Hold on! Before You Buy That USB Charger, Read This

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Thanks to evolution, phone chargers these days are unlike what or how they used to be back in the day. Today we have USB chargers – USB C, Micro USB – they come with different ratings, design, and can deliver fast charging and multimedia support to various devices like mobile phones, tablet computers, laptops, game consoles, bluetooth speakers, bluetooth headsets, portable projectors, cameras etc.

A USB charger may seem easy to buy, but the fact is most people are clueless when it comes to selecting good chargers – they either go for brand names, or choose based on aesthetics – design, length, colour etc – or affordability. Not that any of those are wrong calls to make, but choosing a USB charger should be largely based on compatibility, charging capacity/rate and speed etc. This article should help you understand the basic things to know before buying a USB charger.

Power/Charging Rate

The charging capacity of a charger is usually measured in Wattage, Voltage and Ampere (amp) – and it determines or gives an estimate on the rate or speed at which a charger can juice up your phone. Usually, the higher the amperage of a charger, the faster your phone charges, and vice versa. Most USB chargers in the market have a rating of 1A and 5V output which gives a maximum of 5W and for 2A and 5V output, you get a maximum of 10W to charge your device.

However, while a 1A charger is good for a smartphone, it isn’t quite suitable for tabs. Charging tablets, iPads and devices of higher capacity with 1A charger may require a much longer period to charge. So for tablets, it is recommended to go for chargers with ratings at 2.4A – 5A. On the other hand, you can use a charger with a higher rating than your phone’s rating, as it (charger) automatically adjusts to provide the optimum amount of power your phone needs or even provides a quick charge.

Number of Charging Ports

Some USB charging stations are designed with multiple output ports usually ranging from 2 ports – 3 ports up to 7 ports – to enable simultaneous charging of several devices at the same time. Chargers like this do have high electrical power capable of providing maximum output that can be shared across all its ports to reach several devices at the same time. For example, if you’re charging 2 devices, power will be divided between and distributed to both devices. But imagine a 3.4 A on 1 phone, that means a much higher charging speed. 


You can choose about any USB charger for your phone, but as stated earlier, the higher the amperage of a charger, the faster it powers your device. What this means is that if you want a charger that provides a faster charging speed then you should be looking at those with 2.4A or 5A rating.

Many Android smartphones now incorporate fast charging technologies termed as Quick Charge 2.0/3.0, quick charging, fast charging, adaptive fast charging, turbo charging and many more. This feature often provides about 15W – 30W output allowing your phone to charge at the fastest rate possible – depending on the maximum wattage your device is able to handle.

There is also the Power Delivery fast charging feature that is compatible with only certain devices, particularly those that sport the USB C power delivery port. If your phone has this feature, then getting a power delivery USB charger would most likely be a good option.


This is another important factor to pay attention to when buying a USB charger. Most devices have specific maximum Wattage they can receive from any charger. So if your phone is designed to handle a maximum of 10W to charge, a 30W charger can do the job, but will only deliver nothing more than 10W to your phone. However if you use a charger less than 10W, the pace at which your phone charges will be slow.

To estimate the maximum output you can get from a charger in Wattage, simply multiply the voltage and the amperage. So before going for any charger, it is advisable to check for compatibility by examining the specifications imprinted on the body of the charger and comparing with your phone’s rating. 

As we have it, smartphones today are remarkable tech devices capable of incredible functionalities which, is mind blowing no doubt, but one of the downsides to their build is how fast the battery drains, especially when used extensively. For someone very dependent on, and constantly in use of their smartphone, the need for maximum battery power and life is of top priority.

So we hope this guide serves you well in making an informed decision when buying a USB charger for your devices. However, if there is the need for more knowledge, we recommend that you conduct extensive research on the Internet or consult with us.

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