EagleTac Protected 18650 3400 mAh Rechargeable 3.7V Li-Ion Battery

EagleTac Protected 18650 3400 mAh Rechargeable 3.7V Li-Ion Battery

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EagleTac Protected 18650 3400 mAh Rechargeable 3.7V Li-Ion Battery


Important Lithium Battery Information:

Domestic:  We cannot ship more than three loose rechargeable lithium ion batteries in one shipment via USPS.  Please keep this in mind when placing orders.  Any orders containing more than three loose lithium ion batteries must have Free Shipping or Fedex selected as the shipping method. 

International:  As of November 15, 2012, the USPS has changed their regulations to allow international shipments of lithium ion batteries, but the batteries MUST be installed in the product that they power, most likely a flashlight if you are buying from us.  Any international orders containing lithium ion batteries that will not fit in lights included in the order must be shipped via Fedex.  Orders that contain loose lithium ion batteries not installed in a flashlight with USPS shipping selected will be held while we contact you about shipping options.

Highest capacity available

These second generation 18650 cells offer the highest available energy storage capacity, especially under heavy loading condition. During discharge, our 18650 3100mah maintains high voltage and high capacity output for better product performance.

Please note that we cannot ship lithium batteries of any kind to an international address via USPS.  International orders containing only lithium batteries will be canceled and refunded.  International orders containing lithium batteries and other items will be held while we contact you for further information.  Contact us if you would like a quote for DHL or another form of shipping, but be aware that the cost is much higher than via USPS.

Only 68mm in height

We are the first to offer 3400mAh 18650 li-ion with only 68mm in height. That makes it highly compatible with all 18650 based flashlights in the market.

Button top design

The protruded button top design makes it work with any flashlight that incorporates hardware anti-reversed battery polarity protection. It also ensure conductivity when multiple batteries are used in serial.

World best and most reliable battery cells

These imported Japanese li-ion cells offer world-highest capacity. Each cell is fully tested and internal resistance balanced and sorted from the manufacturer (we also perform individual testing before and after packing, and before shipping out.)

Our 3400mAh+ battery cells outperform other Japanese and Korean leading battery manufacturers in terms of capacity, under-load voltage, consistency, and compatibility.

High capacity

Unlike other competitors, our 3400mAh+ cells give the highest capacitor, especially during heavy current loading. It is tested to yield 3400mAh at 0.2C of constant current discharge (see our own discharge testing below).

High voltage

High voltage underload is always preferred especially in single battery flashlight application for constant regulated output (check out our 2500mAh+ 18650 for even higher voltage underload).

High consistency

All cells are capacity and internal resistance balanced and sorted to ensure highly consistency within a production and shipping batch. This becomes important when multiple batteries are used in serial or parrallel.


  • Made in Japan battery cells
  • 304 Stainless steel button top
  • High current load of up to 5A
  • IC protected against short, over-discharge, over-charge
  • Measures only 68mm in height
  • Steel plate reinfocred bottom
  • Ultra high capacity and high voltage even under heavy loading


  • Voltage: Typical 3.7V (4.2V when fully charged)
  • Capacity: 3400mAh (discharged at 0.2C)
  • Dimensions: 18.6mm x 68mm (+/-0.1mm)
  • Weight: 50gram

Additional Information

Model Eagletac 18650 3400mah
SKU EGT-18650MAH3400
Manufacturer EagleTac
Video Review No


Customer Reviews 10 item(s)

Complete crap battery
Put this in my bedroom emergency flashlight, fully charged. After a year I decided it was time to run it down & charge it again.

Battery fails to take a charge.

Never dropped, never exposed to outside temperature swings.
Review by x / (Posted on 11/28/2014)
Long lasting!!... But don't drop your flashlight!!
These batteries last a very long time! I purchased a couple of them a year ago and they are still going!!! If you plan on using your flashlight pretty often, you definitely want to buy these. I use these for my Olight M3X triton, CR123s die out pretty quick, so choose wisely. However, do not drop your flashlight!!... I dropped my flashlight once and the tip on one of the batteries dented inward which makes charging difficult at times, but that was my fault! Overall, great product, a bit pricy, but I just purchased 2 more!!
Review by Gabriel / (Posted on 7/7/2014)
Good capacity, even better product
Just bought it and as of now I'm really liking it. Will update my review after using it for a couple of weeks.
Review by Saad / (Posted on 12/14/2013)
Excellant 18650 3400 mAh 3.7 Volt Battery
I have twelve of these that are used in a Nitecore TM-25 and Armytek Head Lamp. Performance has been great both in consistency and long discharge time between each of the twelve batteries used on both flashlight and headlamp which are used on a daily basis. These batteries are pricey, but you get what you paid for, a high quality product. These batteries are charged via Nitecore i4 Battery Charger, another high quality product.

I would highly recommend these batteries to my friends and co-workers.

Review by GARY / (Posted on 11/16/2013)
Nice batteries but careful with compatibility
shorter than most 18650 cells, seemingly good capacity. unfortunately these 3400mah cells have a rather small + dimple which is too small for the Zebralight S6330 contacts. The S6330 positive contact uses a ring, not a solid contact. The + dimple fits inside of the ring and does not make contact. The Eageltac 3100mah 18650 cells have a slightly larger + dimple and those function OK in the S6330.
Review by Greis / (Posted on 9/7/2013)
Great Product, Excellent Customer Service
I recently purchased the combo pack of 4 eagle tac 3400mAh batteries and the nitecore i4 charger. I received the package very quickly with free shipping of orders over $49.00. Upon opening my package i noticed that one of my batteries was leaking. I called Going Gear and they replaced the battery for me without any hassle. I called on a Saturday and i receive the new battery on Monday. I call that fast service.

I have been using the batteries in my Nitecore tm26 without any problems. They provide excellent run time. I like them so much that I am going to be ordering 4 more for other flashlights that I have.

Thanks Going Gear for being one of the last few companies that provide excellent customer service
Review by Jim / (Posted on 8/6/2013)
Best Rechargeable 18650 out at the moment
I bought 2 of these for my Eagletac D25LC2, one in the light, one on standby. Great setup. This battery was an upgrade for my AW 2600 mAH batteries that I have been using since 2010. Also a great battery. I use my Eagletac D25LC2 daily in a high cycle (on/off) short duration pattern. I have used this battery for a year and a half and have not seen any loss in performance. By the time my light drained the Eagletac 3400mAH battery, enough time passed that I forgot when I charged it last. Price is well worth it over lesser competitors.
Review by Dan / (Posted on 7/14/2013)
Top Quality
I use these in my TM11 and TK75. They have worked flawlessly in both. The extra mah capacity is nice to have in these high powered lights. Eagle Tac is my battery of choice. Maybe a little more expensive but you get what you pay for.
Review by Dale W / (Posted on 6/27/2013)
Highly rated and highly recommened 18650 battery
I wanted a high quality flashlight for search and rescue work, and sought the advice of professionals. It was recommened that I get a Thrunite TN30 and two sets (of three) Eagle Tac 18650 3400 mAh batteries. Yes they were a little pricey, but knowing that there are so many false battery claims, I felt confident in buying at goinggear, and getting the Eagle Tac batteries.

Those batteries (I have 8 of them) have never let me down.
Review by Poppy / (Posted on 5/26/2013)
Terrible battery
i put this in a klarus r11 ,it worked for a day or two then the top smashed down ,making the light switch through modes at random.this battery is not worth any money and no warranty ,im going to try the nitecore since it has a 12 month warranty.i guess im stuck with it ,so heres your bad review.
Review by brad / (Posted on 5/13/2013)