J-Go Tech Support Team - October 8, 2020
Why am I not able to use a USB-A port to charge my laptop?
T he short answer: The voltage and power that standard USB (called USB-A) ports support are not powerful enough for laptops.
To elaborate on this topic, there are a few key things to keep in mind:
- 1. Voltage and Power
- 2. Power Output and Limitations of USB-A Ports
- 3. Power Required By Laptops
- The Wrap-up
1. Voltage and Power
Most of our devices are designed to recharge using a specific voltage to prevent damage to the device. The easiest way to figure out the voltage used by your device is by simply referring to the information printed on the original charger that was included with your purchase. You will want to look for the power output of the charger, which is typically in the format, “__V/__A”.
A simple comparison would be automobiles and the type of fuel they require to operate. If you have a sedan that requires regular unleaded gasoline, filling the tank with diesel fuel wouldn’t be compatible. Our devices and the voltages they require to recharge are very similar to this. If you own a device that requires a 15V current to recharge, a 5V or 20V current would not be compatible.
With this being said, we also have to pay attention to the amount of power required by our devices. While some chargers may list the power output in watts (W), other chargers may not. The good news is that it’s very simple to figure this out.
Once you have located the power output, simply multiply the voltage (V) by the amperage (A) to determine the watts (W).
Example: 5V/2A (5 x 2) = 10W ; 20V/2.25A (20 x 2.25) = 45W
Example: 5V/2A is the same as (5 x 2) = 10W ; 20V/2.25A is the same as (20 x 2.25) = 45W
2. Power Output and Limitations of USB-A Ports
USB-A is the most common type of USB port. These ports can be found on most standard chargers that are included when you purchase small portable devices, such as a phone or tablet. However, all USB-A ports are not created equally. A large majority of USB-A ports only support a 5V current, which is fine for charging small devices, but not quite powerful enough for large devices. Depending upon the device, the included charger may support up to 12W (5V/2.4A). If you have a new USB charger, you may notice that the inside of one or more of the USB-A ports have a color, which typically indicates that it supports a “fast charging” technology. Sometimes, these USB-A ports can support 5V, 9V and 12V currents, up to a total of 18W, which allows compatible devices to charge more rapidly.
It is also worthy to note that it is extremely rare for a USB-A port to support amperages exceeding 3A or 18W, whichever is the greater. Due to this, even the most powerful USB-A chargers will only support 5V/3A (15W), 9V/2A (18W) and 12V/1.5A (18W). Some USB-A cables may also limit the amperage due to the internal wires or the type of connector on the opposite end of the cable, so be sure to use a compatible cable for your device and charger.
3. Power Required By Laptops
The voltage and power required to recharge a laptop will vary drastically amongst various computers. Sometimes, this will even vary amongst the same laptop models due to having a more powerful processor or graphics card, so it’s always best to look at your original charger that was included with the device. A large majority of laptops recharge using currents between 15V and 20V, and require power upwards of 36W.
As you can see, the voltage and power required to recharge a laptop are drastically higher than what a USB-A port can provide, which causes this compatibility issue for charging. While there may be a few small laptops that can recharge at lower voltages and/or currents, these computers are not very common and would still recharge at a much slower speed.
We hope that this is helpful as you look for portable charging solutions for your laptop. If you have any questions or need some assistance, feel free to reach out to our team of experts!
At J-Go Tech, we focus on developing innovation charging solutions that primarily support USB-C charging. As USB-C charging becomes a standard way of charging, we understand that there will be many opportunities for people to charge their devices faster, easier and with less equipment. With this, we are on a mission to educate consumers on the advantages on USB-C charging technology.
Have questions or need a personalized solution? Want us to cover another topic or model?
Reach out and let us know at email@example.com!
Have a question for us to cover in our next post?
Don't Miss The Next Post!
PLUS: Get Inside Information and Exclusive Offers.
i have had this powerbank for about a month now, it has been sensational. I initially got this powerbank for a hp spectre x360
laptop I was hoping to get, but haven't done that yet. now i mainly use it to charge my google pixel 5 phone.
it hasn't given me any issues.
I am glad i purchased this powerbank
All-in-one charger is perfect
My wife and I enjoyed the initial Tanker that I ordered in 2018 for my Nintendo Switch. With our daughters using tablets and my wife’s iPad daily, we ordered two more Tankers to make sure that their devices didn’t have any downtime. They work great and I highly recommend them.
I bought this along with the MICROSOFT SURFACE CONNECT TO USB C CHARGING ADAPTER | 15V, to use as a backup power supply for my Surface Pro 7. They both work great.
Simply i contact the support client and they say they will send the cable i hope i will recive but i'm realy not sure the first cable they send to me there was not tracking and i did not recive my article and 20 days later i contact suppirt very quick they respond me they sayd they gonna send annother quick well i still waiting for it if i recive the cable one day i will change my note
Holds a charge like no other. Very pleased with customer service.
I am very impressed by the prompt service
The Tanker 45W PD | 26800mAh USB C PD Power Bank
usually battery bank capable of charging laptops come with 20k mAh capacity and up which i find a bit too big and heavy. So this unit was perfect for me. will easily keep you juiced up all day at cafe's etc without needing to find a power point
Love this product. Makes everything so much easier and I can take it overseas with no issue!
Highly recommend the product and company. They stand behind their excellent products.
Surface Connect to USB-C Charging Cable
I've bought multiple power banks from different brands, but I've only been 100% satisfied with the one from J-Go Tech. It comes with a soft sleeve to keep it from getting scuffed and the cables feel well built. It charges every device I intended it for, which are a oneplus 7t, a surface pro 4, and a galaxy tab 8 without any issues. I wholeheartedly recommend the Tanker Power Bank.
comes in handly as at work i only carry this and nt a full charger