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18650 4000mAh Lithium Rechargeable Battery 3.7V

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US $3.69
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Are you looking for a good lithium battery from the internet in your daily life? If you are sure you really need one, here we recommend you a fine product. This UltraFire 4000mAh Li-ion Battery is designed perfectly. We offer this UltraFire 4000mAh Li-ion Battery in order to meet customers' different needs. The UltraFire Battery is precisely engineered and rigorously tested for voltage, capacity, compatibility and safety, which exceeds original mobile battery specifications. Higher energy density and lower weight than other types UltraFire 18650 battery. Manufactured under ISO9001-2000 to assure quality. Battery tested based on International Electrotechnical Commission (IEC)standard to ensure capacity, quality and life time.
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UltraFire UltraFire 18650 4000mAh Lithium Rechargeable Battery 3.7V
USD$ 8.39
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  • Specifications:

    • Model: UltraFire 18650
    • Capacity: 4000mAh
    • Voltage: 3.7V
    • Dimension: 18.0 x 66mm/0.7 x 25.9in (Dia. X L)


    • Li-ion lithium battery
    • 4000mAh li-ion battery is higher energy density and lower weight than other types rechargeable battery
    • The integrated microchip prevents overcharging and lengthens battery life
    • Ultrafire 4000mAh li-ion battery is really practical
    • UltraFire 18650 battery is rechargeable with no memory effect
    • So please be quick to buy this good 3000mAh li-ion battery
    • Can be used in laser pointer, torch and other electronic products
    • Safe and environmental friendly
    • Life time is about 10 years
    • Over charge and discharge protection

    UltraFire UltraFire 18650 4000mAh Lithium Rechargeable Battery 3.7V

    • Can be used in laser pointer,Torch and other electronic products



    • Safe and environmental friendly

    UltraFire Battery


    • Over charge and discharge protection


    What is lithium-ion batteries?

    UltraFire 18650 4000mAh Li-ion Battery Flashligh

    Lithium-ion batteries (sometimes abbreviated Li-ion batteries) are a type of rechargeable battery in which a lithium ion moves between the anode and cathode. The lithium ion moves from the anode to the cathode during discharge and in reverse, from the cathode to the anode, when charging. Lithium-ion batteries can be formed into a wide variety of shapes and sizes so as to efficiently fill available space in the devices they power. They're generally much lighter than other types of rechargeable batteries of the same size. The electrodes of a lithium-ion battery are made of lightweight lithium and carbon. Lithium is also a highly reactive element, meaning that a lot of energy can be stored in its atomic bonds. This translates into a very high energy density for lithium-ion batteries. Plus there is no issue with the memory effect, like the nickel-cadium does. When a nickel-cadium battery is recharged before it discharges the majority of its power, it essentially "forgets" that it could fully discharge to begin with. This problem is termed the memory effect.

    What is lithium ion polymer rechargeable battery?

    It's a high energy density, 3.6V/3.7V battery that is not compatible with ordinary batteries, but is widely used in the portable equipment market. It uses lithium metallic oxide (LixCoO2, LiNiO2, LiMnO4) in its positive electrode (cathode) and carbon material (LiXC6) in its negative electrode (anode), with electrolyte LiPF6, LiAsF6 etc, and the Lithium ions inside the battery transfer between the positive electrode and the negative electrode during charge or discharge, namely Rocking Chair Batteries (RCB).

    UltraFire UltraFire 18650 4000mAh Lithium Rechargeable Battery 3.7V

    Lithium ion polymer rechargeable battery similar to the Lithium-ion but with a solid polymer as electrolyte. Some gelled conductive material is added to promote conductivity. It utilizes the latest technology to become available for consumer use in products such as portable computers, PDA, cellular phones, blue tooth, portable DVD and military electronics etc. Lithium-ion polymer batteries have high voltage per cell, and excellent energy on both a weight and volume basis. Additionally, they can be made in very thin and large footprint configurations. Lithium-ion polymer batteries use liquid Lithium-ion electrochemistry in a matrix of conductive polymers that eliminate free electrolyte within the cell. For operating effectively over a broad range of temperatures and conditions, Lithium-ion polymer batteries contain no metallic Lithium anodes.

    About Rechargeable Batteries


    • Function
    • Sometimes called a storage battery, a rechargeable battery consists of multiple cells. This enables the electrochemical reaction that powers the battery to be reversed. Using a charger, these batteries can be recharged many times. Rechargeable batteries are used in automobiles, consumer electronics, storage for solar arrays and electrical vehicles.
    • Types
    • The most common types of rechargeable batteries are lead-acid, nickel cadmium, alkaline, nickel metal hydride and lithium ion. Lithium ion batteries are considered the most advanced rechargeable battery type and are used in most contemporary consumer electronics.
    • Size
    • Rechargeable batteries come in many shapes and sizes from automobile lead-acid type batteries to laptop and small digital camera batteries. The size is determined by the type of technology used and the design of the device in which the battery will be placed.
    • Features
    • The main feature of a rechargeable battery is self-evident--it can be charged multiple times. Secondary features that differ depending on the type of battery include:
    • Self-Discharge: This effect occurs within the battery cells causing the battery to lose power over time even when not in use.
    • Memory Effect: An effect mostly witnessed in Nickel Cadmium batteries, the battery seems to lose its maximum energy capacity if charged multiple times without being fully discharged.
    • Energy-to-Mass Ratio: This refers to the energy density of the battery.
    • Currently, Lithium ion batteries are the best performing rechargeable batteries if considering the above features.
    • Considerations
    • Many people avoid rechargeable batteries when given a choice because of a perceived higher cost. When you consider that rechargeable batteries can be reused multiple times, the savings of using them as opposed to one use batteries becomes clear

     Package Included:

    • 1 x UltraFire Battery

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from (Croatia)

Bought this item on


06:34:08 11-07-2012
Good capacity, long life using time.

Price is extreamly high !!!! Actualy, i think comeone was made a mistake .This way to much for this battery. DD, U must find bether deal !

I use this for LedLamp, and is good for that .

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from (Paris,TN)

Bought this item on


Great battery for your T6 light
01:31:22 08-29-2012
Great quality and the black and gold look really cool. Voltage was full up when it arrived so I stuffed it in a 1200 light. The new toy is still going strong with lots of use.

Costs a little more than some other 16850 4000 MAh cells.

If you do not want a pile of batteries around, this Bud (OK battery) is for YOU. Pay a little more and get a GREAT product.

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