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8 Best 4000 Mah Power Bank for 2024


Modified: December 27, 2023

by Denys Briones


In today's fast-paced and technologically advanced world, staying connected to our devices has become more crucial than ever. With the growing reliance on smartphones, tablets, and other portable devices, having a reliable power source on the go is essential. That's where power banks come in. A power bank with a high-capacity battery, such as a 4000 mAh power bank, can provide enough juice to keep you powered up throughout the day. Are you looking for the best power bank to meet your charging needs in 2023? Look no further! In this article, we have compiled a list of the 8 best 4000 mAh power banks that are sure to keep your devices running smoothly and efficiently. Keep reading to find the perfect power bank that fits your requirements and ensures you never run out of power again.

Top Picks:

Overall Score: 8/10

The ODGUV Small Portable Charger is a cute and compact power bank that is perfect for travelers. With built-in cables for both iPhones and Android phones, you can charge your devices anytime, anywhere without the need for an extra data cable. The unique back clip-on design allows for easy one-handed phone use, while the foldable stand keeps your phone upright for comfortable viewing. With a high-quality 4000mAh battery, this portable charger provides enough power for most phones. Its ultra-compact size and excellent portability make it easy to slide into your pocket, wallet, or purse. Overall, it's a reliable backup power supply for daily use.

Key Features

  • Portable Charger Built in Cable
  • Unique Back Clip-on Design
  • Foldable Stand
  • Enough Capacity
  • Excellent Portability
  • What you get


  • Color: Purple
  • Dimension: 2.50Lx2.10Wx1.10H


  • Built-in cables for i Phone and Android
  • One-handed phone use with back clip design
  • Foldable stand for comfortable viewing
  • High-quality 4000m Ah battery


  • May get hot while using
  • Some reported issues with holding a charge
  • Difficult to open without tools

The ODGUV Small Portable Charger is a convenient and stylish power bank for travelers. Its built-in cables, back clip-on design, and foldable stand make it a versatile accessory. While some users experienced issues with holding a charge or difficulty in opening, overall, it provides reliable backup power for most phones. Its small size and lightweight nature make it highly portable, fitting easily into pockets and purses. With a cute purple color and compatibility with various devices, this power bank is a handy accessory to have when on the go. Just be mindful of any potential heating issues while using.

Overall Score: 9/10

The DEWBU Mini Portable Charger is an ultra-slim and compact power bank that is perfect for travel. With its high-quality internal battery cells, it is smaller than a credit card, fitting easily into your pocket or handbag. The easy-to-use power button with four blue light indicators shows the remaining power and charging status. This small power bank supports almost all smartphones and includes a USB-C port for charging iPhone, iPad, MacBook, Galaxy, Huawei, Switch, DEWBU heated gloves, and other devices. It is certified safe with built-in multi-protection against over-current and short circuits. The DEWBU Mini Portable Charger comes with a 4000mAh power bank, USB charging cable, and instruction booklet. Overall, it is a convenient and reliable travel accessory.

Key Features

  • Ultra-Compact & Slim
  • Battery Level Display
  • Wide Compatibility
  • Certified Safe
  • What's Included: 5V/2A 4000m Ah Power Bank1, USB Charging Cable1, Instruction Booklet *1


  • Size: 1 Count (Pack of 1)


  • Small and portable
  • Battery level indicator
  • Wide compatibility
  • Certified safe


  • No cable included for barrel-type connector
  • Limited capacity compared to larger power banks

The DEWBU Mini Portable Charger is a compact and reliable power bank for travel. Its slim design and wide compatibility make it convenient for charging smartphones and other devices on the go. The battery level indicator allows for easy monitoring of the remaining power. The only drawbacks are the lack of a cable for the barrel-type connector and the limited capacity compared to larger power banks. However, for its portability and functionality, it is highly recommended as a travel accessory.

Overall Score: 7.5/10

Experience immersive sound with the VR3 Portable Power Bank. This compact Bluetooth speaker features high-power dual-2 speakers and a passive radiator, delivering dynamic and energetic sound. Whether you're at home or on the go, this speaker provides a superior audio experience. It has a large capacity 4000mAh battery that allows you to charge your phone or other devices while you listen to music, and its wireless compatibility lets you connect to various devices using Bluetooth 5.0 technology. With convenient controls for playback, volume, and calls, you can easily switch tracks or answer calls without reaching for your phone. The package includes the VR3 Portable Wireless Speaker, micro-USB cable, 3.5mm audio cable, and user manual. Get ready for more than 35 hours of playtime with this versatile and stylish speaker.

Key Features

  • Large capacity 4000m Ah battery for charging devices
  • High-power dual-2 speakers and passive radiator for dynamic sound
  • Wireless compatibility with Bluetooth 5.0 technology
  • Convenient controls for playback, volume, and calls
  • Includes micro-USB cable, 3.5mm audio cable, and user manual


  • Color: Black
  • Dimension: 6.00Lx3.00Wx1.00H


  • Compact and portable design
  • Immersive and energetic sound
  • Long playtime of more than 35 hours
  • Can charge devices while playing music
  • Wireless connectivity with Bluetooth 5.0
  • Convenient controls for easy operation


  • Slow response time on the control panel
  • Battery lasts only 4 hours
  • Lack of bass in the sound
  • Power supply may not fully charge a phone

The VR3 Portable Power Bank with Bluetooth is a versatile and reliable speaker that offers excellent sound quality and functionality. Its compact size and long playtime make it a great companion for both home and travel use. The ability to charge devices while listening to music is a convenient feature, although the battery life could be improved. The control panel’s slow response time may be frustrating for some users, but overall, this speaker provides an immersive audio experience. If you’re looking for an affordable and portable Bluetooth speaker with a power bank function, the VR3 Portable Power Bank is a solid choice.

Overall Score: 8.5/10

The FosPower 4000mAh Emergency Radio is a versatile and reliable travel accessory for emergency situations and camping trips. This compact radio not only provides access to AM/FM radio broadcasts, but also features a built-in flashlight and reading light for added convenience. With its 4000mAh power bank, it can also keep your USB devices charged in case of an emergency. The radio can be powered by three different sources – hand crank, solar panel, or micro-USB cable, ensuring that you always have a source of power. It also has an SOS alarm function that can be used to call for help during emergencies. The FosPower Emergency Radio is a must-have for any traveler or outdoor enthusiast.

Key Features

  • 4000m Ah power bank to keep devices powered
  • 3 power sources: hand crank, solar panel, micro-USB
  • SOS alarm and 2 light sources (flashlight and reading light)
  • NOAA emergency weather broadcast access
  • Limited lifetime warranty


  • Color: Orange
  • Dimension: 6.23Lx2.48Wx3.19H


  • Versatile power sources
  • Compact and portable design
  • SOS alarm for emergencies
  • Full access to AM/FM radio broadcasts
  • Limited lifetime warranty


  • Slow charging with solar power
  • No headphone jack
  • Manual tuning buttons not user-friendly

The FosPower 4000mAh Emergency Radio is a reliable and versatile travel accessory that provides power, light, and access to emergency weather broadcasts. With its multiple power sources and compact design, it is perfect for outdoor adventures and emergency situations. The SOS alarm function and bright flashlight ensure that you can call for help and navigate in the dark. While it may have some minor drawbacks like slow solar charging and lack of a headphone jack, the overall performance and quality of this emergency radio are impressive. It is a must-have for travelers and outdoor enthusiasts who prioritize safety and preparedness.

Overall Score: 8.2/10

The ROMOSS 40000mAh Power Bank is a must-have traveling accessory for anyone in need of a reliable and powerful portable charger. With its huge capacity of 40000mAh, it can support up to 8 times recharge for an iPhone 11 or 8.2 times recharge for a Samsung S10. The long-lasting power bank holds the charge for weeks, making it perfect for trips, music festivals, hiking, and more. It features an 18W PD 3-output and 2-input, allowing you to charge QC-support devices up to 80% in just 35 minutes. With the pass-through supported feature, you can even charge your devices while the power bank itself is being charged. It is compatible with devices that can be charged through USB ports, making it versatile for various devices. The power bank is available in black and has dimensions of 6.67Lx3.21Wx1.73H. Overall, this power bank offers convenience, high-capacity charging, and fast charging capabilities.

Key Features

  • Precise Power Display: Always know how much capacity left
  • Huge Capacity: Supports up to 8 times recharge for i Phone 11
  • 18W MAX PD 3-Output & 2-Input: Charges QC-support devices quickly
  • Pass-Through Supported: Charge devices while being charged
  • 2-input: Micro-USB and Type-C for convenient recharging


  • Color: Black
  • Dimension: 6.67Lx3.21Wx1.73H
  • Size: 18w


  • High capacity and long-lasting charge
  • Fast charging capabilities
  • Supports charging multiple devices simultaneously
  • Pass-through charging feature
  • Convenient recharging options


  • Heavy and bulky
  • USB-C port may become faulty after prolonged use

The ROMOSS 40000mAh Power Bank is an excellent choice for travelers who need a reliable and high-capacity portable charger. With its 40000mAh capacity, it provides multiple recharges for various devices and can hold the charge for weeks. The fast charging capabilities and ability to charge multiple devices simultaneously make it incredibly convenient. However, it is important to note that the power bank is heavy and bulky, which may be a drawback for some users. Additionally, the USB-C port might experience issues after long-term use. Overall, the ROMOSS 40000mAh Power Bank offers great value for its price and is a reliable companion for travelers in need of a portable charging solution.

Overall Score: 9/10

The FosPower 4000mAh NOAA Emergency Weather Radio is a portable and versatile device that is essential for both home and outdoor use. With AM, FM, and pre-programmed NOAA weather channels, it provides news, entertainment, and weather broadcasts. The radio also functions as a power bank, with a 4000mAh high-capacity internal battery that supports radio listening for up to 20 hours and can charge phones or small electronic devices. It features a bright and energy-efficient LED flashlight, an SOS function for emergencies, and multiple power solutions including hand-crank and solar charging. The radio is backed by a limited lifetime warranty and offers a compact and reliable option for staying informed and prepared during emergencies.

Key Features

  • Portable weather radio with AM, FM, and pre-programmed NOAA weather channels
  • 4000m Ah high-capacity power bank for emergency phone charging
  • LED flashlight and SOS function for emergencies
  • Multiple power solutions including hand-crank and solar charging
  • Limited lifetime warranty for customer satisfaction


  • Color: Black
  • Dimension: 7.76Lx3.54Wx3.15H


  • Versatile and compact design
  • Reliable reception and sound quality
  • Various charging options for convenience
  • Bright LED flashlight for emergencies
  • Limited lifetime warranty for peace of mind


  • Buttons and LED lights are small and may be difficult to see in the dark
  • Crack on plastic screen may affect appearance
  • Limited reception for some weaker FM stations
  • Lack of manual and storage space for cables

The FosPower 4000mAh NOAA Emergency Weather Radio is a reliable and portable companion for any outdoor enthusiast or emergency preparedness kit. With its multiple charging options, bright flashlight, and versatile radio functions, it offers peace of mind and essential communication capabilities during unexpected situations. The limited lifetime warranty is a testament to the product’s quality and durability. However, users should be aware of the small buttons and LED lights that may be challenging to use in low-light conditions. Overall, this radio is a worthwhile investment for staying informed and connected in emergencies.

Overall Score: 7.5/10

The Multifunctional Bike LED Headlight is a versatile accessory that combines multiple functions into one product. With a bike front highlight, mobile phone bracket, high decibel horn, power bank, and solar charger, this accessory eliminates the need for multiple equipment. The bike LED light offers three lighting modes and a built-in 130DB bike bell for added safety during cycling. The universal phone bracket fits phones up to 6.3 inches, making it compatible with various smartphone models. The headlight is rechargeable via USB and can also be charged by solar power. It is easy to install and suitable for various vehicles. Despite some limitations reported by users, this accessory has received positive reviews for its brightness, convenience, and functionality.

Key Features

  • Multifunctional with 5 functions
  • Bike front Highlight & Horn
  • Universal Bike Phone Bracket
  • USB Rechargeable & Solar Power Bank
  • Easy Installation & Widely Used


  • Dimension: 6.90Lx4.00Wx2.40H


  • Multiple functions in one product
  • Bright bike LED light with three modes
  • Universal phone bracket fits various phone models
  • USB rechargeable and solar power bank
  • Convenient and easy to install


  • Limited waterproofing
  • Security issues with latch and phone stability
  • Not ideal for motorized bicycles
  • Horn sound quality not optimal

The Multifunctional Bike LED Headlight is a handy accessory for cyclists looking for a versatile and convenient solution. With its multifunctional design, including a bike light, horn, phone bracket, and power bank, this product offers great value for money. It provides decent brightness and three lighting modes for different cycling conditions. However, some users have reported issues with waterproofing and durability of the mounting mechanism. Despite these limitations, the versatile features and ease of installation make it a worthy option for most cyclists. If you’re searching for a reliable and multifunctional bike accessory, this product is worth considering.

Overall Score: 8.7/10

The Solar camping lights, also known as camping lantern, are a multi-functional accessory that is perfect for outdoor activities such as camping, hiking, and emergency situations. These lights can be charged using solar power or through a USB-Type-C connection, making them versatile and convenient for use both outdoors and indoors. With a high brightness of 1200 lumens and a rotating design, these lights provide a wide field of view lighting effect. The built-in 4000 mAh lithium battery can be used as an emergency power source to charge your electronics while outdoors, and it has a long usage time of over 12 hours. The light has 5 different light modes, including flashing and SOS, and it is waterproof and suspendable, making it suitable for any harsh weather conditions. Equipped with power indicators and offering excellent after-sales service, these solar camping lights are a reliable and practical accessory for any traveler.

Key Features

  • Solar + USB Charging for versatile use
  • 4000m Ah Power Bank for emergency charging
  • 5 Light Modes & SOS Mode for different needs
  • IPX65 Waterproof for use in harsh weather
  • Suspendable design for larger lighting area
  • Power Indicator for battery status
  • After-Sales Service for customer support


  • Color: Black


  • Versatile and convenient for outdoor and indoor use
  • High brightness and wide field of view
  • Long usage time and emergency charging capability
  • Multiple light modes for various situations
  • Waterproof and suspendable design for harsh weather
  • Power indicator and after-sales service for customer support


  • Solar charging may be slow in certain conditions
  • Inadequate solar panel for frequent use without plugging in

The Solar camping lights are a reliable and practical accessory for travelers who enjoy outdoor activities. With their versatile charging options, high brightness, and long usage time, these lights provide convenience and reliability in any situation. The multiple light modes and waterproof design make them suitable for various weather conditions, while the suspendable design ensures a larger lighting area. The power indicator and after-sales service add to the overall user experience. While the solar charging may be slower compared to other methods, these lights still offer a great solution for emergency power and lighting needs. Overall, the Solar camping lights are a must-have accessory for any traveler looking to enhance their outdoor experience.

Buyer's Guide: 4000mAh Power Bank

Congratulations on considering purchasing a 4000mAh power bank! These portable chargers have become an essential accessory for our tech-savvy lives. To help you make the best decision, here is a comprehensive buyer's guide:

What to Look for in a 4000mAh Power Bank:

  1. Capacity: The 4000mAh capacity is the maximum power that the power bank can store. Consider your usage patterns and the number of devices you need to charge to determine if 4000mAh is sufficient for your needs.
  2. Size and Weight: Portability is a crucial factor for a power bank. Look for compact and lightweight options, so it's easy to carry in your pocket, bag, or purse without adding much bulk.
  3. Charging Ports: Check the number of charging ports available. Some power banks come with multiple ports, allowing you to charge several devices simultaneously. Ensure compatibility with your devices' charging cables as well.
  4. Charging Speed: Consider the input and output charging speed of the power bank. Higher input speed means it charges faster, while higher output speed ensures quick charging for your devices. Note that the actual charging time may vary based on your device's specifications.
  5. Safety Features: Look for safety features like over-charge protection, short-circuit protection, and temperature control. These safeguards ensure your devices are protected from any potential risks that may be associated with charging.
  6. Indicators and Controls: Some power banks come with LED lights or displays to indicate the remaining battery level. This feature can be handy in determining when you need to recharge the power bank.
  7. Brand Reputation and Reviews: Research the reputation of different power bank brands and read customer reviews. This will provide insights into the product's durability, performance, and customer satisfaction.
  8. Accessories and Additional Features: Some power banks may include additional features like built-in cables, flashlights, or wireless charging capabilities. Assess if these features align with your preferences and needs.

Frequently Asked Questions about 8 Best 4000 Mah Power Bank for 2023

Can a 4000mAh power bank charge my phone multiple times?

The number of times a power bank can charge your phone depends on factors like your phone’s battery capacity and power bank efficiency. A 4000mAh power bank can typically charge a smartphone with a 3000mAh battery fully once, but it may not provide multiple full charges.

How long does it take to recharge a 4000mAh power bank?

The recharging time depends on the power bank’s input charging speed and the power source you are using. On average, it may take around 4-6 hours to recharge a 4000mAh power bank fully.

Can I use a 4000mAh power bank to charge other devices like tablets or Bluetooth speakers?

Yes, a 4000mAh power bank can charge other devices like tablets or speakers. However, keep in mind that these devices usually have larger batteries, so the power bank may not be able to provide a full charge.

Can a 4000mAh power bank damage my devices?

If the power bank has necessary safety features like over-charge protection and short-circuit protection, it should not damage your devices. However, it is essential to use reputable brands and avoid substandard products.

How do I know when the power bank is fully charged?

Most power banks feature LED lights or displays to indicate the charging status. Typically, when all the LED lights are solid or the display shows a full battery icon, it indicates that the power bank is fully charged.

Is it better to have one port or multiple charging ports on a power bank?

Having multiple charging ports can be advantageous if you have multiple devices to charge simultaneously. It saves time and allows you to charge multiple devices at once. However, if you only need to charge one device at a time, a single port power bank will suffice.

Is a 4000mAh power bank allowed on flights?

Most airlines allow power banks with a capacity below 100Wh (Watt-hours) in carry-on baggage. Since a 4000mAh power bank is below this limit, you should be able to bring it onboard. However, regulations may vary, so it’s always good to check with your specific airline.

Are there any warranty options available for 4000mAh power banks?

Yes, many power banks come with warranties varying from 6 months to a year. Always check the warranty terms and conditions specific to the brand and model you choose.

Can I charge the power bank while it's charging my device?

It is generally not recommended to charge the power bank while it is charging your device. The power bank’s charging efficiency may decrease, causing slower charging for your device. It is better to charge the power bank and then use it to charge your devices separately.

Can a 4000mAh power bank be used to jump-start a car?

No, a 4000mAh power bank is not designed to jump-start a car. These power banks are intended for charging small electronic devices such as smartphones, tablets, and Bluetooth speakers.