2pcs 1￵￵8￵6￵50 Rechar￵ge￵abl￵e Batter￵￵y,Using The 18650 Rechargeable Battery Charger (Does not Include The 18650 Battery Charger) (2pcs Button Top Batter￵￵y)

Work great. So far are keeping charged.

Doesn’t hold a charge for very long.

The (BATTERIES) are absolutely fantastic. The (CHARGER), on the other hand “”NEEDS TO BE LOOKED AT””. The (CHANGER) which came my batteries, is “”JUNK””. I put the batteries in the charger and plugged it into wall outlet. After 24 hours, the (LIGHT DID NOT) change to show (FULLY CHARGED). I install the batteries in my head lamp and plugged it into to my wall outlet. (5 HOURS LATER), my head lamp was working great. My rating for (4 STARS) is due to (FAULTY CHARGER). Batteries did charge up and worked great. I do recommend batteries as “SUPER FANTASTIC”.

Good for battery powered travel fan…..replaced original batteries. I would guess fan will last through at least 2x sets of batteries.Always have to watch to see if a new fan with batteries is cheaper, but in this case, we have multiple fans so it’s worth it.

I just purchased these for my Nitecore SRT 7 1000 lumen flashlight, which came with a 3400mAh 3.7V 18650 li-ion of its own. I fully charged these with my 18650 charger. Half the time when I insert one of these batteries, the light doesn't even work. The other half, the light works, but it flickers, dims, and is at least moderately less bright. These might be suitable for some other task, but as a flashlight battery they are awful. The battery that came with the flashlight always works, at a consistent brightness, with zero flicker.

The 18650 battery is one of the most common rechargeable battery types. In fact, some cars use battery packs consisting of hundreds of these type batteries. This particular battery seems to be from a non-big name source, but worked well for me. In some devices, this type of battery may be easy to replace, just like in a flashlight. But sometimes device manufacturers solder a small control chip and circuitry directly onto one of the battery contacts. That was the case with my device. So I carefully de-soldered the circuitry from the old battery, and carefully soldered it onto the new battery. But I used a high quality temperature controlled soldering station, with a narrow tip. The trick is to heat only the tiny area you are soldering, without heating up the battery. It requires quick precise work with a high quality soldering station. Don’t try this unless you have the right skills and equipment. Use eye protection. It can be extremely dangerous, even fatal, if the battery gets hot from soldering.

Better battery then AAA for flashlights that can use 18650

Does hold a charge for very long. Would not recommend to family or friends.