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NERMAK

NERMAK 3.7V 3200mAh USB Rechargeable Lithium lon Battery for Flashlights, Headlamps, Bike Lights, Bluetooth Speaker Etc(2 Pack)

  • Based on 322 reviews
Condition: New
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Availability: In Stock.
Fulfilled by Amazon
Arrives Thursday, Jul 2
Order within 15 hours and 7 minutes
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Size: 3.7V 3200mAh-2 PACK


Features

  • Superior Performance:Built-in USB-C port, support C-C output, you can charge your cell phone and other devices in case of emergency, easy to charge with the included 2-in-1 USB cable, no need for an additional battery charger (does not support PD fast charging)
  • Widely Uses:NERMK 3.7V rechargeable batteries are suitable for flashlights(High-power flashlights are not suitable), headlamps, remote controls, microphones, radios, bike lights, bluetooth speakers, and other household devices.
  • Safe and Efficient: NERMAK 3.7V battery has built-in safety protection against overcharging, over-discharging, over-current and short-circuit, with 1500+ charging cycles for longer service life, making it an ideal replacement battery for high-frequency equipment.
  • Warm Note: 2* 3.7 Volt Replacement lithium ion battery,12 months warranty, If you have any question for our product, Contact us: click the "Ask a question" on our storefront or in "YOUR ORDER" options click the "contact seller"

Number of Batteries: 1 Lithium Ion batteries required. (included)


Brand: NERMAK


Battery Cell Composition: Lithium Ion


Battery Capacity: 3200 Milliamp Hours


Recommended Uses For Product: Flashlights


Number of Batteries: 1 Lithium Ion batteries required. (included)


Brand: NERMAK


Model Number: 18700


Model Name: 18700


Manufacturer: Huizhou Yu'an Technology Co., Ltd.


Built-In Media: 2*3.7V 3200mAh battery


Warranty Description: 1 year


Battery Capacity: 3200 Milliamp Hours


Voltage: 3.7 Volts


Reusability: Rechargeable


Amperage: 3200 Milliamps


Unit Count: 2.0 Count


Battery Weight: 2.2 Ounces


Item Dimensions: 2.85 x 0.75 x 0.75 inches


Antenna Location: Flashlights


Battery Cell Type: Lithium Ion


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Thursday, Jul 2

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
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  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Perfect for applications WHERE THEY FIT
Size: 3.7V 3200mAh-2 PACK
These batteries are excellent, but some reviewers don't understand that an 18650 that has a C-type charge port is NOT 65mm long. They are 70mm long. Be sure to know your application before you buy these because they won't fit in many flashlights and other items requiring a 65mm 18650.
Reviewed in the United States on May 22, 2026 by US GT40 Man
    • New in April, 14 2024 Dead October 8, 2024
Size: 3.7V 3200mAh-2 PACK
Battery just quit charging. No lights, or other response just dead. Trying to find how to invoke 12 month warranty, not having the best of luck. I was given a full refund after posting the above, not sure what happened with the batteries, but they have a happy customer for future needs.
Reviewed in the United States on October 15, 2024 by Steven Ramsey
    • Not worth the hassle
Size: 3.7V 3200mAh-2 PACK
Batteries work ok, been using these for my EDC light, swapping when they need charged, I charge these on average once a week at best. Today one of the batteries stopped working, I assumed it was dead so I put it on the charger, it charged, so I put it back in my light and turned it on, then off, then it would not turn back on. Swapped batteries and my light works fine. I definitely CANNOT recommend this brand. ... show more
Reviewed in the United States on January 13, 2026 by Mike
    • Worth the money
Size: 3.7V 3200mAh-2 PACK
The batteries are fine. I don’t find the charge lasts as long as the original battery that came with the flashlight but the price was good. It charges fairly quickly. I have no complaints
Reviewed in the United States on April 25, 2026 by gruvdog
    • Good battery but it's very long!
Size: 3.7V 3200mAh-2 PACK
These are good batteries but you need to be aware of their length. There is a very good chance it will be too long for your device. It will definitely not fit the devices that require a flat top battery. It is about a 1/4" longer that the average battery with the button on the positive end. Point being, measure your current battery before purchasing these. As long as it will fit your device, it should work well. It will work OK in high drain items such as a flashlight. The USB C connector makes it easier to charge. It will also charge the normal way as long as it will fit in your device or your charger. The won't fit any of my chargers. ... show more
Reviewed in the United States on December 4, 2025 by James
    • They are good quality
Size: 3.7V 3200mAh-2 PACK
Came fast. A little tricky plugging them in for charging. Overall work good
Reviewed in the United States on May 13, 2026 by Robert Cook
    • USB-C does work, both in and out
Size: 3.7V 3200mAh-2 PACK
I admit I was skeptical, but they do work as described. USB-C is both in and out. I tested it on an old phone and it does charge. Slowly, but it will charge it. Also charged them with a standard 110v charger for Lithium Ion batteries and they charged that way just fine.
Reviewed in the United States on March 31, 2026 by Sierra
    • Works
Size: 3.7V 3200mAh-2 PACK
Exactly what I needed~ Thanks!
Reviewed in the United States on May 29, 2026 by CeeDee M.

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