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· 【Size Parameters】3.7V 3200mAh lithium batteries, size: 18mm(0.7 inch) diameter x 70mm(2.7 inch), (Note: they are longer than the flat-top batteries, please check the battery size before purchasing) · 【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, headlamps, toys, 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"
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JvReviewed in the United States on February 6, 2025
I don know why but this batteries don’t last with a full charge. I use them on my headlamp Felix and they probably last about 5 to 6 house
LeslieReviewed in the United States on February 13, 2024
These batteries are easy to use and work with all of the correct usb charger they charge quickly and the battery has lasted a long time without recharging!
E. CornettReviewed in the United States on March 11, 2025
I needed these since my super $$$ machined aluminum flashlight wore down the battery from the company I got it from and they don’t make them anymore. Ah, well. This is better since it’s USB C rechargeable. I haven’t had it long enough to determine battery life or durability but since I don’t use that flashlight all that much I’m hoping the batteries last a long time.
PaulReviewed in the United States on March 31, 2025
After a month, it did not hold any charge
DustyReviewed in the United States on December 2, 2024
Chargers perfect and battery is a quality one. Slightly longer due to the charger but not enough to affect anything I have that uses this size
Steven RamseyReviewed in the United States on October 15, 2024
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.
JbReviewed in the United States on September 13, 2024
One battery work the other one is completely dead won't charge or do anything. I only need one. The one that works. It works really well.
Gyw0369Reviewed in the United States on May 29, 2024
Will replace Ring batteries