Are you searching for the best 4000mah 18650 battery? Confused with too many options? If that is your situation, you have come to the right place. This is your ultimate guide to buying the 4000mah 18650 battery.

We understand how much of a hassle it can be to go through thousands of reviews when you have too many options. So, leave all your worries, check out this ultimate guide, and make a hassle-free purchase decision.

10 Best 4000mah 18650 battery Reviews in 2021

Bestseller No. 1
Tokeyla 5 modes 18650 flashlight with two-slot charger and 6 -pack 18650 4000mAh button Top Rechargeable battery.
  • What you get: 1 x pack 18650 S30 flashlight with 1 x pack two-slot charger and 6 x pack 18650 4000mAh button top rechargeable battery.
  • Safe feature: Our 18650 lithium 3.7v rechargeable batteries are CE and RoHS certified with short circuit, over current and voltage surge protections.
  • Superior performance: Beats any weather never encounter a dead battery even during extreme weathers ranging from -40 °C to 85 °C/ -49 °F to 185 °F
  • Note: Button top rechargeable battery(not flat top, not AA or AAA battery, not fit mod/E-CI)
  • 4000mAh high capacity: Each 18650 lithium battery 3.7v rechargeable battery has a high capacity of 4000mAh, can power up your devices for long time
Bestseller No. 2
4000mAh 18650 Battery Pack BOS14.4B Li-ion Battery 14.4V Replacement for Bosch BAT607 BAT607G BAT614 BAT614G Battery Pack 14.4V
  • Brand and New|Battery Type:Li-ion| Voltage:14.4V|Capacity:4000mAh| Colo:Black&Red|NO FAKE HIGH-LABEL CAPACITY
  • Professional replacement battery for BOSCH DDB180-02,GDR1080-LI,GDR14.4V-LI,GDR14.4V-LIMF,GDR14.4V-LIN, GDR14.4V-LIMF,GDR1440-LI,GDS14.4V-LI,GDS14.4V-LIN,GHO14.4V-LI.etc Cordless Power Tool , Completely meets BOS OEM battery standards.
  • No memory effect and Can be charged or discharged as needed without loss of capacity.
  • High quality battery cells can increasing to use for longer running time.Products are FCC, RoHS and CE certified, tested by manufacturer to match OEM products,as good as even better than the originals.
  • We guarantee to provide safety and full capacity replacement batteries. We also offer you 100% risk-free satisfaction guarantee to let you buy with confidence; no questions asked. 30-day money back and a 12-month warranty.
Bestseller No. 3
WindFire New Super Bright Wf-501b Cree XML-L2 LED 1000 Lumens 1 Mode 3.7-18v Flashlight plus 2x WindFire 4000mAh 18650 Rechargeable Batteries and Smart AC Charger
  • CREE XML-L2 Ultra Bright 1000 Lumen LED flashlight.
  • Aluminum alloy casing for waterproof and shockproof design.
  • 1 switch mode, Easy to operate, One-Button-Operation.
  • Powr Source: work with 1 x 18650 Battery(Included) or 2x CR123 Batteries(NOT Included)
  • Perfect flashlight for outdoor activities like hiking, camping, hunting, and so on.
Bestseller No. 4
Cycle Ni-Mh Pre-Charged Rechargeable Batteriesndegdgswg 3.7V 18650 4000Mah 4400Mah 6000Mah Lithium Battery Pack Rechargeable Battery Megaphone Speaker Protection Board 4400Mah
  • Nominal capacity: 4000mah 4400mAh 6000mah
  • Product size: 19*37*66mm Voltage: 3.7 V
  • Standard weight: about 90g
  • recommended charge current: 2A
  • The battery pack is widely used in headlights, miner's lamp, flashlight, searchlight, loudspeaker (loudspeaker), wireless monitoring equipment, instrumentation, traffic signs, portable small appliances
Bestseller No. 5
WindFire New Wf-502b Cree Xm-l T6 LED 1000 Lumens 1 Mode Flashlight Torch plus 2x WindFire 4000mAh 18650 Rechargeable Batteries and Smart AC Charger for Camping, Hiking, Hunting & Indoor Activities.
  • CREE XML T6 1000 Lumen LED flashlight
  • Aluminum alloy casing with o-rings for waterproof and shockproof design.
  • 1 switch mode, Easy to operate, One-Button-Operation
  • Powr Source: work with 1 x 18650 Battery
  • Perfect flashlight for outdoor activities like hiking, camping, hunting, and so on.
Bestseller No. 6
RAYNAKS Total MAX Output Current 4000mAh RC217 Two Channel Speedy Battery Charger for 3.6V 3.7V 4.2V 21700 20700 18650 Circuit Protected Li-ion Rechargeable Batteries with Car Adaptor Code
  • Total Max Output Charging Current 4000mAh /One channel 4.2Volts 2000mAh ⅹ 2
  • Speedy Charging equally one independent battery or two batteries
  • Safety Protection/ Overcharging Prevention/ Overvoltage Prevention/ Overcurrent Prevention/ Reversed Polarity Prevention
  • Compatible with 3.6V 3.7V 4.2V 21700 20700 18650(19mmx69.5mm) Circuit protected Li-ion Batteries
  • Package Include 1x RC217 Battery Charger/ 1x 12V Adaptor/ 1x Car Adapter Code
Bestseller No. 7
LeKaufen 2000 High Lumen 18650 Handheld LED Flashlight Ultra Bright Torch with 8 PCS 18650 Rechargeable Batteries 4000mAh high capacity and charger Waterproof for Camping Hiking Outdoor Emergency
  • Super bright: high efficiency and high output (2000 lumens) LED chip. This is a super bright flashlight with a life span of more than 50,000 hours.
  • 【18650 battery 】: 8 bay 18650 rechargeable batteries,3.7V 4000 mAh rating lithium battery,high capacity,long lasting time,eco-friendly and recycle,over-voltage protection,short circuit protection,over-current protection,multi-purpose,suitable for vape,flash,mouse,flashlight, camera,toys,etc.
  • 【Fast charger】:2 slots charger,over-vurrent protection,over-voltage protection,short circuit protection,over-heat protection,protect your safety in many ways, and give you the greatest protection.
  • 【5 Working Modes】: Strong(100%)- medium(70%)-low(50%)- flash-SOS one key switch mode, simple and convenient. Power indicator always master the power of flashlight.Visibility up to 300 yards using different modes in different situation.
  • 【Waterproof & Durable】: IP65 waterproof,no worry in various extreme weathers. Heavy duty and full-size body,Aircraft aluminum, Not easy to heat up, resistant to fall, not easy to deform, no problem falling within 10 feet,sealed construction with black anodized finish, waterproof,rainproof, dustproof.
Bestseller No. 8
IMR 18500 1300mAh 3.7V High Drain LiMn Demonfire Rechargeable Battery with Button Top (2 Pieces)
  • These are size 18500 batteries. Please double check the size you need before purchasing. 18500 batteries have a diameter of 18mm (0.71 in.) and a length of 50mm (1.97 in.).
  • Long-lasting 1300 mAh Li-Mn rechargeable button top batteries with 16.5A amp limit. 18500 batteries are commonly used in solar landscape lighting.
  • Safe chemistry LiMn batteries with high thermal stability significantly reduces risk of explosion or bursting into flames when properly charged, used, and stored
  • No memory effect and can be recharged over 300 times when either partially or fully drained
  • Includes two dual battery storage cases to safely and securely store and protect your batteries. US based seller dedicated to the highest standards of quality and service.
Bestseller No. 9
LED 8000 Lumens Headlamp Flashlight ,with 6PCS 3.7V 9900mAh Rechargeable 18650 Battery + Batteries Charger,Waterproof 4 Modes Bright Headlight for Cycling Camping Running Fishing
  • High-Capacity Performance Lasting: This rechargeable High Capacity battery that can last up to 3~6 hours with a single charge.The battery is perfectly protected against heat and high temperature, allowing you to charge safely.
  • LONG-LASTING, POWER DISPLAY: Come with 6PCS 3.7V batteries headlamp, it can work 18~25 hours with fully charged at normal temperature.
  • 4 WORKING MODES: Whether you prefer to use the lowest, most focused setting,the wider and splashier medium and high modes, or the bright emergency-ready strobe light, this movable brightest LED head light is prepared to adjust to a full range of lighting needs.
  • ADJUSTABLE & LIGHTWEIGHT: Adjustable elastic headband compatible with all of people’s head size, soft elastic is comfortable to wear, lightweight enough for only 2.85oz
  • High Quality Smart Charger: It is with high efficiency and reliability! There is a free USB Charger included.When Charging,the warming light show red,Fully Charged,the light show Green.
SaleBestseller No. 10
Skywolfeye 2 Packs High 4000 Lumens 18650 Led Flashlight Torch with 4Pcs 3.7v High Capacity Rechargeable Battery&1Pcs 4 Bays Charger, Bright Adjustable Focus and 5 Modes for Camping Hiking
  • Include: 4 x 18650 rechargeable battery (lncluded),1X4-slot charger,2 X 18650 flashlight.
  • Brightness & Durability: High powered, high lumen LED chip delivers so much light for all purposes - both indoor and outdoor. Flashlight body made of aluminium alloy for durability and robustness.
  • Mode Arrangement: Hi > Mid >Lo > Strobe >SOS(With a slight press of the power button changes the operating mode.)
  • Waterproof & Non-Slip:Skid-proof design & waterproof design LED bulbs(not for diving), enough to adapt to most harsh environments.
  • Range: Sweeps bright light over the length of about two football fields ( 300 m) and reaches nearly 1000 ft. Fully zoomable from wide to narrow beam.

Factors You Should Consider Before Buying the 4000mah 18650 battery

As you already know, research is essential before making any purchase. So, there are some factors you should consider before starting your research. This is important so that you can make your entire buying process as hassle-free as possible.

Remember, your time has as much value as your money. So, there are a few things you should determine which will affect your research as well.

There are a few questions you should ask yourself to determine your course of research on the 4000mah 18650 battery:

  • Is this 4000mah 18650 battery serving the purpose of purchase? What are your expectations from the product?
  • What functions must the 4000mah 18650 battery have? Are there any specific functions that you are seeking in the product?
  • Is there a specific budget, or is the budget flexible?
  • Will the 4000mah 18650 battery require maintenance and upkeep costs?
  • Are you looking to buy the 4000mah 18650 battery online or offline? What will be the best places to purchase the product?
  • Where will you seek reliable information on the 4000mah 18650 battery?

Having multiple options from various brands can get confusing, so ask yourself these questions to narrow down your research.

Once you determine your expectations from the 4000mah 18650 battery and your price range, you decide which ones you must research. The research will help you determine the pros and cons. But before that, where will you get the reliable information to conduct your research?

Sources for Research

It’s 2021, and your best sources for information and research can be found online. Google 4000mah 18650 battery and you will find the best selling online marketplaces available. Visit any or each of them to learn about the specifications and prices given on your 4000mah 18650 battery.

You will be able to find the best deals out of all the options. You can also watch some YouTube videos on the product to see for yourself the functionality of the 4000mah 18650 battery.

Advantages of Buying Products from Online Sites

Online sites provide a variety of benefits that make your selection and buying process easier. Here are some of the advantages of buying products from online sites:

Best Prices

Reliable online sites give you the benefit of comparing prices and finding the best deals. Platforms like work with manufacturers directly to provide better deals. And the coupons and occasional discounts add to it.

There are no intermediaries in between to make the buying process easy. And the best part? No trouble of going to the shop.


Renowned online sites like Newegg, Amazon, Walmart have branches all over the country. Their transaction and delivery policies are reliable compared to other e-commerce platforms.

Huge Selection

More Variety – the best part about online shopping platforms. These sites give you access to a vast variety of options to choose from.

Suppose you go to Search 4000mah 18650 battery and up comes options of the product in different prices, brands, and specs. You get to browse these options from the comfort of your home and save time.

You can choose the one that fits your need from your preferred seller. Yes, online platforms even give you the option to choose your seller.


These online sites have numerous customer reviews of the products shown. So, you know which product is authentic and which seller is authorized. And for these facilities provided, they are trustworthy and credible.

Other additional benefits of shopping from online sites would be the facility of easy return and record of the purchase. Online sites are constantly making changes to make shopping easy and hassle-free from the comfort of our homes.

How to Select the 4000mah 18650 battery

Making your final decision can pose to be a challenge. But worry not. We have a few suggestions to make your selection process easier.

Before that, we would recommend you opt for sites like Amazon, Walmart, Newegg, and Best Buy for your purchase.

So the factors you should consider while selecting your 4000mah 18650 battery would be:


Hop on to any of these sites and search the options you have shortlisted. Then compare the prices and look for discounts. Don’t forget to factor in shipping charges as well.

Once you get the best favorable deal, you can opt for the 4000mah 18650 batteryto match your need.


Price and brand are somewhat interrelated. Usually, high-end brands charge more. But higher price does not mean a better choice.

So, opt for the brand that meets your need the best.


Factor in the functionality of the product as it is very crucial. Check if the specs meet your need. Consider buying the one that will last in the longer run.

Understand the 4000mah 18650 battery specs and functionality to determine its use for you.

Customer Reviews

As we mentioned before, online sites usually have a review section. This section is filled with customer feedbacks and even pictures of the product.

Browsing through these reviews is the smartest thing to do. These reviews allow you to comprehend how the product will work for you. You can even determine the pros and cons of these reviews.

Check the rating on the website to learn if the seller is delivering the 4000mah 18650 battery as expected by the other buyers.

Final Words

All these factors will contribute to choosing your best 4000mah 18650 battery that meets your expectations. So, use your time efficiently.

And that is all for the ultimate guide to buying the 4000mah 18650 battery. We hope you can make your purchase confidently. Happy Shopping!

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