Best Portable Battery Chargers For Cell Phones

Best Portable Battery Chargers For Cell Phones

It is common to carry your smartphones, laptops, tablets, etc. while traveling or if you have a camping plan. Indeed, these devices have become essential in our lives and we cannot imagine even a minute without them.

So, it becomes very hectic when these devices run out of batteries. To avoid any inconvenience in such a situation, you have to get the best portable battery chargers for cell phones and take them anywhere you go.

Best Powerbanks between 8.000mAh and 21.000mAh

A suitable power bank is one that can fulfill your needs. If you only need to charge your phone once until you have access to a plug, then you should consider a power bank with a capacity anywhere between 3.000-8.000mAh.

But, if you are looking to charge larger devices, i.e., laptops and tablets and maybe do it multiple times or keep a good battery reserve left, then you must consider power banks with capacities ranging from 8.000-21.000mAh.

Most of these chargers have capability to charge multiple devices at a time and can charge most smartphones many times.

In this article, we will review some power banks with capacities ranging from 8.000mAh to 21.000mAh. We will look at their specs and features and compare them.

Then, we will recommend the best value charger for you and give suggestions regarding which one should be used in which situation.

In a hurry? Here’s our best tip:

Get the iWalk Secretary+ Charger. It is light, portable, and has a sufficient capacity to charge your devices.

It has the best charging and recharging speeds with multiple options and some of its ports are Quick Charge and Power Delivery capable. Besides, it can charge 3 devices simultaneously without losing speed.

Although it has two built-in output ports which can break, it has two other more advanced output ports as well. If you somehow lose the built-in cables you have other options available.

This device has also an affordable price making it the best value for money among the mentioned power banks.

Table of Contents

  1. Best Powerbanks between 8.000mAh and 21.000mAh
    1. iWalk Secretary+ 10.000mAh
    2. Lezchi 10.000mAh
    3. FosPower PowerActive 10.200mAh
    4. Anker PowerCore 13.000mAh
    5. Yelomin 20.000mAh
    6. Anker PowerCore 20.100mAh
    7. RAVPower 20.100mAh
  2. Wrap-up

Comparison table:

Product NameCapacity
Input / Output
Output ChargeType of Output Ports
iWalk Secretary+10 0002 / 35V/2.4A, 9V/1.5A, 12V/1AMicro USB, USB C and and USB Output (with QC 3.0);
Also has Power Delivery port
Lezchi10 0002 / 45V/2.1A each (max output of 5V/2.1A)2 built-in USB cables, 1 built-in lightning cable and USB port
FosPower PowerActive10 2001 / 15V/2.1AUSB
Anker PowerCore13 0001 / 25V/3A per portUSB
Yelomin20 0002 / 25V/2.1A (one device, output max 2.1A)
or 5V/2A (two devices, each output 1A)
Dual USB
Anker PowerCore20 1001 / 25V/4.8A (2.4A max per port)USB
RAVPower20 1001 / 35V/3A USB C and 5V/2.4A iSmart USBType C + USB + AC Outlet
Best Portable Battery Chargers For Cell Phones - iWalk Secretary+ 10.000mAh

Click the image to check the price on Amazon now!

iWalk Secretary+ 10.000mAh

Main highlights:

  • 10.000mAh battery
  • 3 output ports (5V/2A, 9V/1.5A, and 5V/2A)
  • 1 input port (QC 3.0)
  • Built-in output cables
  • Quick charge and Power Delivery capable

This power bank has a small size as compared to units with 10.000mAh. It is extremely small, efficient, portable, and can easily fit into your pocket.

It gives quick charge and recharge speeds. It has 3 output ports, 2 of them are built-in cables, a USB C cable, and a micro USB with a lightning connector adapter.

They provide a charge of (5V/2A, 9V/1.5A) and 5V/2A. The third is a USB output that is compatible with a Quick Charge (QC) 3.0. It features 1 micro USB input port which is compatible with QC 3.0. Also, it has one input/output port capable of PD (Power Delivery) and QC 3.0.

The Secretary+ can charge 3 devices at a time and has support for Quick Charge through some of its ports. It takes only 3.5 hours to recharge it through PD input (18W). Pass-through charging is supported and a number of protections are mentioned in the table.

It also has a video stand that helps you to watch movies and charge the phone without holding it in your hand. Besides, it supports iPhone X,8, 7, 6S, 6 Plus, iPad, Samsung Galaxy S8, S7, S6, S5, Note, and also MacBook, if you have the specific connector for it.


  • Compact design – light and portable
  • Compatible with Power Delivery (PD) and Quick Charge (QC 3.0) to deliver fast charge for any device
  • Can charge 3 devices simultaneously like a charging station
  • Supports pass-through charging
  • Has a video stand


  • Built-in cables can’t be replaced
Best Portable Battery Chargers For Cell Phones - Lezchi 10.000mAh

Click the image to check the price on Amazon now!

Lezchi 10.000mAh

Main highlights:

  • 10.000mAh battery capacity
  • 4 output ports (5V/2.1A)
  • 2 input ports (5V/2.1A, AC plug 110-240V)
  • Built-in output cables

The Lezchi power bank is beautifully designed with 2 built-in USB cables, 1 built-in lightning cable, and a USB port. In total it has 4 output ports each delivering a charge of 5V/ 2.1A. Using this charger you can power 4 devices simultaneously at a good charging speed.

Also, it has 2 input ports. A micro-USB port through which you can charge the power bank at an input charge of 5V/2.1A using the charging cable. It also has a built-in AC plug (110-240V) to recharge it by directly connecting to an AC socket in about 6-7 hours.

This power bank uses lithium polymer batteries which greatly reduce current loss and make it safer. Also, the AC plug gives a constant input charge to the battery, extending its life.

It also supports pass-through charging and features a number of safety protections. Has undergone several safety tests during its manufacture which enhance its safety. It supports multiple smartphones, iPads, tablets, laptops, etc.


  • Built-in AC plug for charging
  • 4 output ports for charging 4 devices at a time
  • Supports pass-through charging
  • Reliable battery


  • Built-in cables can’t be replaced
Best Portable Battery Chargers For Cell Phones - FosPowerPowerActive 10.200mAh

Click the image to check the price on Amazon now!

FosPower PowerActive 10.200mAh

Main highlights:

  • 10.200mAh battery capacity
  • 1 output port (5V/2.1A)
  • 1 input port (5V/2A)
  • Water / shock / dust proof
  • Pass-through charging

This is a rugged power bank with a small size and light-weight. It can withstand falls and shocks that would leave normal chargers damaged. When its cover is closed, it is waterproof and dust-tight. It’s known for its build quality and is designed specifically for people who like traveling, adventures, and camping.

It has a capacity of 10.200mAh and a good conversion rate thanks to its Panasonic battery cells. The charging capacity is unlikely to go down because it has one output port. Meaning that less current is withdrawn from it at a time and thus less heat is generated. So, the cells do not lose their charging capacity.

Having just 1 output port is an odd feature for a power bank with such a big capacity. You usually expect at least 2 output ports in chargers this size. However, this is not without advantages, as it generates less heat.

The single output port gives a pretty good charging speed of 5V/2.1A. Besides, it has a single input port with an input charge of 5V/2A which recharges this power bank in a suitable time of 5 hours.

This device has support for pass-through charging and several protections like over-charge, over-current, and over-heat. It comes with an LED flashlight, a compass, and a carabiner. The rugged construction is one of its main advantages.


  • Tough and rough power bank
  • Has a latch for attaching a compass and carabiner to it
  • Good conversion rate


  • Only one output port

The following product is currently unavailable on Amazon. Sorry for any inconvenience.

Anker PowerCore 13.000mAh

Main highlights:

  • 13.000mAh battery capacity
  • 2 output ports (5V/3A and 5V/1,5A if both in use)
  • 1 input port (5V/2A)

This power bank has a very small size for a relatively large capacity of 13.000mAh. If it is used for charging only a single device, then it has a really good conversion rate of 93% and according to the actual capacity of 12.000mAh. However, if two devices are connected at the same time, its actual output capacity can drop to 10.500mAh, which is still a great figure.

The device has two output ports with a total output of 5V/3A. If two devices are connected to it, the output charge is divided between the two ports and the charging speed reduces. This charger does not provide a good output charging speed when two high-consumer devices are connected.

Also, the charger has a single input port with a good input charge of 5V/2A and a recharge time of 5.5-6 hours.

This power bank is rugged. It’s shockproof and can withstand high temperatures. It also has a matte finish which enhances grip. At the same time, it prevents smudges and fingerprints.

The charger automatically starts powering a device when it is connected and stops when it’s removed. Supports PowerIQ and VoltageBoost Technology ensuring high-speed charging for all your devices. It also prevents cable resistance from slowing your charging speeds.

It features a multi-protect safety system, namely, surge and short-circuit protection.

It’s compatible with many laptops, smartphones, and tablets but it won’t charge devices with an input below 50 mA like some GPS and Bluetooth.

Pass-through charging is not supported.


  • Portable but large capacity
  • Strong construction and great design
  • Great conversion rate with just one connected device


  • Conversion rate and charging speed drop considerably with two connected devices
  • Does not support pass-through charging
Best Portable Battery Chargers For Cell Phones - Yelomin 20.000mAh

Click the image to check the price on Amazon now!

Yelomin 20.000mAh

Main highlights:

  • 20.000mAh battery capacity
  • 2 output ports (5V/2.1A, 5V/1A)
  • 2 input ports (5V/1.5A)
  • Solar recharging
  • Water / dust / shockproof

It is a rugged solar power bank made up of Acrylonitrile Butadiene Styrene (ABS) + Polycarbonate(PC) + Silicone material which protects it from dirt, rain, and other shocks. This device features intelligent security protection for over-current, over-charge, over-load, and short circuits. It can recharge through solar energy which makes it ideal for outdoor activities like camping, hiking, cycling, etc.

It has two output ports with an output charge of 5V/2.1A and 5V/1A respectively to charge two devices at a time.

Also, it has two Micro-USB input ports with an input charge of 5V/1.5A each. One port is to recharge it through the power cable and the other is to recharge it through an external solar panel. 8-10 hours will usually be necessary for a full recharge.

It does support pass-through charging and has an LED light for emergency use. It also has the possibility to attach a carabiner.

Having a capacity of 20.000mAh allows the user to charge various devices on a single charge, with its solar panel giving it some extra battery life.


  • Recharging through solar energy
  • Can charge multiple devices at a time
  • Emergency LED light
  • Tough and rugged
  • Big battery capacity


  • Not very fast charging and recharging speeds
  • No pass-through charging
Best Portable Battery Chargers For Cell Phones - Anker PowerCore 20.100mAh

Click the image to check the price on Amazon now!

Anker PowerCore 20.100mAh

Main highlights:

  • 20.100mAh battery capacity
  • 2 output ports (5V/2.4A)
  • 1 input port (5V/2A)
  • PowerIQ and VoltageBoost Technology

This charger is one of the best among the high-capacity portable power banks. It has a power capacity of 20.100mAh and the overall output capacity of around 15.000mAh. It can charge smartphones multiple times, many tablets almost 2 times, and can even fully charge laptops.

Despite being large in size compared to other power banks discussed here, its flat cylindrical design is very slim making it easy to hold in hand. It’s finished in matte which enhances grip and doesn’t leave smudges or fingerprints.

The charging speeds shine among its competitors with similar capacity and size. It has two USB output ports with a maximum output of 5V/2.4A each. This means that it can simultaneously charge two devices at the amperage of 2.4A which is really outstanding. Using this charger, you can simultaneously charge two iPads at 2.4A, i.e., their max speeds.

The recharging speed of 5V/2A through its single Micro-USB input port is not that bad; however, it is on the shorter side considering its capacity. This power bank also features PowerIQ and VoltageBoast technology like other Anker power banks. The Anker PowerCore 20.100mAh has a good safety system which gives it surge and short-circuit protection.

Nonetheless, it does not support pass-through charging. It is compatible with the MacBook 2015 (USB-C to USB 2.0 cable needed), Apple and Android smartphones, tablets (including the Nexus 7), and other USB-charged devices except for the iPod nano, iPod Classic, HP TouchPad, Dell Venue 11 Pro, Asus tablets and some GPS and Bluetooth devices.


  • Great design
  • High-Speed Charging with PowerIQ
  • Faster charging for 2 devices connected simultaneously


  • Takes 10-12 hours to recharge
  • Does not support pass-through charging
Best Portable Battery Chargers For Cell Phones - RAVPower 20.100mAh

Click the image to check the price on Amazon now!

RAVPower 20.100mAh

Main highlights:

  • 20.100mAh battery capacity
  • 3 output ports (5V/3A, 5V/2.4A, AC Outlet 110/220V)
  • 1 input port (19V 1.6A DC)

This power bank is shaped like a smart speaker with air holes at the top and bottom for passive cooling. The entire body is coated in a hard-rubberized coating in such a way that fingerprints do not appear and it won’t slip out of your hand. It is not a rugged device and has a capacity of 20.100mAh.

This RAVPower unit has 3 output ports:

  • A USB Type-C port with an output charge of 5V/3A which allows very fast charging;
  • A common type-A USB port with an output charge of 5V/2.4A which is equipped with iSmart technology to give optimal charging;
  • And an AC-outlet which is a two-pronged plug with ratings up to 65W 110V for US models and a three-pronged plug with rating up to 65W 220V for UK models;

The charging through an AC outlet is faster but the power ratings of the connected device must be kept in mind before connecting them to the AC outlet.

The power bank has only one input port to recharge it, through the 19V 1.6A DC charger. There is no micro USB (or USB Type-C) port.

A full recharge takes 4-5 hours and the device gets warm during the process.

It does support pass-through charging and has several safety protections such as overcharge, short circuits, current surge protections, and heat dissipation vents.

Also, it supports laptops, tablets, smartphones, and many other devices.


  • Fast charging and recharging
  • AC outlet for charging devices
  • Supports pass-through charging
  • Can charge 3 devices at a time


  • No USB input
  • Gets warm during recharge
  • Limited devices can use the AC outlet


We can infer from the above discussion that each power bank has its own positives and negatives. None is perfect in the absolute sense. Where ones provide fast charging and recharging speeds, others feature technologies such as pass-through charging, smart charging, etc.

Each company has manufactured its product keeping in mind some considerations. Some have given preference to a particular set of features while others to another set of capabilities.

However, there are some features that people look for in power banks of considerable price. They may want to charge multiple devices using the power bank and as soon as possible.

All of the above-mentioned power banks have multiple output ports except FosPower. It can charge only one device at a time but if you need a solid and rugged power bank, you should definitely consider it.

Furthermore, the charging speeds of the Anker Power bank with 13.000mAh capacity drop considerably when multiple devices are connected while Anker Power bank with 20.100mAh capacity takes a sufficient amount of time to recharge. These are considerable drawbacks.

n addition, using RAVPower 20.100mAh can give you greater recharging and charging speeds and the capability to charge multiple devices simultaneously. Unfortunately, you can only charge it through its own adapter.

Lezchi Powerbank has 3 out of 4 built-in output ports that can easily break thereby rendering the power bank useless. If you’re putting it through intense use and you need a resistant product, it’s not the most recommended option.

The Yelomin Solar Power Bank is a great option to have under your belt when you have to stay away from a power socket for a long time. It can use its solar recharging feature to facilitate you on long adventurous missions while you are far from a wall plug.

In case you want to learn more about what to look for when choosing the best portable battery chargers for cell phones, check out this article: How to choose the best powerbank.

If for some reason you’re looking for other capacity power banks, check your best solution in our articles on: