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Nitecore NL166 RCR123A / 16340 650mAh 3.7V Protected Lithium Ion (Li-ion) Button Top Battery - Blister Pack

Nitecore NL166 RCR123A / 16340 650mAh 3.7V Protected Lithium Ion (Li-ion) Button Top Battery - Blister Pack
Nitecore NL166 RCR123A / 16340 650mAh 3.7V Protected Lithium Ion (Li-ion) Button Top Battery - Blister Pack
Nitecore NL166 RCR123A / 16340 650mAh 3.7V Protected Lithium Ion (Li-ion) Button Top Battery - Blister Pack
Nitecore NL166 RCR123A / 16340 650mAh 3.7V Protected Lithium Ion (Li-ion) Button Top Battery - Blister Pack
Nitecore NL166 RCR123A / 16340 650mAh 3.7V Protected Lithium Ion (Li-ion) Button Top Battery - Blister Pack
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Nitecore NL166 RCR123A / 16340 650mAh 3.7V Protected Lithium Ion (Li-ion) Button Top Battery - Blister Pack
Nitecore NL166 RCR123A / 16340 650mAh 3.7V Protected Lithium Ion (Li-ion) Button Top Battery - Blister Pack
Nitecore NL166 RCR123A / 16340 650mAh 3.7V Protected Lithium Ion (Li-ion) Button Top Battery - Blister Pack
Nitecore NL166 RCR123A / 16340 650mAh 3.7V Protected Lithium Ion (Li-ion) Button Top Battery - Blister Pack
Nitecore NL166 RCR123A / 16340 650mAh 3.7V Protected Lithium Ion (Li-ion) Button Top Battery - Blister Pack
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Nitecore NL166 RCR123A

Rechargeable CR123A Battery

The Nitecore N166 RCR123A Battery is a highly capable Lithium-Ion battery designed specifically for high performance electronics. These powerful RCR123A batteries deliver an impressive 3.7 Volts of power and can hold a charge of up to 650 mAh, making them perfect for high drain devices such as LED flashlights, video game consoles, cameras, appliances, and more. The cells come standard with a high-performance protection circuit that provides overcharge and over-discharge protection, safeguarding themselves from possible internal damage that could lower their capacity, ensuring they last as long as possible. The NL166 is capable of being recharged more than 500 times, making it both cost effective and environmentally friendly.

Safety First

Just as impressive as the NL166's power is its sophisticated safe design. The RCR123A batteries are equipped with a nickel-plated S.S. protectors at both ends to provide high impact resistance, good electrical conductivity and oxidation resistance. To prevent abrasions and other external damage, the NL166 cells are coated with a durable metallic film, while its circuit board is coated with an ultra tough plastic. The cell's innovative anode is designed to resist high temperatures, while a micro-porous barrier within the battery protects its delicate internal components. The battery even features a specialized pressure relief valve that activates if the battery experiences a rapid temperature increase.


  • Built-in high-performance protection circuit prevents overcharging / over-discharging
  • Nickel-plated S.S. connectors on both ends for superior impact resistance, electrical conductivity, and oxidation resistance
  • Durable metallic film coating protects against abrasions and other external damage
  • Pressure relief valve activates in the event of rapid temperature increase


  • Battery Size: RCR123A (16340)
  • Battery Chemistry: Lithium Ion (Li-Ion)
  • Voltage: 3.7V
  • Capacity: 650 mAh
  • Max Charging Current: 650mA
  • Recommended Charging Current: 300 mA
  • Max Discharge Current: 4A
  • Estimated Charge Cycles: 500 cycles
  • Diameter: 0.65" (16.6mm)
  • Height: 1.37" (34.8mm)
  • Weight: 0.62 oz (17.8g)
Battery Size:16340
Battery Capacity (mAh):650
Battery Chemistry:Li-Ion
Battery Voltage:3.6 / 3.7
Battery Terminal Type:Button Top
Battery Shelf Life:3 Years
Packaging:Blister Pack
Warranty:Battery Junction 30-Day Warranty, Nitecore 1 Year Warranty
Return Policy:Battery Junction Return Policy
Product Weight:0.628oz
Product Dimensions:1.37" (L) x 0.654" (Diameter)
Country of Origin:CN
Associated Battery Sizes:17340, 2/3A, R123, RCR123, RCR123A
27 Reviews
59% (16)
26% (7)
7% (2)
0% (0)
7% (2)
85% Recommend this product (23 of 27 responses)
By John
, N. California
June 8, 2016
Great Battery
I would have rated the batteries a 5 star if they were just a little shorter. I got 8 of them for my Arlo-Netgear Wi-Fi cameras. I found that they are just a little longer in length than the standard batteries. They are a very tight fit in the Arlo's. Each battery was packed in a blister pack upon my receiving them. I put them on my Nitecore charger for a full charge, let them rest, and installed them the next day. So far all is good with the Arlo's. I'll see if I can update this review at the time when the batteries need recharged.
Pros650mAh Protected
ConsSlightly longer than the stock commerical batteries, making for a very tight fit.
By Phil
December 17, 2017
Great battery
Long lasting quality battery
By Chris
Denver, Colorado
November 23, 2017
Good premium 16340
Compared to other 16340, this one seems to perform better and maintain constant output when used in my weapon light. Great with used on Olight PL-2 Valkyrie
ProsConstant and reliable output
ConsA lil expensive
By Doug
August 23, 2017
Will not buy again
Bought 12 to try in cameras and only got 8 to charge right out of the box , the ones that did charge didn't last half as long as the regular batteries that are 1/5 the cost. Not worth it.
By Jon Phillips
June 17, 2017
A bit oversized.
Bought these for 5 Arlo security cameras. Some fit okay but others are so tight they will not fit into the the low tolerance camera slots. On one the battery cover tore when I removed it (from the tight fit) and I noticed it had a second labeled cover underneath so it was "double wrapped". This one doesn't really fit in anything including flashlights. The batteries work fine but I tried some Olights and they fit much better so will be switching over to them.
By Gary Rogers
St. Petersburg, Fl
June 6, 2017
Power when you need it.
My rechargeable battery usage is primarily for flashlights. Living in the lightning/hurricane capitol of the country necessitates that you have adequate batteries to power the lights you need to maneuver safely.
By Marty
Lubec, Maine
June 6, 2017
Powerful with each recharge , no longer have to buy these batteries
Conveniently rechargeable 123A batteries work flawlessly, will buy again
ProsExcellent buy all around
By Steven
March 21, 2017
Terrible, don't buy
I bought a bunch of these and less than half of them are holding the correct capacity and voltage after about 3 months of use and less than a dozen charge/discharge cycles.
ConsDoesn't hold charge or voltage
By DuWayne
K Town, MN
March 17, 2017
Think they will work well
Have not had a chance to use these batteries yet, still using the ones that came with the flashlight to wear our. I like the idea of not having to go to a store and buy new batteries every time the regular ones die out. Can't compline on the price.
By Bee2011
Newport Beach, CA
March 1, 2017
Nice quality
Works just as described, but don't buy it for the Olight S1R. The max turbo mode won't work.
ProsNice quality at a cheap price.
ConsThe max turbo mode won't work If used with my Olight S1R turbo.
By Terran
New England
February 14, 2017
One out of two dead after four uses
I bought two of these, and one of them died on approximately the 4th charge. It got quite hot, and when I took it off the charger it measured only 4.09 volts. I'm rather glad I caught it before it burned down my house. The other one is still great so far. When working, they provided adequate current to run an Olight S1 on high mode, which requires more than an amp. Although these cells supposedly have a 12 month warranty, it turns out to be worthless in practice. I wrote to the manufacturer, and they said I could either return it to the dealer (batteryjunction says they will accept returns only for the first 30 days) or ship it to them directly in China. It would cost more to ship it to China than it is worth, assuming I could find a carrier willing to ship defective lithium ion cells at any price. It's likely that I just got unlucky and yours will be fine. One can't conclude much statistically with a sample size of 2. Nonetheless my experience did not inspire confidence in their quality control.
ProsProvides high current Protection circuit cuts off when voltage gets low to avoid overdischarge
Cons50% failure rate in my sample Worthless warranty
By Trevor
Rosemount, MN
January 18, 2017
Good Battery
Yes they are $6 for one, but they seem to work well. I wish they they could pack a few more mAh into it for the price.
ProsWorks well
ConsThe Price
By Cheryl
Nashville, TN
January 4, 2017
Awesome batteries
After doing a ton of research on what rechargeable batteries would work with my Arlo camera system, I bought these. They have now been in my cameras for over 2 weeks and still show full charge. I could not be happier. I also bought the NiteCore D4 charger (bought from a different vendor) to charge them.
By OsoBuddy
Columbia, MD
November 21, 2016
Energy to spare
The battery must be charged when taken out of the blister pack. Holds charge for an extended period. Fits Arlo cameras.
By James Sims
York, pa
November 4, 2016
Great battery, a little long
This replaced a 123 battery, but note that they are .15" longer because of the protection board.
ProsGood replacement
ConsYou need to account for the length
By Ron
September 20, 2016
Just what I ordered
Came on time in a sealed blister pack. Opened them up and put them in the charger, and both took a full charge. Used for a small but high lumen flashlight. It is an exact replacement for the ones that came with it. Watch out for cheaper batteries that don't have the same maH rating.
ProsHigh output, rechargeable
By Ryan
Howell, MI
September 13, 2016
Cant have enough of these around. They really give my lights the best output and lasting strength.
By Ben
Edmonton, Canada
February 15, 2016
Great, no reservations, would buy again
Works great with the nitecore I2 charger. Charges relatively fast and drains slowly when not in use. Save money and environment with rechargeables!
By Dean
Wantagh, NY
December 16, 2015
Dead End
A good rechargable battery with a major issue. The battery does hold good power right to the end where at that time your flash light will just turn off because loss of sufficient power to run your 1000 lumin high drain light. Now....is this the batteries fault or is this the new Flashlights hitting the market today with the technology that keeps your light from dimming until the end...Do you really want that happening????
ProsA good battery rite to the end... I recommend for household use but have spares.
ConsDies at end of life. Pls read my full comment.
By Michael
Lincoln, NE
November 28, 2015
Great in my older torch
Have a very old, but still unique and useful torch (Striker VG) and was advised I might fry it if I used a newer, hotter 18650. Took a chance on two Nitecore RCR123As and they work great. Buying two more for my single 123A EDCs. This will make me all-rechargeable. I've found every Nitecore device I've purchased through Battery Junction to be first class.
ProsDurable cover. Takes and holds a strong charge.
By bruce
November 14, 2015
great battery
slightly different size than 123a
By craig
Newmanstown, PA
September 19, 2015
Great battery
With the cost of 123 batteries, buying these has saved me a ton of money and they work and seem to last longer then a non-rechargeable 123 battery.
ProsCost-saving over time; long-lasting
By David
Wichita, Ks
July 23, 2015
Nitecore RCR123A NL166
Nitecore makes some great reliable products, from rechargeable batteries to the lights they power. Nitecore batteries are my preference for quality and reliability.
By Jeff
Young Arizona
February 26, 2015
Is the light suitable for rechargeable batteries
I purchased the NITECORE RCR123A battery to be used in my Streamlite EDC light. When I installed the batteries in the light the light would not work. I then tried the batteries in my SureFire E2D LED defender light and they functioned fine. With a little more research I was told Streamlight and Surefire did not recommend rechargeable batteries for lights that do not initially come with rechargeable batteries. Installing rechargeable batteries in these lights will void the warranty. Be sure the light you are purchasing these batteries for is able to except rechargeable batteries.
ProsI have no input on the long Jevity or the runtime of these batteries.
ConsThey will not work in all whites.
By Joseph Farrell
Las Vegas
February 7, 2015
Great rechargeable battery
They are good quality rechargeable batteries. Work great with my flashlights and holographic sights!
By Rob
Phoenix, Arizona
January 8, 2015
Great batteries
Put these guys in my streamlight TRL-1 and they work perfectly and last long. Batteries also shipped fast and on schedule.
By Jose Haddock
Staten Island, NY
December 23, 2014
Nitecore products rule!
Received items in perfect condition and earlier than expected. Batteries work great, have lots of power and last quite awhile. Totally satisfied. Would recommend Nitecore products and Battery Junction as a vendor to anyone who will listen.
ProsTotally satisfied with Nitecore batteries.
ConsNo cons.
1 Question & 1 Answer
from CT asked:
May 28, 2015
Does this cell have any protection built in?
1 Answer
The NL166 RCR123A battery automatically protects against overcharge, over discharge and short-circuiting.
Customer Service
on May 28, 2015

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Nitecore NL166 RCR123A / 16340 650mAh 3.7V Protected Lithium Ion (Li-ion) Button Top Battery - Blister Pack

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