One of the most powerful, intelligent 18650s you can buy
September 8, 2014
When getting hooked on Nitecore flashlights, I did lots of research on the best 18650 rechargeable Li-ion battery. While there were some esoteric (read: more expensive) batteries with slightly better voltage fall-off characteristics, the best bang for the buck was the top-of-Nitecore's-line NL189. With 3400mAh and an integrated battery discharge/overcharge protection circuit, this is a very resilient, very powerful, and very safe battery for use in an EDC (Every Day Carry) flashlight.
Pros:* 3400mAh strong.
* Nitecore trusted name.
* Uses two high-power MOS-FEE current regulation modules for discharge/overcharge protection.
Cons:* This is a "fatty", being just a hair thicker than some other 18650s. Make sure it fits in your flashlight (FYI, it fits in all Nitecore flashlights).