MF Tactical 5000mAh, 3.7V, 10A Ultra Capacity 21700 Rechargeable Li-Ion Protected Battery – ONLY  for use in 21700 powered flashlights

SKU: 1x21700-UC Category:


This is our most powerful and longest running Grade A 3.7V, 10A, 5000mAh MF Tactical brand 21700 Ultra Capacity rechargeable lithium ion battery with built-in protection circuit for high power LED flashlights.  

Please be very wary of low cost li-ion 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.

We have been retailers of li-ion batteries since we got started in the flashlight business.  After putting up with the spotty quality of the 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 rechargeable li-ion batteries, optimized for use in our 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 10A Ultra Capacity 21700 cell is a TRUE 5000 mAh battery that will outperform and outlast batteries claiming to have the same specs.  Hyped up capacity claims on labels is the game that many manufacturers are playing with the public, and we simply do not play that game. We hope you will know that the five dollar “5000mAh” batteries on eBay and Amazon are in fact “too good to be true.”

What sets these 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 and get the most out of your light. Now that we control the battery making process, we can insure that you get the highest quality battery at the lowest possible price.

Here are the specs:

  • High Quality/High Performance MF Tactical Brand Grade A 21700 Cell
  • Li-ion Rechargeable
  • Capacity: 5000mAh
  • Nominal Voltage: 3.7V
  • Recommended for optimal performance in MF Tactical flashlights with working current up to 10A.
  • 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:  2.75v
  • Maximum Charge Current: 1C 5000mA
  • Maximum Continuous Discharge Current: 10A
  • Impedance (at 1000 Hz.): ≤40 mΩ
  • Charging Temp : 0 – 45C
  • Discharging Temp : -20 ~ 60C
  • Weight: 2.5 oz


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