight. Some vehicles shut off their accessory sockets with the ignition, while others keep them active for a set period or allow them to remain powered.
For example, Ford owner guidance for certain vehicles warns drivers not to leave devices plugged into the power outlet overnight or during extended parking. Hyundai guidance for a specific vehicle also warns that prolonged use of its USB charging port while the vehicle is off can discharge the battery.
Volvo’s guidance for a particular XC40 model describes outlet behavior that depends on the vehicle’s operating mode and locking state. These examples show why you should not assume that every car uses the same electrical setup.
The exact behavior depends on the make, model, year, trim, and sometimes the selected vehicle settings. Always check the manual for your own vehicle.
Source: evcnice.com
Check the owner’s manual
Search for power outlet, accessory socket, 12V outlet, USB charging, or battery discharge.
Check the outlet after shutdown
Use a suitable USB power indicator or another safe low-power device to see whether the outlet still supplies power.
Lock the vehicle
Some vehicles change accessory power behavior after the doors are locked or after a delay.
Repeat the check
A delayed shutdown may make the outlet appear active immediately after parking even though it switches off later.
How To Check Whether Your Car Charger Outlet Is Always On
You can perform a simple check without taking apart the dashboard or touching the vehicle’s wiring. Start with the owner’s manual because it may already explain the outlet’s behavior.
If the manual does not provide a clear answer, use a low-power USB device or a suitable outlet tester. Do not use exposed wires, damaged adapters, or improvised electrical connections to test the socket.
Follow these steps:
1. Park the car in a safe place and turn off the engine.
2. Remove the key or switch off the ignition, depending on your vehicle.
3. Lock the doors if that is part of the normal shutdown process.
4. Wait for the vehicle’s accessory systems to shut down.
5. Check whether a suitable USB power indicator still shows that electricity is available.
6. Unplug the charger if the outlet remains active and you do not need it.
Signs of success
The outlet stops supplying power after the vehicle’s normal shutdown delay.
If power remains available
Treat the outlet as always-powered unless your owner’s manual explains another operating mode.
If the result is unclear
Ask a qualified automotive technician to check the outlet and its power-control circuit.
Is It Safe To Leave A Phone Charging In Your Car Overnight?
Leaving a phone connected to a car charger overnight is not the same as leaving an empty adapter in the outlet. The phone continues to receive electricity while it needs to charge, so the total electrical load can be higher.
Modern smartphones have built-in charging management systems. These systems control battery charging and help prevent ordinary overcharging when the phone reaches its charge limit. However, that does not make every charging setup safe in every condition.
Heat is a major concern. A parked car can become very hot in direct sunlight, even when the outside temperature seems comfortable. Excessive heat can affect lithium-ion battery health and may create a safety concern if a device or cable is already damaged.
For this reason, avoid leaving a phone charging unattended inside a hot vehicle. Do not place it under a seat, inside bedding, or against materials that prevent heat from escaping. Take the phone with you when you leave the car whenever practical.
Source: detroitchinatown.org
Avoid extreme heat
Do not leave a phone charging in a hot parked vehicle or in direct sunlight.
Use a suitable charger
Choose a reputable adapter that supports your phone’s charging requirements.
Check the cable
Replace frayed, exposed, bent, or otherwise damaged charging cables.
Allow airflow
Keep the phone and charger away from materials that trap heat.
Can Overnight Charging Damage Your Phone Battery?
Charging a modern phone overnight does not normally cause immediate overcharging damage. Most current smartphones manage their charging process automatically. Some models also offer optimized charging or a charge limit to reduce the time the battery spends at a high charge level.
However, battery aging still occurs. Repeated exposure to high temperatures and prolonged time at a full charge can contribute to battery wear over time. The phone’s charging controls cannot remove every effect of heat or poor charging conditions.
If your phone supports optimized charging, you can enable that feature. More importantly, avoid leaving the phone in a hot car and use a compatible charging adapter.
Normal charging control
Modern phones regulate incoming power as the battery approaches its charge limit.
Battery health
Heat and prolonged high-charge conditions can contribute to long-term battery wear.
Better routine
Use the phone’s battery protection settings and avoid charging in extreme temperatures.
Can A Car Charger Cause A Fire If Left Plugged In?
A properly made USB car charger in good condition is not normally expected to cause a fire simply because it remains plugged in overnight. However, electrical faults, poor connections, damaged cables, and low-quality charging accessories can increase the risk of overheating or electrical damage.
The main concern is not the number of hours alone. It is the condition and quality of the electrical equipment. A loose adapter may make poor contact with the socket, while a damaged cable can expose conductors or create an electrical fault.
Apple’s device safety guidance warns that damaged chargers and cables can cause fire, electric shock, injury, or property damage. It also advises keeping charging equipment in a well-ventilated area. These principles are useful when choosing and using car charging accessories as well.
If your adapter smells like burning plastic, makes unusual noises, shows melted areas, or becomes unusually hot, stop using it. Disconnect it only if you can do so safely. If it is smoking or actively burning, move away and follow local emergency procedures rather than touching the equipment.
Source: detroitchinatown.org
Damaged housing
Cracks, melted plastic, or loose parts may indicate internal damage.
Excessive heat
A charger that becomes unusually hot should be removed from service.
Poor electrical contact
A loose-fitting adapter may create an unreliable connection in the accessory socket.
Unreliable products
Poorly made adapters may lack suitable electrical protection and quality control.
Warning Signs That Mean You Should Unplug Your Charger
A quick inspection can help you identify a problem before it becomes more serious. Check the charger and cable from time to time, especially if you use them every day.
Do not try to repair a damaged USB adapter with tape or glue. These products contain electrical components that may not be safe to repair at home. Replace the entire adapter if its housing or electrical connection is damaged.
Burning smell
A sharp plastic or electrical smell may indicate overheating or an internal fault.
Melted plastic
Discoloration, soft plastic, or burn marks are reasons to stop using the adapter.
Unusual noise
Buzzing, crackling, or popping sounds may point to an electrical problem.
Loose fit
An adapter that repeatedly disconnects or moves in the socket may have a poor connection.
Damaged cable
Exposed wires, broken connectors, and frayed insulation should not be ignored.
How To Choose A Safer USB Car Charger
Choose a charger from a reputable manufacturer and check that its electrical ratings match your vehicle and connected devices. Look for clear product information, proper overcurrent and overtemperature protection, and relevant safety testing for the market where you use it.
In the United States, a recognized independent safety certification can provide useful information about electrical product testing. Do not assume that a printed certification logo is genuine without checking the manufacturer and product details.
Avoid extremely cheap adapters with unclear specifications. A small saving is not worth using an accessory that may damage your device or vehicle.
Good construction
Look for a sturdy case, secure USB ports, and a plug that fits properly.
Clear ratings
Check the supported input voltage and USB output ratings.
Safety protection
Look for documented protection against excessive current, voltage, and temperature.
Trusted seller
Buy from a reputable seller and avoid products with unclear origins.
Should You Unplug Your Car Charger Every Night?
Unplugging your car charger every night is a good habit, especially if you are unsure whether the accessory outlet stays powered. It removes the adapter’s standby load and prevents an unused accessory from remaining connected while your vehicle is parked.
You do not need to panic if you have left a good charger plugged in for one night. Instead, check your vehicle’s power outlet behavior and inspect the adapter. If the socket switches off automatically, the risk of overnight battery drain from an empty adapter is much lower.
For drivers who park their vehicles for several days, unplugging is more useful. It reduces the number of connected accessories and makes it easier to identify the source of an unexpected battery drain.
This small habit is also helpful if several people use the same vehicle. Someone may connect another device without realizing that the outlet remains active after the engine is turned off.
Source: thepowerfacts.com
Daily parking
Unplugging is optional for a sound charger in a switched outlet, but it remains a simple precaution.
Long-term parking
Remove unused chargers and other accessories that may draw power.
Older vehicle battery
Avoid unnecessary electrical loads if the battery already has trouble holding a charge.
Uncertain outlet behavior
Unplug the adapter until you confirm whether the socket shuts off automatically.
What If You Accidentally Leave The Charger Plugged In?
If you forget to unplug your USB car charger one night, there is usually no reason to worry. A healthy vehicle with a switched outlet should not have a battery problem because of an unused adapter.
If your car does not start the next morning, check the battery condition rather than assuming the charger caused the problem. Turn off unnecessary electrical equipment and look for other possible causes.
If the engine starts normally, you can continue using the vehicle. Still, check the outlet’s shutdown behavior and unplug accessories when they are not needed.
Car starts normally
There is usually no immediate action needed, but check your outlet and charger.
Slow engine cranking
Have the battery tested if the problem continues.
No electrical power
Check the battery and relevant fuses. Seek roadside assistance if needed.
Repeated battery problems
Ask an automotive technician to perform a parasitic-draw test.
Is It Safe To Leave A Car Battery Charger Connected Overnight?
A car battery charger is different from a small USB phone adapter. It connects to the vehicle’s battery and supplies charging current. Whether you can leave it connected overnight depends on the charger design, battery type, and manufacturer’s instructions.
Many modern automatic battery chargers include charging controls that adjust the current as the battery charges. Some also have a maintenance mode that can keep a compatible battery charged during long periods of storage.
However, not every battery charger is designed for continuous connection. A basic manual charger may require the user to monitor charging and disconnect the unit at the correct time. Leaving the wrong type connected for too long may overcharge or damage the battery.
Before using one overnight, read the instructions for both the charger and the battery. Check that the device supports your battery chemistry, voltage, and capacity. Follow the specified ventilation, connection, and charging procedures.
Source: engineauditor.com
Automatic smart charger
May be suitable for overnight charging when the manufacturer specifically permits it.
Battery maintainer
Designed to help maintain a compatible battery during storage when used according to its instructions.
Manual battery charger
May need monitoring and manual disconnection rather than continuous overnight use.
Damaged battery or charger
Do not attempt unattended charging until the equipment has been inspected and the problem addressed.
Can You Leave A Smart Battery Maintainer Connected For Days?
Some smart battery maintainers are designed for long-term use with compatible batteries. They monitor the battery and adjust their operation to help maintain its charge.
This can be useful for a vehicle that stays in a garage for weeks. However, the device must be designed for continuous maintenance, and the battery must be compatible with its charging program.
Keep the unit in a suitable, dry, ventilated location. Protect the cables from damage and follow the correct connection order. If the manufacturer does not clearly permit continuous connection, do not assume that it is safe.
Confirm compatibility
Check the battery type, voltage, and capacity against the maintainer’s specifications.
Follow connection instructions
Use the recommended clamps or approved connection leads.
Keep it ventilated
Avoid enclosed areas that trap heat or expose electrical equipment to moisture.
Inspect regularly
Look for loose connections, damaged wires, unusual heat, or warning lights.
Can You Leave An Electric Car Charging Overnight?
Electric vehicle charging is another separate situation. Many EVs are designed to charge while parked overnight, and their charging systems include controls for managing the charging process.
However, you should use compatible charging equipment and follow the vehicle and charger instructions. Check the charging cable, connector, outlet, and charging station for visible damage before use.
Do not use damaged extension cords or unsuitable electrical outlets. For home charging in the United States, use properly installed equipment that meets the vehicle and local electrical requirements.
A normal overnight charging session is not the same as leaving a small USB car adapter in a 12V socket. Each system has its own electrical limits and safety instructions.
Use compatible equipment
Choose an EV charging system approved for your vehicle and electrical setup.
Inspect the cable
Do not use damaged connectors, exposed wires, or cracked charging equipment.
Follow charging limits
Use the vehicle’s charging settings and the equipment manufacturer’s instructions.
Avoid unsuitable outlets
Have a qualified electrician assess a home charging installation when needed.
Common Mistakes To Avoid When Leaving A Car Charger Plugged In
Most problems with overnight charging come from assuming that every car and charger works in the same way. A simple USB adapter may be harmless in one vehicle but contribute to battery drain in another.
Avoid these common mistakes to reduce the chance of electrical problems. A quick inspection and a little attention to your vehicle’s manual can prevent many unnecessary issues.
Source: detroitchinatown.org
Assuming every outlet switches off
Some 12V outlets remain active after shutdown. Check the behavior of your exact vehicle.
Leaving a phone in a hot car
High temperatures can harm a phone’s battery and create additional safety concerns.
Using damaged adapters
Cracked housings, loose plugs, and damaged cables should be replaced.
Buying the cheapest charger available
Products with unclear ratings and poor quality control may lack suitable safety protection.
Ignoring an old car battery
A weak battery can fail even when the charger itself uses very little standby power.
Confusing different charging devices
A USB adapter, battery charger, and EV charging system have different power requirements and operating rules.
Ignoring repeated starting trouble
Repeated battery problems need proper testing rather than repeated guesses about the charger.
When Should You Ask A Mechanic For Help?
If your car battery keeps losing power overnight, a mechanic or automotive electrical technician can test the battery and charging system. They can also measure parasitic current draw to identify equipment that remains active after the vehicle shuts down.
Seek professional help if you notice burning smells, melted outlet parts, repeated blown fuses, or signs of damaged vehicle wiring. Do not remove dashboard panels or modify electrical circuits unless you have the proper training.
If a battery is swollen, leaking, or producing an unusual smell, avoid handling it and arrange professional inspection. Damaged batteries can present chemical and electrical hazards.
Repeated dead battery
A proper battery and parasitic-draw test can help find the cause.
Burned accessory socket
Have the outlet and its wiring inspected before using it again.
Repeated fuse failure
A technician should identify the electrical fault rather than fitting larger fuses.
Visible battery damage
Avoid contact and arrange professional battery service.
USB Car Charger vs. Battery Charger: Which Can Stay Connected Overnight?
The safest choice depends on the kind of charger you are using. A USB car charger is usually a low-power accessory, while a battery charger supplies energy directly to the starter battery. An EV charger is designed for a much larger charging load.
The table below compares their main uses and the conditions that affect overnight safety. It is a general guide, not a replacement for the instructions supplied with your vehicle or charging equipment.
Source: evcnice.com
A Practical Comparison Of Different Car Chargers
Use this comparison to identify the right precautions for your equipment.
USB phone charger
Usually safe in good condition, but unplug it if the outlet stays powered and you do not need it.
USB charger with a phone connected
Can draw more power and may contribute to battery drain if the outlet stays active.
Automatic battery charger
Can be used overnight only when its instructions allow unattended charging.
Smart battery maintainer
May remain connected for extended periods when the manufacturer approves continuous maintenance.
Electric vehicle charger
Can support overnight charging when the equipment, installation, and vehicle instructions permit it.
A Simple Overnight Car Charger Safety Checklist
Before leaving your vehicle for the night, take a few seconds to check the charging equipment. This is especially useful if you park outside, use an older vehicle, or have an outlet that stays active after the engine is turned off.
You do not need special tools for a basic visual check. The main goal is to remove unnecessary accessories and identify visible damage before leaving the car unattended.
Source: detroitchinatown.org
Check the adapter
Make sure its case is intact and the plug fits securely into the socket.
Check the cable
Look for fraying, exposed wires, bent connectors, and other visible damage.
Check the outlet
Confirm whether it shuts off automatically when the vehicle is parked.
Remove unused devices
Disconnect phones and other accessories when you no longer need them.
Watch for heat
Do not leave an adapter connected if it becomes unusually warm or shows signs of damage.
Check the battery
If your car has a history of weak starts, have the battery tested.
Follow the manual
Use the vehicle manufacturer’s instructions for the accessory outlet and electrical system.
What To Do If Your Car Battery Is Dead The Next Morning
If your vehicle does not start, first make sure the car is in a safe location. Turn off lights and other electrical accessories, then check the battery and dashboard for warning signs.
If you suspect a flat battery, use roadside assistance or a suitable jump-start method that follows your vehicle’s manual. Modern vehicles may have specific jump-start points and procedures, so do not connect cables randomly.
Once the engine starts, arrange a battery and charging-system test if the problem is new or happens repeatedly. Simply driving for a short time may not fully recharge a deeply discharged battery.
If the charger remains connected to an always-powered outlet, unplug it after the vehicle is safely shut down. This removes one possible source of additional drain while you investigate.
Do not force the ignition
Repeated starting attempts may not solve a low-battery problem.
Follow the jump-start instructions
Use the correct connection points and sequence for your vehicle.
Test the electrical system
Check battery health, alternator output, and parasitic current draw when needed.
Frequently Asked Questions
Q
Can I Leave A USB Car Charger Plugged In All Night?
Yes, you usually can leave a good USB car charger plugged in overnight. However, the outlet must be considered. If it stays powered after the ignition is off, the adapter may continue drawing electricity from the vehicle battery.
Unplugging the adapter is a simple precaution, especially if you do not know how your vehicle’s accessory socket works.
Q
Will A Car Charger Drain My Battery If Nothing Is Connected?
It can, because some USB car chargers continue using a small amount of standby power even when no phone is connected. The amount depends on the adapter and whether the outlet remains active.
A good adapter may have a very small standby load, but unplugging it removes that extra electrical demand.
Q
Should I Unplug My Car Charger When The Engine Is Off?
Unplugging it is a sensible habit if the outlet remains powered after shutdown. It is also helpful when leaving the vehicle parked for several days.
If your outlet automatically switches off, leaving a good adapter connected is generally less concerning. Still, follow the instructions in your owner’s manual.
Q
Can Leaving A Phone Charging In A Car Overnight Cause A Fire?
Normal charging with compatible equipment does not automatically cause a fire. However, damaged cables, faulty adapters, poor electrical connections, and excessive heat can create safety risks.
Avoid leaving a phone charging in a hot vehicle. Stop using any charger that smells burnt, becomes unusually hot, or shows visible damage.
Q
Does A Car Charger Use Electricity When The Car Is Off?
Yes, it may use electricity if the accessory socket stays active. Some adapters have standby circuits or indicator lights that continue to operate without a connected phone.
If the vehicle shuts off power to the outlet, the adapter will not continue drawing power from that circuit.
Q
Can I Leave A Fast Car Charger Plugged In Overnight?
A reputable fast USB car charger can usually remain in a switched-off accessory outlet without a problem. Its maximum charging speed does not mean it constantly draws that full amount of power.
However, a fast charger in an always-powered outlet may still use standby electricity. Check its condition and unplug it when not needed.
Q
Can I Leave A Car Battery Charger On Overnight?
You can leave some automatic battery chargers connected overnight if their manufacturers specifically permit unattended charging. A smart charger may adjust its output as the battery approaches full charge.
Do not assume that a basic manual charger is suitable for overnight use. Read its instructions and check that it supports your vehicle’s battery type.
Q
Does Leaving A Charger Plugged In Affect An Electric Car?
An electric vehicle charging system is different from a small USB car adapter. Many EVs support overnight charging through compatible charging equipment and built-in charging controls.
Use the recommended equipment, follow the vehicle’s charging instructions, and inspect the cable and connector before use.
✦ Wrapping Up
Conclusion
So, is it ok to leave a car charger plugged in overnight? Yes, a good USB car charger is generally safe when used with a suitable vehicle outlet. The main concern is whether that outlet continues supplying power after the engine is turned off. If it does, the adapter or a connected phone may slowly drain the starter battery.
You should also pay attention to charger quality, cable condition, and heat. Avoid damaged accessories and do not leave a phone charging inside a hot parked car. If your battery repeatedly loses power, arrange a proper electrical system check rather than assuming the charger is the only cause.
The same rules do not apply to every charging device. Smart battery maintainers and EV charging equipment have their own instructions, and you should follow them carefully.
💡 Key Takeaway
Before leaving your car tonight, unplug unused USB chargers and phones, check whether your 12V outlet stays powered after shutdown, and replace any damaged charging accessory. When in doubt, follow your vehicle owner’s manual.
