can you charge laptop safely using usb in car

[OColin]

Yes, you can charge a laptop safely in a car using USB, but only if your car's USB port and your laptop both support the USB-C Power Delivery (PD) standard. Standard USB-A ports found in most cars provide only 5-15 watts of power, which is insufficient for a laptop and may only slow its battery drain. For safe and effective charging, you need a USB-C PD port that can deliver at least 30-45 watts or more.

The key factor is power output, measured in watts (W). A laptop typically requires significantly more power than a smartphone. Using an underpowered port isn't necessarily dangerous, but it can lead to frustratingly slow charging or cause the laptop to discharge while in use.

Charging Method	Typical Power Output	Can It Charge a Laptop?	Key Considerations
Car USB-A Port	5W - 15W	No	May slow battery drain; insufficient for charging.
USB-C Port (without PD)	7.5W - 15W	Unlikely	Check your laptop's minimum wattage requirements.
USB-C Power Delivery (PD) Port	30W - 100W+	Yes	The safest and most effective method. Look for PD labeling.
12V DC Cigarette Lighter Port	60W - 100W+	Yes	Use with a dedicated high-wattage laptop car charger. Most reliable option.

For the safest setup, using the car's 12V outlet (cigarette lighter) with a manufacturer-approved car charger adapter is often the most reliable. It bypasses the car's infotainment system and delivers consistent, high power. Always check your laptop's power requirements (usually listed on the original AC adapter, e.g., "65W") and ensure your car's USB-C PD port or 12V adapter meets or exceeds that rating to avoid potential issues.

[McBennett]

It's possible, but don't count on it for a real charge. Most car USB ports are meant for phones. You'll probably see a "slow charger" notification or your battery might still drop if you're using the laptop. It's like trying to fill a swimming pool with a garden hose. For a sure thing, get a charger that plugs into your car's 12V outlet (the old cigarette lighter). It's way more powerful and designed for the job.

[LeAaliyah]

As someone who works remotely from my car often, the answer hinges on USB-C Power Delivery. If your car has a USB-C port marked with a 'PD' symbol or your owner's manual says it supports high-wattage output, you're in luck. My car's 45W USB-C PD port charges my ultrabook almost as fast as a wall outlet. If it's just a standard USB port, forget it. It's not a safety risk, just a waste of time. Investing in a quality 12V adapter is a more universal solution.