The Number One Power Bank in Six Categories

At Couponbox, we love to research useful electronics, one of which is the power bank.

Because of this, we have created a useful ranking of the best power banks on the internet in six categories which you can jump to here:

Considering that most Americans have grown quite dependent on cell phones, buying a power bank makes good sense.

Mostly because we don’t use them only for phone calls, but for text messages, entertainment, personal organization, business organization, research and much more.

In a single day, we might use up an entire battery’s capacity or more.

Maybe it’s not always a problem, but if you get lost in Appalachia or Death Valley, you might wish you had a power bank!

Therefore, Couponbox has researched the top tech review websites (see resources below) to help you choose the perfect power bank for you.

We analyzed more than 100 of the top ranking power banks on the internet and categorized them six ways to Sunday (which means thoroughly, in old-timey speak).

But before we get to the rankings, here are some important things to consider:

Why Buy a Power Bank?

Power banks are generally used to charge cell phones, which is the focus of this article.

However, some power banks can charge tablets and even laptops.

But why should you buy one? Before buying, you should consider your reason for it.

The most common reasons are:

  • Phone Calls – making phone calls drains your battery fast
  • Travel – being away from a power source for long periods of time makes a power bank essential for travel
  • Video – both watching video and recording video are a huge drain on your phone or tablet’s battery
  • Games – mobile games are fun, but consume a lot of power

Whatever your reason for buying a power bank are, you should also consider the following:

What to Look for in a Power Bank

There are many features of a power bank to consider before choosing one.

These are the six most common features:

  • Number of charges – they usually have at least one charge and up to 10 or more
  • Number of USB ports – more USB ports means charge multiple devices simultaneously
  • Weight – the lower the weight of a power bank the more convenient it is to carry around
  • Size – as with weight, the smaller the size, the better

How to Use a Power Bank

Using a power bank might seem like a no-brainer to most of you, however, it’s worth running through the basics.

A power bank is essentially an external battery for your USB enabled device, such as a tablet, cell phone or even a laptop computer. However, the power banks that we are talking about today are for tablets and cell phones. So the process is very straightforward.

First you need to charge the power bank itself. Do this by plugging the power bank to a power outlet using a USB power adapter (fitted with a micro-USB plug). For most power banks, especially the higher-capacity models, it takes a few hours to completely charge the power bank.

Once you charge it fully, you can take it out with you on your travels or around your home town to use when your cell phone or tablet’s battery starts to get low.

Without further ado, we present to you the best power banks in six different categories…

Category #1: Best Convenience in a Power Bank

To determine the winner of this category, we invented what we call the Couponbox Convenience rating.

To calculate the Convenience rating, we took the average number of charges (iPhone 7 and Samsung Galaxy S8) of each power bank and divided that number by its weight.

So if it weighs 10 ounces and can hold 10 charges, it has a Convenience rating of 1. A rating of 1 means that it holds one charge per ounce, which is extremely convenient.

And the winner is…

The ExpertPower 20,000 mAh Portable Charger with a Convenience rating of 72.

ExpertPower 20,000 mAh Power Bank

ExpertPower 20,000 mAh Portable Charger

ExpertPower 20,000 mAh specs:

  • 20,000 mAh capacity
  • 2 USB ports
  • Built-in flashlight
  • Slim design

This is perfect for people who travel and want to get the most out of their luggage.

Category #2: Best Power Bank by Cost per Charge

The power bank with the lowest cost per charge was determined by dividing the power bank cost by the number of times it can charge an average cell phone battery. We calculated the average cell phone battery capacity using the capacities of the iPhone 7 and the Samsung Galaxy S8.

And the winner of the best power bank by cost per charge is…

Again! We have a repeat winner: The ExpertPower 20,000 mAh Portable Charger with an average cost per charge of $2.23.

This power bank is perfect for readers who want to save money but don’t want to sacrifice power.

Category #3: Best Power Bank by Cost

The most affordable cell phone was easy to decide. It’s the lowest cost for a powerbank regardless of how many charges.

And the winner of the best power bank by cost is…

The Allpowers 3,400 mAh External Battery Charger is an extremely affordable power bank that costs only $7.50.

Allpowers 3,400 mAh Power Bank

Allpowers 3,400 mAh External Battery Charger

Allpowers 3,400 mAh specs:

  • 3,400 mAh capacity
  • Slim design

This choice is perfect for shoppers who want a minimum amount of power for the lowest cost.

Category #4: Best Power Bank by Cost for Convenience

The lowest cost for convenience goes to another repeat winner. We calculated the cost for convenience as the power bank cost divided by the Couponbox Convenience rating.

And the winner by cost for convenience is…

The Allpowers 3,400 mAh External Battery Charger with a cost for convenience of $0.15.

This choice is ideal for travelers who want the most convenience for their dollar.

Category #5: Best Power Bank by Weight

The next two best cell phones are no-brainers. In this category, the winner is the cell phone with the lightest weight.

And the winner is…

The Travelcard weighing in at 1.9 ounces with 1,500 mAh.

The Travelcard Power Bank

The Travelcard

Travelcard specs:

  • Ultra-slim design
  • Low weight
  • 1,500 mAh capacity

Perfect for people who need a minimum amount of power at the lightest weight.

Category #6: Best Power Bank by Number of Charges

The best model by number of charges was chosen simply by selecting the one with the highest number of charges.

It seems like we have a tie between…

The Allpowers 30,000 mAh Mini Portable Charger

Allpowers 30,000 mAh Power Bank

Allpowers 30,000 mAh Mini Portable Charger

Allpowers 30,000 mAh specs:

  • 30,000 mAh capacity
  • Full recharge in 7 hours
  • 3 USB ports equipped
  • High-speed charging with output at 2.4A and 4A
  • Surge and short circuit protection


The ZeroLemon ToughJuice 30,000 mAh

ZeroLemon ToughJuice Power Bank

ZeroLemon ToughJuice 30,000 mAh

ZeroLemon ToughJuice 30,000 mAh Specs:

  • 30,000 mAh capacity
  • 5 USB ports
  • USB-C Compatibile
  • Durable shell

This is the best choice for those who want the most power for a low price.

Power Bank Resources

To create the above rankings, we consulted the following pages, which are the top ranked pages on Google for power bank recommendations.

Compare these sites to our rankings and come to your own conclusions:

The 9 Best Battery Packs to Keep Your Gadgets Going

Best Power Banks Guides & Reviews In 2017

The Best Portable Battery Chargers

The best power banks for 2017

Power Banks – Best Power Banks with Online Shopping

The Best USB Battery Packs and Power Banks

Top 20 Best Portable Power Banks: Your Easy Buying Guide

Best Power Banks 2017 – Buyer’s Guide

Amazon Best Sellers: Best Portable Cell Phone Power Banks

Best portable phone chargers (June 2017)

10 Best Portable Power Banks for iPhone and Android Phones in 2017

Where to Buy Power Banks

While all the products we ranked above are available on, there are many other places to buy them and many other models. Here are a few sites that sell power banks and other electronics:

So did we miss anything?

What is your top power bank in each of these categories?