9 Best 21700 Battery For 2024

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Introducing the 9 Best 21700 Battery for 2023! As technology continues to advance, the demand for high-performance batteries to power our devices has never been greater. Whether you're an avid gamer, a tech enthusiast, or simply someone who relies on their gadgets daily, having a reliable and long-lasting battery is crucial. In this article, we will explore the top nine 21700 batteries available in 2023, highlighting their features, capabilities, and overall performance. Stay tuned to discover which batteries are leading the pack when it comes to powering your devices efficiently and effectively.


The CPZZ 21700 Battery is a high-quality rechargeable battery designed for use in led flashlights and electronic devices. With a capacity of 5000mah and a voltage of 3.7 volts, this battery offers excellent performance and reliability. Its compact size of 21*21*71 mm (0.82*0.82*2.79 inches) makes it convenient for various applications. Whether you need to power up your flashlight or electronic device, this battery is a great choice. It comes in a pack of two, ensuring you always have a backup ready. The CPZZ 21700 Battery is suitable for a wide range of applications and provides long-lasting power.

Key Features

  • Wide range of applications: 3.7V 21700 Battery
  • Product Size: 2121*71 mm (0.82*0.822.79 inches)
  • 2-pack of rechargeable batteries
  • Specifications

  • Size: 2 pack
  • Pros

  • High capacity of 5000mah
  • Reliable performance
  • Compact and convenient size
  • Suitable for various applications
  • Cons


    The CPZZ 21700 Battery offers excellent performance and reliability for powering led flashlights and electronic devices. With its high capacity and compact size, it is a great choice for users who need long-lasting power. The wide range of applications makes it versatile and suitable for different devices and scenarios. The 2-pack ensures you always have a backup battery on hand. Whether you’re going camping, working on DIY projects, or just need a reliable power source, the CPZZ 21700 Battery is a solid option.


    The IMREN 3.7V Button Top Battery is a powerful and rechargeable battery that is perfect for various devices such as flashlights, headlamps, doorbells, and RC cars. With a capacity of 4500mAh, this battery is designed to provide long-lasting power. It features a built-in micro-USB port for easy charging with the included 2-in-1 USB-C cable, eliminating the need for an additional battery charger. The LED indicator light shows the charging status, turning from red to blue when the battery is fully charged. This battery has a low self-discharge rate and no memory effect, ensuring optimal performance even after repeated charging and discharging. Please note that this battery is 2mm longer than a standard 21700 cell, so make sure to check the size before purchasing.

    Key Features

  • Battery size: 21mm x 75mm; Capacity: 4500m Ah
  • Built-in micro-USB port for easy charging
  • Compatible with Fenix USB-C rechargeable LED series flashlights
  • Low self-discharge and no memory effect
  • Includes 2-in-1 USB-C cable for charging
  • Specifications

  • Dimension: 0.00Lx0.00Wx0.00H
  • Size: Longer than standard 21700 cell
  • Pros

  • Large capacity of 4500m Ah
  • Built-in micro-USB port for easy charging
  • No memory effect, prolonging battery life
  • LED indicator for charging status
  • Includes 2-in-1 USB-C cable for charging
  • Cons

  • Battery is 2mm longer than standard 21700 cell

    The IMREN 3.7V Button Top Battery is a reliable and convenient power source for various devices. With its high capacity and built-in micro-USB port, it offers easy and efficient charging. The low self-discharge rate and lack of memory effect ensure long-lasting performance. The only drawback is its slightly longer size compared to standard 21700 cells. Overall, this battery is a great choice for anyone in need of a powerful and rechargeable option.


    The 21750 21700 Battery Charger is a versatile and intelligent charger designed to support various battery types. It features a long slot that can accommodate batteries up to 75mm in length, making it suitable for 21750, 21700, 20700, and other rechargeable batteries. The charger is also compatible with a wide range of battery chemistries, including Ni-MH, Ni-CD, Li-ion, and more. With its intelligent design, users can easily monitor the charging status and adjust the charging current according to their needs. Safety is also a top priority, as the charger is equipped with multiple protection settings to prevent damage to batteries. Overall, this charger offers convenience, compatibility, and safety for all your battery charging needs.

    Key Features

  • Long Slot to support various battery sizes
  • Universal Compatibility with multiple battery types
  • Intelligent Design for easy monitoring and control
  • Safety Assurance with multiple protection settings
  • Specifications

  • Dimension: 1.18Lx2.36Wx4.84H
  • Pros

  • Compatible with a wide range of battery types
  • Intelligent design allows for easy monitoring and control
  • Multiple protection settings for safety assurance
  • Cons

  • Charging speed may be slow
  • Spring holders may not be strong enough for larger batteries

    The 21750 21700 Battery Charger is an excellent choice for anyone in need of a reliable and versatile charger. It supports a wide range of battery types, offers intelligent monitoring and control features, and ensures safety with its multiple protection settings. While it may have some minor drawbacks in terms of charging speed and spring holder strength, its overall performance and compatibility make it a worthwhile investment. Whether you need to charge your flashlight batteries or other rechargeable devices, this charger will meet your needs efficiently and effectively.


    The 18650 to 21700 Battery Adapter offers greater flexibility and convenience for users who want to utilize their existing supply of 18650 batteries without having to buy new 21700 batteries. With this adapter, users can enjoy the same performance and reliability of specialized batteries by simply inserting their 18650 battery. This not only saves both money and time but also reduces environmental impact. The adapter features highly conductive copper-plated gold battery contacts and is made of fire retardant ABS material. It comes with a 5-year warranty and replacement guarantee, ensuring excellent after-sales service. Please note that the weight of this battery adapter is about 0.25 ounces.

    Key Features

  • Flexible adapter for utilizing existing 18650 batteries
  • Saves money by avoiding the need to buy new 21700 batteries
  • Fire retardant ABS material with copper-plated gold contacts
  • Comes with a 5-year warranty and replacement guarantee
  • Specifications

  • Color: 2 Battery Converters
  • Pros

  • Provides flexibility and convenience
  • Saves money and reduces waste
  • High-quality material and construction
  • 5-year warranty and replacement guarantee
  • Cons

  • Arrived broken for some customers

    The 18650 to 21700 Battery Adapter is a practical solution for users who want to maximize their existing supply of 18650 batteries. It offers flexibility, convenience, and cost-saving benefits by providing the same level of performance and reliability as specialized batteries. The adapter’s high-quality construction and fire retardant ABS material ensure safety, while the copper-plated gold battery contacts offer excellent conductivity. With a 5-year warranty and replacement guarantee, customers can trust in the product’s durability and reliability. However, some customers have reported receiving broken adapters, so extra care should be taken when handling and shipping. Overall, this adapter is a smart investment for anyone looking to make the most of their 18650 batteries without the need for additional purchases.


    The CWUU 21700 Battery is a reliable and long-lasting rechargeable lithium-ion cell. With a capacity of 5000mAh, it provides a stable power source and multiple protections including temperature, short circuit, overcharge, and overcurrent protection. This battery is small, lightweight, and portable, making it ideal for various applications such as flashlights, headlights, doorbells, garden lights, and solar lights. Whether you need a reliable power source for your outdoor adventures, emergencies, or everyday use, the CWUU 21700 Battery is an excellent choice.

    Key Features

  • Multiple protections
  • Long-lasting and rechargeable
  • Applicable for various devices
  • Specifications

  • Size: 1 Count (Pack of 2)
  • Pros

  • Provides multiple protections for safety
  • Durable and high-quality materials
  • Small size and light weight for portability
  • Suitable for emergencies and outdoor activities
  • Cons

  • Does not come with a charge cord as shown in the picture
  • May not fully charge in existing outside deck lights

    The CWUU 21700 Battery offers excellent performance with its long-lasting and rechargeable design. Its multiple protections ensure safety during use, and its small size makes it convenient to carry. Whether you need a power source for your flashlights, headlights, or other devices, this battery is a reliable choice. The only drawback is the absence of a charge cord, which may require an additional purchase. Additionally, it may not fully charge in certain light fixtures. However, considering its overall performance and durability, the CWUU 21700 Battery is a great option for those seeking a dependable and portable power solution.


    The COSHIP 21700 Battery is a high-performance rechargeable battery perfect for strong light flashlights and other electronic devices. With a capacity of 5000mAh, these batteries offer long-lasting power and support a stable 3.7-volt output voltage. They are designed to be safe to use, with integrated safety circuits that protect against overcharging, over-discharging, short-circuiting, and overheating. These versatile batteries can be used in a wide range of devices, including LED flashlights, emergency lights, portable devices, headlights, toys, and more. If you have any questions or concerns, the COSHIP team is dedicated to providing excellent customer service and resolving any issues. Get the COSHIP 21700 Battery for reliable power and peace of mind.

    Key Features

  • 21700 Rechargeable Battery
  • High Performance
  • Safety Assurance
  • Wide Application
  • Warm Service
  • Specifications

  • Color: 21700-Black
  • Size: 1 Count (Pack of 4)
  • Pros

  • High capacity of 5000m Ah
  • No memory effect
  • Integrated safety circuit for protection
  • Versatile and compatible with various devices
  • Dedicated customer service
  • Cons

  • Battery size must be confirmed before purchase

    The COSHIP 21700 Battery is a reliable and high-performance rechargeable battery suitable for a wide range of electronic devices. With its 5000mAh capacity, stable output voltage, and built-in safety features, this battery offers long-lasting power and peace of mind. Whether you need it for a flashlight, emergency light, portable device, or toy, the COSHIP 21700 Battery will deliver. The warm service provided by the COSHIP team ensures that any concerns or questions are promptly addressed. However, it is important to confirm the battery size before purchasing. Overall, this pack of 4 batteries is a great investment for anyone seeking a dependable power source.


    The WBwissblue i2 18650 21700 Battery Charger Set is a universal smart charger that is compatible with a wide range of batteries, including 18650, 21700, 26650, and 1.2V AA AAA batteries. It features an LCD screen that provides detailed information about the charging process, such as charging time, charge capacity, battery voltage, and charging progress. The charger also offers adjustable charging speed and a unique discharge function to reduce battery damage. With its compact and portable design, it is an ideal travel charger. The charger has received positive reviews for its value, compactness, and convenience. However, there are some complaints about the durability of the LEDs. Overall, it is a reliable and versatile battery charger.

    Key Features

  • Wide compatibility with various battery types
  • LCD screen for detailed charging information
  • Safe and adjustable charging speed
  • Portable and compact design
  • Specifications


  • Wide compatibility with different battery types
  • Detailed charging information on LCD screen
  • Adjustable charging speed for convenience
  • Portable and compact design for travel
  • Cons

  • Durability issue with the LEDs

    The WBwissblue i2 18650 21700 Battery Charger Set is a reliable and versatile charger that offers wide compatibility and adjustable charging speed. Its LCD screen provides detailed information about the charging process, and its portable design makes it a convenient travel companion. While there are some concerns about the durability of the LEDs, overall it is considered a good value for its price. If you are looking for a budget-friendly charger with multiple battery compatibility, the WBwissblue i2 is worth considering.


    The Fenix are-A2 Smart Battery Charger is a versatile and efficient device that allows you to charge 1 or 2 batteries simultaneously. It is compatible with a wide range of batteries, including 10440, 14500, 16340, 18650, 21700, 26650, and Ni-MH/NiCd AA, AAA, and C. With multiple levels of protection, such as short-circuit protection, over-current protection, over-voltage protection, and reverse polarity protection, you can safely charge your batteries without any worries. The charger features an LCD screen display that provides clear details and status updates. Additionally, the bundle includes an EdisonBright BBX5 battery carry case for added convenience and portability.

    Key Features

  • Charge 1 or 2 batteries at the same time
  • Compatible with various battery types
  • Multiple levels of protection
  • LCD screen display
  • Includes Edison Bright BBX5 battery carry case
  • Specifications

  • Color: Black
  • Dimension: 5.87Lx2.95Wx1.59H
  • Pros

  • Affordable and great value for the price
  • Charges batteries efficiently and effectively
  • Clear and informative LCD screen display
  • Comes with a useful battery carry case
  • Cons

  • Does not charge type CR123R batteries
  • Some batteries with charging port may not fit
  • Charging speed for RCR123A batteries is slower
  • Packaging requires effort to open

    The Fenix are-A2 Smart Battery Charger is an excellent choice for anyone in need of a reliable and versatile charger. It offers the convenience of charging multiple batteries simultaneously and provides multiple levels of protection for safe charging. The LCD screen display is clear and informative, allowing you to monitor the charging progress easily. The bundle with the EdisonBright BBX5 battery carry case is a nice addition for portability. While there are a few minor drawbacks, such as the limitation in charging certain battery types and the packaging being a bit challenging to open, these issues do not outweigh the overall performance and value of this charger. It is a reliable and affordable option for anyone looking to keep their batteries charged and ready for use.


    The POWXS Universal Lithium 18650 Battery Charger is a high-speed charger that delivers a fast charge to your batteries. It features a micro-USB and Type-C dual input, allowing you to charge your batteries anytime and anywhere. The charger is compatible with various 1.2V Ni-MH C AA AAA batteries and 3.7V Li-ion batteries, making it a versatile option. It also offers multiple protection technologies to keep your batteries safe from overcharging and other potential risks. With its smart LCD display, you can easily monitor the charging process and identify any bad batteries. Overall, the POWXS Universal Lithium 18650 Battery Charger is a reliable and efficient charging solution for your devices.

    Key Features

  • High-speed charging
  • Micro-USB & Type-C dual input
  • Universal battery charger
  • Multi-protection
  • Smart LCD display
  • Specifications

  • Color: Black
  • Size: 4 Slots
  • Pros

  • High-speed charging for faster charge times
  • Dual input options for convenient charging anywhere
  • Compatible with various battery types
  • Multiple protection technologies for safety
  • Smart LCD display for easy monitoring
  • Cons

  • Some users reported compatibility issues with certain batteries

    The POWXS Universal Lithium 18650 Battery Charger is a reliable and efficient charging solution that offers high-speed charging, dual input options, and compatibility with various battery types. Its multiple protection technologies ensure the safety of your batteries, and the smart LCD display provides easy monitoring. Although there have been some reports of compatibility issues, overall, this charger offers great value for its price. Whether you need to charge your 3.7V Li-ion batteries or 1.2V Ni-MH C AA AAA batteries, the POWXS Universal Lithium 18650 Battery Charger is a trustworthy companion for your charging needs.


    21700 Battery Buyer's Guide


    The 21700 battery has gained significant popularity in recent years due to its larger capacity and improved performance compared to its predecessors. Whether you're a gadget enthusiast, a frequent traveler, or simply looking to power your devices more efficiently, the 21700 battery is a reliable option. In this buyer's guide, we'll explore the key factors to consider before purchasing a 21700 battery.

    Factors to Consider

    • Capacity: Check the battery's milliampere-hour (mAh) rating to determine its capacity. Higher numbers typically indicate extended usage before recharging.
    • Voltage: Ensure that the battery's voltage (V) matches the requirements of your device. Incorrect voltage may result in inadequate power supply or even damage your device.
    • Compatibility: Confirm whether the 21700 battery is compatible with your specific device. Some devices may have limitations or require specific battery sizes.
    • Rechargeable or Disposable: Decide if you prefer a rechargeable or disposable battery. Rechargeable batteries can be used multiple times and are more cost-effective in the long run. On the other hand, disposable batteries are convenient when access to charging is limited.
    • Brand Reputation: Consider reputable brands known for producing quality batteries. Reliable brands often prioritize safety and undergo rigorous testing to ensure their batteries meet industry standards.
    • Price: Compare prices among different brands and sellers to find a balance between affordability and quality. Be cautious of extremely low-priced batteries, as they may compromise on performance or safety.
    • Reviews and Ratings: Make use of online platforms and customer reviews to gather insights from previous buyers. Reviews can provide valuable information about a battery's performance, longevity, and safety features.
    • Safety Features: Look for safety features such as protection against overcharging, short circuits, overheating, and excessive discharge. Prioritizing safety ensures the longevity of both the battery and your device.
    • Warranty: Check if the battery includes a warranty or guarantee. Warranty coverage can offer peace of mind and protection against any defects or malfunctions.
    • Longevity: Consider the expected lifespan of the battery. Longer-lasting batteries are desirable, particularly if you rely heavily on your devices or have limited access to charging.


    Frequently Asked Questions

    Q: How is the 21700 battery different from other battery sizes?
    A: The 21700 battery is larger in size compared to its predecessors, such as the 18650 battery. Its increased capacity allows for more power storage, resulting in longer usage times for your devices.

    Q: Can I use a 21700 battery in devices that typically use other battery sizes?
    A: In most cases, 21700 batteries are intended for devices explicitly designed to accommodate this battery size. It’s essential to check your device’s compatibility before making a purchase.

    Q: Are 21700 batteries exclusive to a particular type of device?
    A: No, 21700 batteries are commonly used in various electronic devices, such as high-power flashlights, electric vehicles, laptops, and other portable gadgets that require increased power capacity.

    Q: Are there any safety concerns with using 21700 batteries?
    A: While 21700 batteries are generally safe when used correctly, it’s crucial to handle them with care. Avoid exposing batteries to extreme temperatures, never use damaged batteries, and always charge them with approved chargers.

    Q: How long does a fully charged 21700 battery last?
    A: The battery life of a fully charged 21700 battery depends on multiple factors, including the device’s power consumption, battery capacity, and usage patterns. Higher-capacity batteries can generally provide longer usage times.

    Q: Are all 21700 batteries rechargeable?
    A: Yes, the majority of 21700 batteries available in the market are rechargeable. However, it’s essential to confirm the specifications of the battery you intend to purchase, as there may be exceptions.

    Q: Can I replace my device's original battery with a 21700 battery?
    A: It is not recommended to replace the original battery of your device with a 21700 battery unless the device specifically supports this battery size. Using incompatible batteries may lead to malfunction or damage.

    Q: Can I travel with 21700 batteries?
    A: Yes, you can travel with 21700 batteries. However, it is important to check the airline and transportation regulations regarding battery transportation, as they may have specific guidelines for carrying batteries.

    Q: How do I properly dispose of a 21700 battery?
    A: It is crucial to recycle or dispose of 21700 batteries safely. Many electronic stores or recycling centers accept used batteries for proper recycling. Check your local guidelines to ensure environmentally friendly disposal.

    Q: Where can I purchase 21700 batteries?
    A: 21700 batteries are widely available and can be purchased from various online retailers, electronics stores, or specialized battery retailers.