EagleTac Protected 18650 3100 mAh Rechargeable 3.7V Li-Ion Battery

EagleTac Protected 18650 3100 mAh Rechargeable 3.7V Li-Ion Battery

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EagleTac Protected 18650 3100 mAh Rechargeable 3.7V Li-Ion Battery


Important Lithium Battery Information:

Domestic:  We cannot ship more than three loose lithium or 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 3100mAh 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 3100mAh+ 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 3100mAh+ cells give the highest capacitor, especially during heavy current loading. It is tested to yield 3100mAh 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 2400mAh+ 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: 3100mAh (discharged at 0.2C)
  • Dimensions: 18.6mm x 68mm (+/-0.1mm)
  • Weight: 50gram

Additional Information

Model eagletac_18650_3100mah
SKU EGT-18650MAH3100
Manufacturer EagleTac
Video Review No


Customer Reviews 3 item(s)

Great performance so far, but outer skin (plastic shrink wrap) is splitting and peeling.
I have never used anything but these batteries, so I have nothing to compare them to. That said, everything seems to be great with the exception of the plastic outer skin on the batteries splitting and peeling. I'm not sure what is going on, but almost all of the batteries, somewhere around 20, are doing this. I use the Inetllicharger i4 for recharging, and I've been using my Niteye EYE-40 every night. All of the splitting and peeling starts at the Anode. It hasn't had any impact on function so far, but I'm concerned.
Review by Jacob / (Posted on 11/3/2012)
The finest quality and longest charge capacity
IMO, about the highest capacity and highest quality 18650 Li-Ion battery available. Eagle Tac uses Panasonic 3100mAh cells, made in Japan. Pricey but you will find the useable charge capacity to be far longer than comparable batteries.
Review by Lawrence / (Posted on 9/3/2012)
Best 18650 for the money
These batteries are excellent and I have no complaints at all, excellent runtime and seem to fit every 18650 light I have come across without any issues.
Review by Brett / (Posted on 8/19/2012)