What’s the Best Capacity for a Power Bank?

What's the best capacity for power bank IMAGE COM


So you notice that you use your phone a lot and the truth is that you need your phone nearly all the time to complete either your professional or personal goals on a daily basis. There are too many people that think that we need to limit ourselves from phones but the reality is that we rely on them to make life easier. Since the use of them rises, the battery life decreases and at this point you may want to consider getting a Power Bank to better optimize the way you function.

A Power bank is simply a device that holds energy and it’s used to charge devices like your smartphone while on the go. You can learn more about power banks, here.

Getting a power bank should be well thought out because the power bank that you get should match your needs. Are you looking for a power bank to take to the office throughout the week and want to be known as the charging king at work?

Or maybe you just want a personal power bank that you only use while on your adventure when you’re out playing Pokemon GO.

Whatever the circumstance, getting the power bank that serves your needs will greatly impact you by the way it serves you. One of the most vital things about a power bank is the capacity of the power bank. Do you really want to spend money on a 20,000mAh power bank? Or perhaps a just a 3,350mAh power bank?

All the Portable Chargers Mentioned in this Guide:

Last updated on July 7, 2020 10:46 am

What are the Best Lowest Capacity Power Banks?

Let’s think small first. Power banks have come a long way and with them, so have smartphones. With that said, purchasing a power bank that is less than a capacity of 3,000mAh is not acceptable and simply not a good idea because most smartphones nowadays have large capacity batteries, so you’re gonna need a large enough capacity power bank to charge it fully. Also, remember that smartphones are used a lot, you more than likely burn through 1,000mAh of power very quickly.

3,000mAh is a good base for getting a power bank because it also economically makes sense with how low cost and advance they are. Take the Anker PowerCore+ Mini 3350mAh for example:

Anker PowerCore+ Mini 3,350mAh Power Bank


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This power bank has a capacity of 3,350mAh and that is enough to fully recharge a Samsung Galaxy S7. Power banks like the PowerCore+ Mini are great for their size as well, known to be the size of a lipstick, it’s really easy to carry around no matter where you’re going.

3,350mAh capacity is also the base standard for the capacity of small power banks because smartphones have larger batteries and to really have a reliable power bank that is compact and easy to carry, the power should also be there. If you’re going to get lower capacity power banks measuring at about the same battery capacity at 3,000mAh, then you cannot go wrong with the sizes similar to that of the PowerCore+ Mini because it’s a power bank that you can take with you for morning walks or if you’re hitting a gym and you wanna make sure that your music is still pumping throughout your workout.

Read Review for PowerCore+ Mini

Specs of the Anker PowerCore+ Mini:

  • Capacity: 3,350mAh
  • Output: 5V / 1.0A
  • Input: 5V / 1.0A
  • LED Power Indicator: Yes
  • Size: 3.7 x 0.9 x 0.9in
  • Weight: 3 ounces
  • 18-month warranty

Another example of low capacity power banks is the PB-N37 5,000mAh Mini Power Bank

Aukey 5,000mAh Power Bank

These kind of power banks are becoming popular and for good reason; The capacity goes in hand with the portability of the charger. The PB-N37 is a 5000mAh capacity power bank is very similarly designed like the Anker PowerCore+, except that it has a capacity of 5000mAh and has a large circumference because of it.

So if you’re searching for a power bank that you alone can use and can be highly reliable with, you should use a capacity of 3,000mAh to 5,000mAh because the capacity is well within charging your device to the fullest and the design of power banks with those capacities are extremely portable and makes them easy to carry. Of course, even with the small electronics like these, you can still take advantage of the Smart Charging Technology that companies like Anker and Aukey use with their products.

Read Review for Aukey PB-N37 5000mAh Mini Power Bank

Specs of the Aukey PB-N37 5000mAh Mini Power Bank:

  • Capacity:            Advertised: 5,000mAh             Real Capacity: 4,000mAh
  • Output:      5V/1.5A
  • Input: 5V/1.0A via Micro USB Input
  • LED Power Indicators: Single LED Light with different colors to indicate different charging sections
  • Size: 3.6 x 1.18 x 1.18 inches
  • Weight: 4.64 ounces

Jackery Air 6 Slim Power Bank

One of the other most useful form factors when it comes to power banks with low power capacities is that they come in slim form factor. So mini power banks like these are basically able to resemble the same size and weight of your smartphone. This Jackery Air 6 Slim power bank does that. That’s because it has a length of 4.6 inches, and a thickness of 0.3 inches. Charging power of this power bank is on the low side of course, as this charger has a 3,000mAh power capacity. There’s a single output used with this charger and it has a charging speed of 5V/1.0A, and the recharging speed is 5V/2.0A through its Micro-USB input port.

That said, because of its very small size, you’re able to fit this power bank and your smartphone into the same pocket if you wanted to.

Read Review for Jackery Air 6 Slim Power Bank

Specs of the Jackery Air 6 Power Bank:

  • Capacity:                 Advertised Capacity: 3,000mAh        Output Capacity: 2,500mAh
  • Output:  5V/1.0A
  • Input: 5V/2.0A  Via Micro-USB
  • LED Power Indicators: Single LED Indicator with Color Variants
  • Size: 4.6 x 0.3 x 2.4 inches
  • Weight: 3.4 Ounces

What are the Best Medium Capacity Power Banks?

Going into the higher capacity power bank bracket, it’s important to know that if you’re wanting to get these capacity power banks, then you most likely have other people that are gonna want to use the same power bank with you and if not, that’s okay too because power banks within this category are also great for individuals.

Medium capacity power banks are in the 6,000mAh to 15,000mAh battery capacity. These kinds of power banks are best for overall scenarios, whether you’re someone that just want a personal power bank to charge your one device or the many devices you own. The capacity for these power banks is best to charge either one device multiple times or even charge multiple devices a few times.

If you’re going someplace that’s gonna require you to have your phone charged and if it’s gonna be a while before you can really rely on a wall charger for charging, then medium capacity power banks are the best option.

Anker Astro E1 6,700mAh Power Bank

Is a great example of very high capacity that can be trusted with for a long duration of time. Boasting a 6,700mAh capacity, the 2nd Gen Astro is able to charge many devices about two times over and some even into the three-time bracket.

It’s a power bank made for the individual adventurer in mind with the thought that others may need it also. This is because you’re most likely going to have leftover power with such a high capacity power bank and it’s great to share it with other people, even though it doesn’t have more than one charging port. Its small design allows it to be portable in nearly every way by fitting in just one hand easily.

Then there’s the other spectrum of medium-sized power banks; This side of power banks are more robust that feature higher capacity and more options when it comes to charging. Higher capacity power banks are going to feature more charging ports so that more devices can be charged at the same time. With better innovation, portability with these higher bracket capacity power banks really doesn’t change all that much.

Read Review for Anker Astro E1 5,200mAh

Specs of the Anker Astro E1 6700mAh:

  • Capacity:   6,700mAh
  • Output:   5V/2.0A
  • Input:   5V/1.0A
  • LED Power Indicators: Four-LED Power Indicators
  • Size: 3.8 × 1.7 × 0.9 inches
  • Weight: 4.16 ounces
  • Comes with Micro-USB Cable

KMASHI 10,000mAh Power Bank

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The KMASHI 10,000mAh power bank features two USB ports that allow for two devices to charge at the same time. Power banks like these are basically what the epitome of what someone could get in terms of individual usage of a power bank and if someone else wanted to charge their device at the same time as yours. The size of a the KMASHI 10,000mAh is the greatest selling point because it’s about the size of an iPhone 6s; Combine the physical size and the capacity size that you’re getting and you’ve got a trustworthy power bank that is ready to go on quite a long adventure.

Within the same power capacity, you can also get the implementation of specialized charging technology like Qualcomm Quick Charge.

Read Review for KMASHI 10000mAh External Battery Bank

Specs of the KMASHI 10000mAh External Battery Power Bank:

  • Capacity: 10,000mAh
  • Output:              Output 1 – 5V/1.0A     Output 2 – 5V/2.1A
  • Input: 2.0A via Micro USB Input
  • LED Power Indicators: Four-LED status system
  • Size: 6.8 x 4.8 x 0.9 inches
  • Weight: 9.8 ounces
  • Comes with a 8 Inch Micro-USB Cable and User Manual

EasyAcc MegaCharge 16,750mAh USB-C Power Bank


EasyAcc has a very useful portable charger within the mid-range of power banks. It’s called their MegaCharge 16,750mAh portable charger. It has a good amount of power capacity that can be useful for charging smartphones and tablets to full power a few times over. The charging power from the ports of this charger is especially good, with its two USB-A ports. One port uses Quick Charge to charge Quick Charge compatible devices at their max charging speed. The other port has a standard charging speed of 5V/3.0A. Recharging this portable charger is another great part of it.

When it comes to recharging this power bank, there are two input ports that you can use. There’s a Micro-USB and USB-C input port. The USB-C input has a recharge speed of 5V/3.0A and the Micro-USB input has a recharge speed of 5V/2.0A. You can use both of the input ports at the same time, and that can result in a recharge speed of 5A.

Read Review for EasyAcc 16,750mAh Power Bank with Quick Charge

Specs of the EasyAcc MegaCharge 16,750mAh USB-C Power Bank:

  • Capacity:            Advertised: 16,750mAh            Output Capacity: 12,400mAh
  • Output:  

Smart Charge USB Port: 5V/3.0A

Quick Charge Port: 5V/3.0A – 5-6V / 3A, 6-9V / 2A, 9-12V / 1.5A

Max Output: 5V/6.0A

  • Input:

Type-C Input Port: 5V/3.0A

Micro-USB Input Port: 5V/2.0A

  • LED Power Indicators: 4 LED Dotted Power Capacity Indicators
  • Size: 5.3 x 3 x 0.9 inches
  • Weight: 10.9 Ounces

Crave PLUS 10,000mAh Slim Aluminum Power Bank with Quick Charge & Type C

Most of the time when we think about power banks that have mid-range power capacities, they’re not exactly the smallest of portable chargers. That said, this Crave PLUS portable charger and a couple of other chargers on the market don’t follow that rule. This Crave PLUS portable charger has a 10,000mAh power capacity and yet it has a form factor that basically makes it have the size of a smartphone. The charger has a length of 6.2 inches, a width of 3.1 inches and a thickness of 0.4 inches. Very small and yet it’s also very powerful.

There are two output ports on this power bank, with it using a Quick Charge USB-A port and another output port is a USB-C port, which can be used with a USB-C to USB-C charging cable to charge USB-C compatible devices. Recharging this power bank is also versatile because there are two input ports, with one being the Micro-USB and USB-C input.

Crave PLUS 10,000mAh Aluminum Power Bank with Quick Charge and USB-C

Specs of the Crave PLUS 10,000mAh Slim Aluminum Power Bank with Quick Charge & Type C:

  • Capacity:

Initial Capacity: 10,000mAh

Output Capacity: 7,400mAh

  • Output:

USB-A Port: Quick Charge Speed for compatible devices or 2.4A for Non-Compatible Quick Charge devices

USB-C Port: 5V/3.0A

  • Input:

Micro-USB or USB-C input: 5V/2.4A

  • LED Power Indicator: 4 White LED Power Capacity Indicators
  • Size: 6.2 x 3.1 x 0.4 inches
  • Weight: 9 Ounces

Anker PowerCore 10000 Portable Chargerpic-1

Another veyry small portable charger on the market that has a good amount of power capacity is the Anker PowerCore 10000 portable charger. This charger has a good amount of power capacity that can charge smartphones to full power multiple times over. Charging a single device with this power bank is only possible, because this PowerCore 10000 charger uses a single USB-A port. The port has a charging speed of 5V/2.4A.

The size of this charger is also very small with its length of 3.6 inches and a thickness of 0.9 inches. So, length-wise, this charger is actually smaller than a smartphone.

Read Review for Anker PowerCore 10000 Portable Charger

Specs of the Anker PowerCore 10,000 Portable Charger:

  • Capacity:            Advertised: 10,000mAh             Real Capacity: 8,000mAh
  • Output:   Max Output: 5V/2.4A
  • Input: 5V/2.0A Via Micro-USB Input
  • LED Power Indicators: 4 LED Dotted Power Capacity Indicators
  • Size: 3.6 x 2.4 x 0.9 inches
  • Weight: 6.4 Ounces

What are the Best Higher Capacity Power Banks?

Going into the higher capacity power banks, these kind of power banks are where portable chargers are basically portable generators of power that can last for days for providing battery power to your devices. These kind of large capacity chargers are also where the latest in technology can be implemented because the capacity of the power bank is already great, so implementing the best tech for charging can only make the power bank better.

These kinds of chargers can still be portable but power banks in this bracket of capacity are really meant for taking them to some place or being in an area where you are comfortable to stay while charging your device and not exactly for on the go purposes but if needed, nearly every power bank out there is portable enough to take basically anywhere.

In this area of power banks, we’re dealing with the capacity of 15,000mAh to as high as they can go for everyday purposes. These kinds of large capacity power banks will be bigger and have longer lengths too.

Since the capacity is so great within these chargers, having a more than one charging port makes sense, take for example the Anker Astro E7 26,800mAh Portable Charger

Anker 26800mAh Portable Charger

Having a capacity of 26,800mAh, the Astro E7 power bank is able to charge nearly any portable device well into the 4 times range. The power bank has 3 USB ports for charging and all them have PoweriQ, which is Anker’s smart tech charging technology. With 3 ports and a capacity that big, the Astro E7 is a power bank that can be used for quite possibly days or weeks depending on how heavily it’s used.

If the power bank is being used only individually, then it’s gonna last a long time for just one charge. However, this is one of those power banks for charging multiple devices at the same time, which is great because we’re talking about charging your phone, tablet and wearable watch all at the same time. It’s also great to use if friends or colleagues need charging and there are three ports, so why not?

Read Review for Anker PowerCore 26800 Portable Charger

Specs of the Anker PowerCore 26800 Portable Charger:

  • Capacity:         Advertised Capacity: 26,800mAh               Real Capacity: 24,400mAh
  • Output:     Per Port – 5V/3.0A            Max Output – 6A
  • Input: 5V/2.0A Per Micro USB Input            4A Total if both Micro-USB Inputs are used
  • LED Power Indicators: Four-LED status system
  • Size: 7.1 x 3.2 x 0.9 inches
  • Weight: 1.1 pounds
  • 18-month warranty

Anker has also made a Qualcomm Quick Charge variant of the Astro E7 that you can check out here: PowerCore+ 26800 & PowerPort+ 1 

With these higher capacity power banks comes the way which tech is used and ultimately, since the size of a power bank is bigger, this allows for more things to be done. What does this even mean? Take a look at another high capacity charge from RavPower: 20100mAh External Battery

RAVPower 20100mAh Power Bank with Quick Charge 3.0

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Most portable chargers only feature a Micro-USB port for recharging purposes but the RavPower 20,000mAh power bank has the option to recharge the power bank using a USB Type-C. This is pretty cool because charging with the Micro USB cable will usually only give the power bank a 2.0A current of charging but with the USB Type-C charging path, charging is done with a current of 3.0A. This charging is significantly faster and it’s basically like recharging a power bank with Quick Charge technology. Recharging a power bank faster so that you can get back to recharging your own devices faster. How cool is that?

The Power bank also features a Quick Charge 2.0 charging port and an iSmart charging port. This power bank is definitely high on the list pertaining to quality because all the options of charging with this power bank are quite literally about speed and in the end, that’s all that really matters when it comes to charging.

Read Review for RAVPower 20,100mAh Power Bank with Quick Charge 3.0

Specs of the RAVPower 20,100mAh Power Bank with Quick Charge 3.0:

  • Capacity:            Advertised: 20,100mAh            Real Capacity: 17,100mAh
  • Output:  iSmart Port: 5V/2.4AQuick Charge port: 5V/2.4A, 6.5V-9V/1.5A, and 9V-12V/1.2A

USB-C: 5V/3.0A

  • Input: 5V/2.0A Via Micro-USB Input      5V/3.0A Via USB-C Input
  • LED Power Indicators: 4 LED Dotted Power Capacity Indicators
  • Size: 6.8 x 3.1 x 0.8 inches
  • Weight: 13 Ounces

Of course when it comes to charging with higher capacity power banks, pushing the barrier is what it’s all about too.

The EasyAcc Monster 20000mAh is able to achieve that.

EasyAcc Monster 20,000mAh

EasyAcc Power Bank 20000mAh


With a high capacity, comes more options to charge. Four ports that are Smart Tech enabled allows for charging up to four devices at the same time. Not only are options to charge your devices pretty good. The EasyAcc Monster 20,000mAh features 2 Micro USB ports that allow the user to insert 2 Micro USB cables into the power and charge the power bank two times faster than just one Micro USB recharging the power bank.

EasyAcc also has a higher capacity power bank called the EasyAcc Monster 26,000mAh that features all the same charging aspects as the 20,000mAh model, but the only thing that’s a little different is the size, as a way to compensate for the larger capacity of the power bank.

Read Review for EasyAcc Monster 26,000mAh

Specs of the EasyAcc Monster 26,000mAh Power Bank:

  • Capacity:            Advertised: 26,000mAh             Real Capacity: 22,000mAh
  • Output:      Per Port: 5V/2.4A     Max Output: 4.8A
  • Input:        2 Micro-USB Input Ports   /   Per Port: 5V/2.0A  /  Max Input:4.0A
  • LED Power Indicators: 4 LED Power Indicators
  • Size: 6.6 x 3.1 x 0.9 inches
  • Weight: 1.2 Pounds

Aukey 30,000mAh Power Bank with Quick Charge 3.0 and USB-C

On the very high power capacity spectrum, Aukey has this 30,000mAh power bank. Yes, 30,000mAh of power capacity that you can use to charge smartphones and tablets multiple times. If you’re just using this power bank for charging smartphones then you can very well go a week without having to recharge it. There are three output ports on this power bank. With two being USB-A ports, and the one other is a USB-C port. One of the USB-A ports features Quick Charge 3.0 that can charge Quick Charge compatible smartphones at their max charging speed.

Recharging this power bank can be done through two input ports. It has a Micro-USB input and a USB-C input port that can both be used together and result in a 4A recharge speed.

Read Review for Aukey 30,000mAh Power Bank with Quick Charge and USB-C

Aukey 30,000mAh Portable Charger with Quick Charge 3.0:

  • Capacity:            Advertised: 30,000mAh             Output Capacity: 27,000mAh
  • Output:

Quick Charge 3.0 Port Charging Speeds: 3.6V-6.5V/3A, 6.5V-9V/2A, 9V-12V/1.5A

AiPower Port Charging Speed: 5V/2.4A

USB Type-C Output Port: 5V/3.0A

  • Input:

USB Type-C Input Port: 5V/2.0A     Individual Usage: 5V/3.0A

Micro-USB Input Port: 5V/2.0A       Individual Usage: 5V/2.4A

  • LED Power Indicators: Power Button Indicates 3 Colors
  • Size: 5.9 x 3.3 x 1.1 inches
  • Weight: 1.4 Pounds

The use of Power Delivery with High Capacity Power Banks

Anker PowerCore+ 26800 Power Delivery Portable Charger

When you go into the high capacity power range, then that’s when you also get fast charging tech such as Power Delivery. If you don’t know, Power Delivery is basically fast unviersal charging tech, or at least that will be the case when we keep moving forward into the future. That’s because Power Delivery is fast charging that is being used with USB-C, and USB-C is a new standard for connectivity and charging.

This Anker PowerCore+ 26800 portable charger is one of the best high capacity power banks that features Power Delivery that you can get. So, as we mentioned, it does have a very high power capacity that can charge smartphones, tablets, and because this charger features Power Delivery, you’re also able to charge laptops to full power too. There are a total of three output ports on this power bank. It has two USB-A ports, with each of them outputting 5V/3.0A. The USB-C Power Delivery output on this power bank has 30W of charging power.

When it comes to recharging this power bank you can also use the USB-C Power Delivery port to recharge it and the best part is that this charger comes with a Power Delivery wall charger so you can recharge the power bank at its max charging speed.

Read Review for Anker PowerCore+ 26800 Power Bank

Specs of the Anker PowerCore+ 26800 Power Bank with 30W Power Delivery Charger:

  • Capacity:

Initial Capacity: 26,800mAh

Output Capacity: 20,000mAh

  • Output:

Both USB-A Charging Ports: 5V/3.0A

USB-C Port: 30W

  • Input: 30W through USB-C input with USB-C Wall Charger
  • LED Power Indicator: Yes
  • Size: 6.5 x 3.1 x 0.9 inches
  • Weight: 1.3 Pounds

iMuto 20,100mAh Power Delivery Portable Charger with Quick Charge

Another type of Power Delivery portable charger is this iMuto 20,100mAh Power Delivery portable charger. It has less power capacity that can be used, but at the same time, the charging power from this power bank is better when it comes to its Power Delivery charging. There’s a USB-A port and a USB-C Power Delivery port on this charger. The USB-A port features Quick Charge 3.0 and the USB-C Power Delivery charging speed is 45W. The standard when it comes to Power Delivery is 30W, so this iMuto portable charger has 15W more of charging power.

Read Review for iMuto 20,100mAh Power Delivery Portable Charger with Quick Charge

Specs of the iMuto 20,100mAh 45W USB-C Power Delivery Portable Charger:

  • Capacity:

Initial Capacity:  20,100mAh

Output Capacity: 15,000mAh

  • Output:

USB-C Power Delivery: 5V-20V/2.25A (45W)

USB-A Quick Charge Port: 5V/3A | 9V/2A

  • Input:

USB-C Power Delivery Input: 5V-20V/2.25A (45W)

Micro-USB Input: 5V/2.1A

  • LED Power Indicator: 4 Blue LED Power Capacity Indicators
  • Size: 6.3 x 3 x 0.8 inches
  • Weight: 13 Ounces

So what is the Best Capacity for a Power Bank?

It’s gonna depend on which one you get.

Small capacity Power Bank: Focus on sizes that are in the 3,000mAh to 5,000mAh range because these kinds of power banks are small, powerful, feature a good capacity of power and are extremely portable to be taken nearly everywhere.

Medium capacity Power Bank: Capacities that are about 6,000mAh to 15,000mAh are good because they are able to provide a sufficient power to charge your device a few times over. They may also have two ports or maybe more to charge more devices at the same. This is where specialized tech comes in, so you can take advantage of technology like Quick Charge.

Large Power Bank: Large power banks are in the 15,000mAh or larger range. These power banks can last on one charge for quite a long time and the anxiety of your power bank running out of a charge is nearly nonexistent because of the absurd large capacity of the power bank. Power banks of this capacity are bigger in size and because of that, they will most likely feature 2 or more charging ports and maybe even more than 1 port to recharge the power bank itself. These power banks can charge many devices at the same time and are great for sharing. They will feature the latest in charging tech because the size of the power bank will allow for more innovation.

Conclusion: Power banks will ultimately depend on what you need.

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