(5 customer reviews)


MF Tactical brand 3400mAh, 3.7v, 3.5A Ultra Capacity 18650 Rechargeable Li-Ion Protected Battery

SKU: 1x18650-UC-3.5A Category:


This is our Grade A 3.7v, 3.5A, 3400mAh MF Tactical brand 18650 sized Ultra Capacity rechargeable lithium ion battery with built-in protection circuit that permits current draw up to 3.5a, as required by high power LED flashlights.  In our continuing mission to provide our customers with the very best, cutting edge, state-of-the-art LED flashlights and accessories, we now offer this Ultra Capacity 3400mAh 18650 battery, which provides high power storage and an astounding 30% increase in run time (as compared to our Extended Capacity cells) on all 18650 powered MF Tactical flashlights.

Please be very wary of low cost 18650 batteries being sold online and at some battery specialty stores, as most are selling Grade B cells (cells that under-perform manufacturer specs or have defects) or, even worse, Grade C cells (used, repackaged, salvaged and/or damaged cells).  The majority of all lithium ion batteries for sale are counterfeit, fake and potentially dangerous.  To be safe, only purchase Grade A batteries from reputable manufacturers.  MF Tactical sells only Grade A cells.

Many of the lower quality 18650 batteries’ protection circuit boards (PCBs) on the market do not permit a current draw of 3.5 amps.  As high end flashlights, particularly multi-battery flashlights, often need this higher current to operate reliably at the high end of their performance window, you can be assured that MF Tactical batteries will always meet the needs of our high performance tactical LED flashlights.

We have been resellers of li-ion batteries since we got started in the flashlight business.  After initially putting up with the spotty quality of the 18650 batteries available to us on the market, including duds and inconsistent performance from battery to battery, we decided that the old adage is right:  “If you want something done right, you gotta do it yourself!”  So we went to the manufacturer of the finest li-ion cells and worked with them to design and produce the best quality, highest performing 18650 rechargeable li-ion batteries, optimized for use in high power tactical LED flashlights.  That is how MF Tactical batteries got started and why our customers now get the most powerful, highest quality and most reliable batteries available to power their state-of-the art MF Tactical flashlight.

The MF Tactical 3.5A Ultra Capacity battery is a TRUE 3400 mAh battery that will outperform and outlast batteries claiming to be 4000 mAh or higher.  Hyped up capacity claims on labels is the game that many manufacturers are playing with the public, and we simply will not play that game.  Off market brand 18650 batteries claiming to be “4000mAh,” “5000mAh” or even higher are not and quite simply cannot technically be what they are claimed to be.  We have done our own testing, and we learned that nearly all of the 18650 batteries on the market are in fact falsely labeled, and most are in fact storing less than 2000mAh, regardless of the pretty labels!  We hope you will know that the five dollar “5000mAh” batteries on eBay and Amazon are “too good to be true.”

What sets 18650 li-ion batteries apart from standard household batteries, like AA and AAA, is voltage:  these are 3.7 volt batteries, which make your high tech LED flashlight run much brighter than you could ever expect with the ordinary 1.5 volts you get in a household batteries.  Do a comparison and you will see for yourself how these batteries are one of the secrets of how we are able to make MF Tactical flashlights so bright.

If you have read our web site or heard about us online, you know that we are flashlight freaks!  That’s why we have spent time researching the science of li-ion battery technology so that you can run your MF Tactical flashlight on the best possible battery to get the most out of your light.  Now that we control the battery making process, we can insure that you get the best possible battery at the lowest possible price.

Here are the specs:

  • High Quality/High Performance MF Tactical Brand Grade A Cell
  • Li-ion Rechargeable
  • Capacity: TRUE 3400mAh
  • Nominal Voltage: 3.7V
  • Recommended for optimal performance in MF Tactical flashlights with working current up to 3.5A.
  • Safe and environmental friendly.
  • Life span up to 10 years.
  • Built in over-charge and over-discharge protection.
  • Maximum Charge Voltage: 4.2v
  • Maximum Cut-off Voltage:  2.5v
  • Standard Charge Current:  1.625A
  • Maximum Continuous Discharge Current: 3.5A
  • Impedance (Max at 1000 Hz.): 90m ohm
  • Charging Temp : 0 – 45C

5 reviews for Ultra Capacity 3400mAh, 3.7v, 3.5A 18650 Li-ion Rechargeable Battery

  1. property maintenance (verified owner)

    Bought a set of 3 Ultras about 3 years ago and they still charge up like new after weekly recharge cycles. Their write-up on battery quality and scams is NOT BS. These are very much worth the $19 they charge since the $10 batteries on Amazon dont give the same run time and die after about a year.

  2. Ronald Simpson (verified owner)

    If you are shopping by price, you need to compare these to $20-$25 high quality batteries, not the $5 cheapies from Amazon.
    Have bought cheap batteries, including Nuon from Batteries Plus, and when you consider that they crap out in a few months, a high quality costs far less in the long run. Have an MF X-Ray, and my $10 Nuon batteries (which are only 2600 MAH)only worked for 30 secs before crapping out. My new 3400 MAH MF Ultra batteries for $19 each run it for 2-1/2 hrs! Buy quality and get good performance!

  3. Blair Doyle (verified owner)

    Bought one of the 3400 Ultra to replace a cheaper foreign battery. I’ve had it over a year now and the difference is enormous. The MF battery is much
    heavier than the cheapy, lasts way longer and enables the flashlight to put out more light. I highly recommend MF Tactical batteries.

  4. dannyjoeathome (verified owner)

    If you find better batteries, please let me know. I can’t!

  5. Steve Watson

    Ordered my set of 3 of the Ultra batteries for my powerstar on Thursday and they arrived on Saturday! Fit and finish is exxcellent, and they are clearly well made. They charged up overnight in my 4-slot charger, and I have been testing in the flashlight for the past hour and half. Very impressed so far. i have been waiting for MF to come out with 3400 batteries. There is so much crap out there on the market, its good to know that MF will always have the real deal. Will be investing in more of the Ultras for all of my MF lights.

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