The fastest options when your charger is missing or broken

If your laptop battery is dead and you do not have the original charger, you have four practical routes: borrow a compatible charger from someone else, buy a universal or replacement charger, use a USB-C power bank or cable if your laptop supports it, or charge through a USB port on another device. Which one works depends on your laptop model, how quickly you need power, and what you have available right now.

The method that works fastest is usually borrowing a charger that matches your laptop's connector type and power output. If that is not possible, a USB-C cable connected to a power bank or wall adapter is the next quickest option — though it charges more slowly than the original charger. Buying a replacement charger takes longer but is the most reliable long-term solution.

Key Takeaways

  • A borrowed charger must match your laptop's connector type and wattage rating, or it may not charge at all or could damage the battery.
  • USB-C charging works on many newer laptops but charges slower than the original charger and may not work while you are using the laptop heavily.
  • Power banks designed for laptops are portable but expensive, while universal chargers cost less and work with multiple laptop brands.
  • Charging through a USB port on a desktop computer or external device is extremely slow and should only be used as a last resort.

Borrowing a charger from someone else

This is the fastest option if you have access to another laptop owner. The charger must match two things: the connector shape and size, and the wattage output printed on the charger itself. A charger with the wrong connector will not fit. A charger with lower wattage will charge very slowly or not at all. A charger with much higher wattage can overheat the battery.

Before you borrow, check the label on your original charger or look up your laptop model online to find the connector type (common types are barrel connectors, USB-C, and proprietary connectors made by Dell, HP, or Lenovo) and the wattage, usually listed as "65W" or "90W". Then check the label on the charger you are borrowing. If both match, it is safe to use. If you are unsure, do not use it — a wrong charger can damage the battery or the laptop's charging circuit.

Buying a universal or replacement charger

A universal laptop charger has multiple connector tips that fit different laptop brands and models. These cost between $30 and $60 and work with most laptops made in the last ten years. They are slower than original chargers — usually 65W instead of 90W or 140W — but they are reliable and work across multiple devices if you own more than one laptop.

A replacement charger made for your specific laptop model costs $40 to $100 depending on the brand and wattage. Dell, HP, Lenovo, and Apple all sell replacements directly through their websites or through retailers like Amazon and Best Buy. A replacement charger charges at the original speed and is may provide to work with your laptop. If your laptop is older than five years, a replacement may be harder to find — in that case, a universal charger is your better option.

When you buy online, search for your exact laptop model number (usually on a sticker on the bottom of the device) plus the word "charger". This narrows the results to compatible options. Read the reviews to check whether other users report it working with your model.

Using USB-C to charge from a power bank or wall adapter

If your laptop has a USB-C port, you may be able to charge it with a USB-C cable and a power bank or wall adapter. Not all USB-C laptops support charging this way — check your laptop's manual or search online for your model number plus "USB-C charging" to confirm. If it does support it, you will need a USB-C power bank rated for at least 45W (60W or higher is better for faster charging).

USB-C charging is slower than the original charger. A 45W power bank will charge a typical laptop in four to six hours, while the original 90W charger takes two to three hours. If you are using the laptop while it charges, the battery may not gain power at all — it will only stop losing power. This method works best when you can leave the laptop plugged in and unused for several hours.

A USB-C power bank large enough to charge a laptop costs $60 to $150. If you already own a USB-C power bank, check its wattage rating on the label or in the manual. If it is 45W or higher and your laptop supports USB-C charging, you can use it right away with a USB-C cable.

Charging through a USB port on another device

Some laptops have a USB port that can receive power as well as send it. This is rare and usually only works on very new or very small laptops. If your laptop has this feature, you can connect a USB cable to a desktop computer, another laptop, or a power bank with a standard USB port. The charge rate is extremely slow — often taking 12 to 24 hours to fully charge a dead battery — because USB ports deliver much less power than a laptop charger.

This method should only be used as a last resort when no other option is available. It is useful for keeping the battery from draining completely while you wait for a charger to arrive, but it will not restore usable power quickly. Check your laptop's manual to see if this feature is supported on your model.

What to avoid when charging without the original charger

Do not use a phone charger, tablet charger, or any charger with a wattage lower than 45W. These deliver too little power and may not charge the laptop at all, or will charge so slowly that the battery drains faster than it fills while you are using the device. Do not use a charger with a much higher wattage than the original — a 180W charger on a laptop designed for 90W can overheat the battery and shorten its lifespan.

Do not force a connector that does not fit. If the charger tip does not slide smoothly into the port, stop and try a different charger. Forcing it can bend the connector or damage the charging port inside the laptop, which is expensive to repair. If the connector fits but the laptop does not recognize the charger (no light on the charger, no charging indicator on the laptop), unplug it when ready — this usually means the wattage is wrong or the charger is faulty.

Frequently Asked Questions

Can I charge my laptop with a phone charger?

Not reliably. Phone chargers deliver 5W to 30W, while laptops need 45W or more. Your laptop may not charge at all, or will charge so slowly that it loses power while you are using it. The only exception is if your laptop specifically supports low-power USB-C charging, which is rare. Check your manual to be sure.

How long does it take to charge a laptop with a power bank?

A 45W USB-C power bank takes four to six hours to fully charge a typical laptop battery. A 60W or 65W power bank takes two to four hours. Charging is much slower if you are using the laptop at the same time — the battery may not gain any charge while you are working.

Is it safe to use a higher wattage charger than the original?

A charger with slightly higher wattage (like 120W instead of 90W) is usually safe because the laptop's charging circuit regulates how much power it accepts. However, a charger with much higher wattage (like 180W or 240W) can overheat the battery and damage it over time. Stay within 50W of the original wattage when possible.

What if I cannot find a charger that matches my laptop's connector?

A universal charger with multiple connector tips will fit most laptops made in the last ten years. If your laptop is older or uses a rare proprietary connector, contact the laptop manufacturer directly — they can tell you which universal chargers are compatible or sell you a replacement charger.

Can I charge my laptop through the USB port while it is off?

Only if your laptop's manual states that it supports charging through USB while powered off. Most laptops do not. Even if they do, the charge rate is very slow. Turning the laptop off may speed up charging slightly, but it will still take many hours.