How Much Power Does A Power Bank Need To Charge A Laptop?

Power banks are an increasingly popular type of portable power supply that can be used to charge small electronics on the go, such as smartphones and tablets, as well as larger devices like laptops and digital cameras. But do you really need a power bank that can provide you with enough juice to fully recharge your laptop? 

How Many Amps Does A Power Bank Need To Provide To Charge A Laptop?

Most laptops are USB-C compatible and can be charged using a power bank that has a USB-C port. However, some laptops might not be USB-C compatible and require a different type of cable in order to charge. In this case, it’s important to check the manual for your laptop or consult the manufacturer for specific information about how many amps your laptop requires to charge fully. 

If you’re unsure about the ports on your power bank, there is usually an indicator label on the device with an output current number (in amps) on it. Most devices have an output current in the range of 3A to 5A. If your laptop has multiple connectors, then a charger with 4A should be sufficient to recharge its battery while you use it. 

Generally speaking, the higher the amp rating of your charger the faster it will charge. The average power bank will provide up to 10W which would translate into approximately 1A per hour. A lower amp rating like 2A translates into 0.5 hours per hour but would take twice as long as a charger rated at 4A if used continuously at maximum charging speed; however, a lower rated charger might be more suitable if used intermittently when only needed once every other day or so as most people don’t need their devices constantly plugged in these days unless they have solar panels or other external sources of electricity available.

How Long Does It Take A Laptop To Charge With A Power Bank?

A power bank is an excellent way to charge a laptop. The capacity of the power bank will dictate how long it takes to charge your laptop. 

For example, if you have a 10,000mAh model, then it should take about 2 hours to fully charge your laptop. Most power banks have a port for USB-A and one for USB-C. This means that you can use the USB-A port to plug in your laptop charger and the USB-C port to plug in your power bank’s charging cable. You may want to invest in a few extra cables so that you can also keep your phone charged up during emergencies. 

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How Many Amps Does USB 3.0 Provide?

USB 3.0 provides a maximum amperage of 900 mA, which is more than enough for a laptop. 

For Apple laptops with Magsafe 2 connectors, the max power will be 12 Watts (around 900 mA). 

If you want to charge your laptop through an AC adapter, the max amperage is 17 Watts (or 1200 mA). 

This means that even though USB 3.0 is capable of providing 900mA and an AC adapter can provide up to 1200mA, an AC adapter will take much longer to charge your laptop because it’s only capable of providing one-third the amount of power as USB 3.0 at any given time and requires time to switch between charging modes. 

With this in mind, you’ll need at least two separate AC adapters to make sure your laptop is fully charged in the shortest amount of time possible.

How Many Watts Does A Laptop Use?

The average laptop uses between 60-90 watts of power while being used. The wattage will vary depending on the task being performed, but in general the higher the demand for processor speed or graphics rendering, the more watts will be consumed. When you’re not using your laptop, it goes into sleep mode or hibernation and consumes less than 1 watt of power. So how much power does your laptop need to charge from a power bank? 

It depends on how much charge is left in your battery and how long you want to use your laptop before recharging it again. If you have 10% battery life left and want to use your laptop for 2 hours, then you would need about 15 watts. If you have 75% battery life remaining and are looking at 4 hours of usage time, then a 6 watt power bank should do the trick.

The best thing to do when considering charging your laptop from a power bank is to calculate how many watts you need per hour. Then make sure the output (the amount of volts multiplied by the number of amps) matches this number. Also keep in mind that different laptops may require different levels of voltage, so be sure to check which voltage requirements your laptop has if this isn’t specified by the manufacturer first. 

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How Many Watts Does USB 3.0 Provide?

USB 3.0 provides up to 5Gbps or 625MBps of bandwidth, which is around 12 times as much as USB 2.0. The increased power allows for faster data transfer and charging, which translates to quicker file transfers and battery recharges on devices.

In order to charge a laptop with a power bank, it needs to be at least 18W or greater with at least 2 amps output on the USB port. This will typically charge the laptop in about 4 hours when the battery is completely drained . Some higher end laptops may require more than this and take 6-8 hours to recharge fully. If you find that your laptop does not seem to be charging quickly enough, check your manufacturer’s website for an online tool that can help you figure out how much power your laptop requires. 

In general, we recommend using a charger that has at least 20 watts and outputs 1 amp per port so that you can get full use of the device while it’s plugged into the charger without having to wait forever.

How Many Watts Does A Laptop Need In Total?

The amount of watts your laptop requires will vary depending on the size of your laptop. If you have a small laptop, it may only need 15 watts, while a larger one might need 25 or more. The total wattage required to charge your laptop depends on how long you want it to last and how often you use it. If you want to know the exact number, check with the manufacturer. They’ll be able to tell you exactly how much power is needed for your specific model. 

One thing that isn’t always taken into account when thinking about wattage is the charger itself, which can require 10-20 watts at all times. Once you factor in the charger, this means that your battery bank needs a minimum of 35-45 watts to charge your laptop safely. And if you’re using an outlet for the charger, that’s another 20-25 watts. 

It’s important to note that many battery banks won’t have enough capacity to fully charge your laptop in one go. That means that you’ll likely need two or three power banks over time if you’re using a smaller device like an iPad Mini, but four or five if it’s something like an 11 MacBook Air. 

The good news is that laptops usually don’t draw as much power as they could from their chargers while they’re charging, so these numbers are just estimates – as long as your laptop has some kind of auto shutoff feature (or warning light) when its batteries are full, there’s no risk of blowing up anything by overcharging.

Read: How Long Will A Power Bank Run A Laptop?


It would take a pro-pd power bank with a capacity of at least 7000 mAh to charge an average laptop. If you have any questions or concerns about your power bank’s charging capabilities, please check the manufacturer’s manual for more information. 

Donald Felix

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