Samsung 40T 21700 30A Flat Top 4000mAh Battery - Genuine


$ 5.99
109 reviews

SKU: samsung40t

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Samsung 40T 21700 - Amazing capacity with high power.

One of the top performing Samsung 21700 size batteries, the Samsung 40T is an amazing battery which performs closely to the Samsung 30T in terms of overall power, while offering a superior 4000mAh of capacity. Free case with your purchase! 

You can view Mooch's testing here.

    We don't sell bogus batteries. When buying from LiionWholesale, you can rest assured that we only work with top tier manufacturers to bring you the best, most reliable, trustworthy batteries that will perform above and beyond your expectations. And we test every shipment to ensure consistent quality.

    Priced per battery, not per pair.

    Samsung 40T Datasheet/Specifications

    Samsung 40T 21700 4000mah Specifications:

    • Size: 21700
    • Approximate Diameter: 21.1mm (max)
    • Approximate Length: 70.4mm (max)
    • Brand: Samsung
    • Manufacturer Rated Capacity: 4000mAh
    • Manufacturer Rated Standard Discharge Capacity: 3900mAh
    • Manufacturer Rated Max Discharge Current: 30A
    • Nominal Voltage: 3.6V
    • Peak Voltage: 4.2V
    • Protected: NO
    • Style: Flat Top
    • Color: Purple
    • Origin: South Korea

    Batteries are sold individually.

    If your battery is damaged or defective on arrival (will not take its first charge, or has issues with its first cycle), please let us know within 14 days of receiving your order and we'll make it right. Please read our complete store policy on defective products here for more information and to see if you're eligible.

    Manufacturer ratings: Please see more information regarding manufacturer ratings here.

    Battery Warning

    Warning: Lithium ion batteries may explode or burn due to improper use. Using these batteries for purposes not intended by the manufacturer, including outside a battery pack and/or without a BMS, may cause severe injury and damage. We are not responsible for any injuries caused by lithium ion batteries - use at your own risk.

    All rechargeable batteries have inherent risks under any circumstance. Use caution with working with li-ion batteries (lithium-ion), LiPo (lithium ion polymer), and any rechargeable cells (together "rechargeable batteries"), as they have dangerous charging characteristics and are known to explode or burn if mishandled. A purchaser and user of rechargeable batteries should educate themselves on rechargeable batteries, especially as to charging, discharging, assembly, and storage. Learn more about proper storage and care for rechargeable batteries here. We are not responsible for any damage caused by the misuse or mishandling of rechargeable batteries.

    Here are a few tips:

    • Never completely discharge batteries (below 2.5V under load or 3V unloaded)
    • Charge fully (to 4.2V) before first use
    • Never charge batteries to 4.3V or above
    • Do not charge unattended
    • Do not store your li-ion batteries fully charged for an extended period of time (weeks or more)
    • If you must store your battery, only store in a case or individual box in a cool and dry place at approximately 3.6-3.7V
    • Use only high quality battery chargers
    • Do not expose to heat
    • Do not connect the positive contact to the negative contact without an appropriate load
    • Never exceed the battery's specifications
    • Never try to charge or discharge li-ion batteries with battery chargers that are not made for li-ion batteries
    • Always charge these batteries on and within fireproof material
    • Never leave rechargeable batteries in a recharging station unattended
    • Do not use any rechargeable battery or charger if any visible damage is present, or if known mishandling, accidental or otherwise, has occurred
    • Always store and transport rechargeable cells in a safe, non-conductive container (never keep a spare battery loose in a pocket, purse, etc. and always use protective cases)
    • Properly dispose of all battery cells and chargers in accordance with local laws and mandates (if you're unsure, contact your local municipality)
    • If a rechargeable battery overheats, hisses, or bulges, immediately quarantine the battery from any combustible materials - ideally, take the battery outside
    • If a rechargeable battery catches fire, the FAA recommends pouring water or soda on the battery and surrounding areas - ideally, use a foam extinguisher to quell the fire

    By purchasing this product, you agree that seller makes no warranties whatsoever with respect to the goods sold on this website, including any (a) warranty of merchantability or (b) warranty of fitness for a particular purpose, whether express or implied by law, course of dealing, course of performance, usage of trade or otherwise. Buyer acknolwledges that it has not relied upon any representation or warranty made by seller, or any other person on the seller's behalf. If purchasing for resale, buyer assumes all responsibility and agrees to forward all notifications and warnings to the purchaser.

    Customer Reviews
    4.9 Based on 109 Reviews
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    Filter Reviews:
    zachary w.
    United States United States
    I though i bought 18650

    I was planning on buying 18650 but got 21700 it was my fault for not looking but it came with a free flash light and that what i use them for and the flashlight and im happy with it so i kept the battery and ordered some 18650s with a free gift and it was the same flashlight so know i have two flashlights

    • What device/application do you use this with? For the free flashlight it came with
    Liion Wholesale Batteries Samsung 40T 21700 30A Flat Top 4000mAh Battery - Genuine Review
    Thomas R.
    United States United States
    Samsung 21700

    Great batteries for vaping, 1 last all day

    • What device/application do you use this with? Vandy vape jackaroo mod
    Liion Wholesale Batteries Samsung 40T 21700 30A Flat Top 4000mAh Battery - Genuine Review
    Dylan B.
    United States United States
    My favorite battery

    If you are looking for a little bit more power and life from a battery look no further these Samsung 2700 40T 4000 mAh batteries are my favorite batteries. I use them from my flashlights to my mechanical tube mods for cloud competition's.

    • What device/application do you use this with? Flashlights and vape devices
    Liion Wholesale Batteries Samsung 40T 21700 30A Flat Top 4000mAh Battery - Genuine Review
    Johnny D.
    United States United States

    Power in my hands

    • What device/application do you use this with? Rulerbreker
    Liion Wholesale Batteries Samsung 40T 21700 30A Flat Top 4000mAh Battery - Genuine Review
    Steve A.
    United States
    Samsung 21700

    This battery was the correct match for my device. I get a full day worth of vaping and still have 1-2 bars and the end of day. As compared to going thru 2 18650’s which my devise can also use.

    • What device/application do you use this with? SX Mini SL
    Liion Wholesale Batteries Samsung 40T 21700 30A Flat Top 4000mAh Battery - Genuine Review

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