Best 21700 Battery Chargers From XTAR

May 16, 2023 | XTAR

Having the right battery charger for your electronic devices is crucial to ensure they function effectively. With so many different types and brands of battery chargers available, it can be overwhelming to choose the right one. In this guide, we’ll focus on the best 21700 battery chargers from XTAR, a leading manufacturer of high-quality charging solutions. We’ll go through the top products, their features, and what to consider when choosing a 21700 battery charger.

Top 6 Best 21700 Battery Chargers from XTAR

As one of the leading names in battery charging technology, XTAR offers a range of top-quality chargers designed to meet the needs of every type of user. In this section, we’ll introduce you to the top 6 best 21700 battery chargers from XTAR. Whether you’re a casual user, an outdoor enthusiast, a tech-savvy user, a traveler, a professional user, or an enthusiast, we’ve got you covered.

XTAR VC4SL Charger | Universal Battery Charger

The VC4SL is a universal charger that is perfect for casual users who require a reliable charger for their 21700 batteries. It has four battery slots and can charge batteries with a USB Type-C input. You don’t need to carry multiple types of cables when you’re on the go.

It also allows manual current selection, so you can choose between quick charging or prolonging your battery life. With a maximum charging current of 3A, you can quickly charge your batteries when you’re in a hurry, while the smallest 0.25A current is suitable for those who want to extend their battery life.

One of the most significant advantages of this charger is its ability to accept protected 21700 batteries, which is not available in many other brand chargers. Additionally, this charger has advanced features such as grading mode, which tests the real capacity of your batteries and helps you understand their performance. The storage mode adjusts your batteries to the best voltage level when you’re storing them for extended periods, which can prolong your battery life.

Finally, the reviving function brings your dead battery back to life, which is both eco-friendly and cost-effective.

Its key features include:

• USB-C input for faster charging

• Automatic charging mode and manual current selection

• Wide battery compatibility, LCD screen display

• Advanced battery capacity test and storage voltage adjusting function

• 0V activation function and multiple safety protections

XTAR VC2SL Charger | Dual Bay Travel Charger

The VC2SL is a compact and easy-to-use 2-bay charger that is well suited for travelers. Building upon the features of its predecessor VC2S, the VC2SL introduces a USB Type-C input port, providing greater convenience and compatibility.

This versatile charger is capable of charging a wide range of batteries, including 3.6/3.7V Li-ion and 1.2V Ni-MH batteries, ensuring that it meets your diverse charging needs. Notably, the VC2SL has the ability to charge protected 21700 batteries, accommodating the growing popularity of these batteries in the market.

With multiple charging current options available, including 1x2A, 2x1A, and 2×0.5A, the VC2SL will intelligently choose the optimal charging speed for your batteries. Furthermore, the VC2SL features a battery internal resistance test, allowing you to assess the condition of your batteries with ease.

Beyond its charging capabilities, the XTAR VC2SL offers an added convenience as a portable power bank. This means you can utilize its power bank function to charge your devices on the go, providing a reliable power source when you need it most.

Safety is a top priority with the VC2SL charger, as it incorporates multiple protection mechanisms to ensure safe and reliable charging. With safeguards against overcharging, overcurrent, overvoltage, overheating, and more, you can have peace of mind knowing that your batteries are in good hands.

Whether you’re at home or on the move, this charger is the perfect companion for keeping your batteries powered up and ready to go.

Its key features include:

• 2-bay charger: Simultaneously charge two batteries

• USB-C input and LCD screen display

• Battery internal resistance test

• USB output function

• Wide compatibility and safety protection

• 0V activation function to revive over-discharged batteries

• Automatic cutoff when charging is complete

XTAR X4 Extended Charger | Dual Input Versatile Charger

The XTAR X4 Extended charger is a versatile and high-performance charging solution designed to meet the diverse needs of battery enthusiasts. This advanced charger boasts exceptional compatibility, supporting a wide range of batteries including Li-ion (14500-26650), Ni-MH, and Ni-CD. It even handles protected 20700 and 21700 batteries.

Equipped with both an AC input port and a Micro USB input port, the X4 Extended Charger offers versatile charging options. The AC input provides faster charging with a 2A for two bays. The Micro USB input offers flexibility for on-the-go charging. Monitor the charging process easily with the X4 Extended Charger’s intuitive dial-LCD screen.

This charger serves as an emergency power supply with its 5V 1A USB output.

Safety and battery health are paramount in the X4 Extended Charger’s design. It incorporates a TC-CC-CV charging process, a 0V activation function for over-discharged batteries, and multiple protection mechanisms against overcharging, overheating, and short circuits. It also excels in heat dissipation, ensuring optimal performance and a longer lifespan.

Its key features include:

• Dual Input Ports: With both an AC and a Micro USB input port.

• Wide Compatibility, including protected 20700 and 21700 batteries

• Intelligent Current Selection (max 2 x 2A) to optimize charging speed and extend battery life.

• Emergency Power Supply: The charger features a 5V 1A USB output

• LCD display for real-time monitoring

XTAR VC8S Charger | All 8-Slot Battery Charger

The XTAR VC8S charger is a powerful battery charger designed for enthusiasts who need to charge or test multiple batteries simultaneously.

The VC8S features a USB-C powered input, with PD3.0 fast charging up to 3A x 2. This allows for efficient and speedy charging of up to 8 batteries (1A x 8) at once, making it an ideal choice for power users and professionals.

The charger also features a grading mode, which enables you to test the real capacity of your batteries. Additionally, the store mode helps maximize your batteries’ lifespan by adjusting their optimal storage voltage.

The VC8S allows you to manually control the charging current at 3A/2A/1A/0.5A/0.25A. This makes it a versatile option for all your charging needs.

The charger also features a LCD screen that displays real-time charging status, making it easy to monitor the charging process.

Finally, the VC8S features a TC-CC-CV 3-stage charging method for Li-ion batteries and unique CVSA tech for NiMH batteries. These technologies contribute to faster charging and higher accuracy of fully charged, effectively preventing overcharging and protecting your batteries.

It also includes a built-in multiple protection functions, ensuring the charging process is stable and safe.

Its key features include:

• Real capacity test, distinguishes overrated batteries

• Storage voltage adjusting, maximizes battery life

• Internal resistance test, easy to know battery health

• Charging 8 x 21700 batteries simultaneously

• Manuallycharging current selection

• Intelligent charging and multiple protection

XTAR PB2SL Charger | 21700 Power Bank

The PB2SL is a portable and durable charger that is ideal for outdoor enthusiasts and tech-savvy individuals. It is not just a charger but also a power bank.

Equipped with QC3.0 and PD3.0 dual-protocol fast charging, the PB2SL supports rapid charging with a maximum output of 2A x 2. It is compatible with all sizes of 18650, 18700, 20700, and 21700 batteries, including protected 20700/21700 batteries.

Featuring an informative display, the PB2SL shows real-time charging/discharging current and voltage, as well as battery capacity percentage. This enables you to monitor the charging process and keep track of the remaining battery power accurately.

With both USB-C and USB-A ports, the PB2SL allows for simultaneous output and charging of two external devices. This convenience is particularly useful for outdoor activities where multiple devices need to be powered up simultaneously.

Thanks to its patented battery charging and discharging balancing technology, the PB2SL maximizes the capacity of each battery and prolongs their lifespan.

Additionally, the PB2SL is designed with a magnetic cover, providing dust-proof and drop-proof protection for your batteries. The built-in ribbon makes it easy to remove the batteries. What’s more, a removable locking spacer is available for flat-top 20700 and 21700 batteries, while the rotating plastic piece can better hold your 18650 batteries in place.

Safety is a priority with the PB2SL, as it features intelligent charging and multiple protection mechanisms. With its high precision of full-charge detection, the PB2SL automatically stops charging when the batteries are fully charged, preventing overcharging and preserving the battery’s health.

Whether you’re traveling, camping, or simply on the go, the PB2SL ensures reliable and fast charging for your batteries and devices.

Its key features include:

• Portable battery charger and power bank

• Lightweight and compact, DIY the capacity as your will

• Dual port output, QC3.0 and PD 3.0 fast charging

• Compatible with all size of18650- 21700 batteries

• Battery level indicator

• Multiple protection mechanisms for safety

XTAR VP4L PLUS Charger | Personal Battery Doctor

The VP4L PLUS is not just a charger but also comprehensive battery management system that is perfect for enthusiasts who want to keep their batteries in top condition.

As a smart charger, it offers multiple charging options, including optional charge currents of 0.5A, 1.0A, and 2.0A, catering to various Li-ion and Ni-MH batteries, as well as 11.1V battery packs.

Equipped with a power-path management system, the VP4L PLUS enables simultaneous charging of batteries, battery packs, and external 5V USB devices directly from the adapter. While the USB output function delivers a maximum current of 2.4A for convenient power supply on the go. The built-in accurate cut-off mechanisms and efficient charging techniques prevent overcharging and prolong battery lifespan.

As a battery analyzer, it precisely measures battery internal resistance and voltage, functioning as a multi-meter to provide valuable insights into battery health and performance. The charger’s ability to test the real capacity of batteries allows users to accurately assess their power output and compare the performance of different batteries. Furthermore, the VP4L PLUS features a REFRESH mode specifically designed to eliminate memory effects in Ni-MH batteries, optimizing their overall performance and longevity.

Equipped with an informative big LCD screen display, the VP4L PLUS provides real-time monitoring of the charging process, ensuring users have full visibility and control. Additionally, the charger offers a record function, allowing users to check and compare the capacity test records of their batteries, facilitating better battery management. With a focus on safety and efficiency, the VP4L PLUS incorporates elaborate heat dissipation mechanisms to ensure reliable and stable charging.

It also features a low voltage activation, capable of reviving over-discharged batteries.

Its key features include:

• Analyzer & tester for 3.6/3.7V Li-ion & Ni-MH batteries, much higher accuracy than other similar chargers

• Battery voltage and resistance test like a multimeter

• Real capacity test like a small grading machine

• Adjustable charging currents

• REFRESH mode for Ni-MH batteries

• Power-Path management and USB output

• Low voltage activation

Specifications for the Top 6 XTAR 21700 Battery Chargers

Here is a table for the above top 6 XTAR 21700 battery chargers. It allows for a clearer comparison of the features and specifications of each 21700 charger.

Modes VC4SL VC2SL X4 Extended VC8S PB2SL VP4L PLUS
Input Ports USB Type-C USB Type-C Micro USB, AC USB Type-C USB Type-C DC 12V 3A
Output Ports / USB Type-A USB Type-A / USB Type-C & USB Type-A USB Type-A
Compatible Batteries 3.6V/3.7V Li-ion, 1.2V NiMH 3.6V/3.7V Li-ion, 1.2V NiMH 3.6V/3.7V Li-ion, 1.2V NiMH 3.6V/3.7V Li-ion, 1.2V NiMH 18650, 18700, 20700, 21700 3.6V/3.7V Li-ion, 1.2V NiMH, 11.1V Battery pack
Battery Channel 4 Bays 2 Bays 4 Bays 8 Bays 2 Bays 4 Bays
Charging Currents 0.25A – 3A 0.5A – 2A 0.5A, 1A, 2A 0.25A, 0.5A, 1A, 2A,3A, Max 2A 0.5A, 1A, 2A
LCD Display Yes Yes Yes Yes Yes Yes
Power Bank Function No Yes Yes No Yes Yes
Battery Analyzer Yes No No Yes No Yes
Additional Features Manual current selection  Internal resistance test Dual input ports, Low voltage activation Internal resitance test,
Capacity test,
Storage function,
Manual current selection
Power bank function Internal resitance test,
Capacity test,
Manual current selection, REFRESH mode

Things to Consider When Choosing a 21700 Battery Charger

A high-quality charger will keep your batteries performing at their best. Here are some things to consider when choosing a 21700 battery charger:

Charging Speed – The charging speed of the charger should match your needs and the capacity of your batteries. A quality intelligent charger would automatically select the optimal charging solution based on the battery status.

Compatibility – Some chargers are only designed to work with certain battery types or sizes, so it’s important to choose a charger that can handle the battery you have.

Number of Bays: The number of battery bays determines how many batteries you can charge at the same time. If you have multiple devices that require 21700 batteries, you may want to consider a charger with more bays to save time and energy.

Display and Controls: A charger with a clear display and user-friendly controls can make it easier to use and monitor the charging process. Some chargers offer advanced features such as real-time monitoring of battery voltage and capacity, which can help you better understand the health of your batteries.

Safety Issues – Look for a charger that offers protection against overcharging, over-discharging, and short-circuiting. Some chargers also have features like temperature monitoring and automatic shut-off to prevent damage to the battery or device.

Frequently Asked Questions & Answers

What amp should I charge my 21700 battery at?

The optimal charging current for a 21700 battery depends on its capacity. As a general guideline, it is recommended to charge a 21700 battery at a current between 0.5C and 1C. To calculate the proper charging current, multiply the battery’s capacity by the desired charging rate. For example, if you have a 4000mAh 21700 battery, a charging current of 2A (0.5C) would be suitable.

However, higher internal resistance may result in heat generation during charging, so it’s advisable to choose a slightly lower charging current if the battery is older or has higher resistance.

What are the best rechargeable batteries for 21700?

The suitability of a battery depends on your specific needs and preferences. To find the best battery for your requirements, it’s recommended to consider factors such as capacity, discharge rate, and overall performance. Remember, choosing high-quality batteries from reputable brands is crucial to ensure optimal performance and safety.

If you’re looking for the best 21700 batteries for flashlights, I invite you to check out my other article titled “Best 21700 Batteries for Flashlights.”

Can I charge 21700 batteries in an 18650 charger?

It is important to check the specifications and compatibility of your 18650 charger before attempting to charge 21700 batteries. While some 18650 chargers may be able to accommodate 21700 batteries, not all chargers are designed to support this larger battery size.

How do you charge a 21700 vape battery?

Charging a 21700 vape battery correctly is crucial for its longevity and safety. When it comes to high-drain 21700 batteries used in vape mods, it is recommended to consider using a high-quality intelligent charger that supports fast charging, as vapers often prefer a quick turnaround time for battery replenishment. Ensure that the charger you use has built-in safety features.

How long does it take to charge a 21700 battery?

The charging time of a 21700 battery can vary depending on the capacity of the battery, the charging current, and the charger being used. For example, if you use the XTAR VC4SL charger with a 21700 battery that has a capacity of 5000mAh and charge it at 3A, it would take around 1.5 to 2 hours to fully charge the battery.

It’s important to note that charging time can also depend on other factors such as the age and condition of the battery, as well as any internal resistance it may have.

Is it safe to leave 21700 batteries charging overnight?

Many smart battery chargers have the function of automatically cut-of after fully charged the battery, so you can leave your 21700 cells charging overnight. But it is not recommended to leave the fully charged batteries in the charger for a long time. Batteries would self-discharge, then the charger will automatically start to re-charge it.

How can I extend the lifespan of my 21700 batteries?

To maximize battery lifespan, avoid overcharging, over-discharging, and exposing the batteries to extreme temperatures. Use chargers that have safety features like overcharge protection and follow proper storage guidelines when not in use.


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