18650 Rechargeable Battery Flat Top, 2 Pack 3.7 Volt Real Capacity 2500mAh Lithium Battery for LED Flashlight, Headlamp, Cameras, Toys, Surveillance Devices

This set of QOJH 18650 Rechargeable Batteries appear to have a good build quality, are reading close to their rated capacity, and are working great so far. I have several LED flashlights, headlamps, and other devices that use 18650 batteries , so I like to have spares ready to go. I'm happy with them, and would recommend them to others.

Had needed some new 18650 batteries for my flashlight as well as portable fan as the original batteries were no longer holding a charge. So far these batteries by OOJH are working well and far exceeds the original batteries that they replaced.Although these are rated at 2500mAh capacity, they do appear to be on the lower end of capacity when comparing to other sellers and at similar prices, however, I'm also aware many sellers don't always accurately report the full capacity but so far these OOJH branded ones have been working well and have brought new life into my flashligh and mini-fan.Please note that these batteries are the flathead top and not raised in the center like household batteries. Just an FYI as I'm aware some devices can only accommodate the flathead version like this set since the ones that have a raised center may cause fit issues on devices with tight tolerances. Overall, would still highly recommend this set of (2) 18650 batteries.

I'm using them in my vape device, they've been working well.

These batteries perform as expected in my 18650 flashlights, and seem to have good stamina, as is usual in lithium ion 18650 batteries.I don't have a way to test the actual output, but the voltage reads 4.13V, nicely above the nominal 3.7V rated.

This product is a set of four (4) Lithium-ion batteries. These batteries are the 18650-pattern batteries which means they are 18mm in diameter and they are 65mm long. These batteries are smaller in diameter than 26650-pattern batteries encountered in some consumer products with higher power needs. The 26650-pattern batteries are 26mm in diameter and 65mm long.The 18650-pattern battery supplied in this set has a 2,500mAh capacity and a 3.7-Volt nominal voltage. These are also a “Button-Top” variety of battery which means that the positive contact has a button or dimple sticking up on that end of the battery as is usually seen on disposable-type batteries. Button-Top batteries are usually used in battery holders that have the contacts specifically designed for their use.I ordered these batteries to replace several batteries in which I have been seeing declining capacity over time. Those batteries are used in several flashlights that I have and use routinely. I am hoping that this product will have much greater capacity than the batteries currently in use (and which are not marked with a capacity statement). These batteries have a very nice appearance, are very well constructed (as far as I can see), and do have a nominal voltage of 3.7-volts. If I have any issues after these batteries are put into use, I will update this review. That said, I am not expecting to have any issues with this product. The manufacturer says that these batteries are capable of 1500 charge cycles or more and they have electronic protections against over-charging, over-discharging, overheating, and against short circuit conditions. They should be fine in my application.

I use an 18650 Button Top battery in my favorite high-powered flashlight, and flat-top batteries won’t work in it. Since I use the flashlight so frequently, my original batteries had degraded quite a bit, so I needed replacements. That’s when I decided to buy this 4-Pack of 18650 Rechargeable Batteries.The packaging is simple and practical, with the batteries neatly stored in plastic wrap that helps prevent short circuits and makes storage easy. Each battery is a standard 18650 size with a button top, and the PVC casing is smooth and sturdy, with the labels clearly marked as 2500mAh and 3.7V. The weight feels just right, and they seem well-made.I tested them in my flashlight first. After charging them up, I used the flashlight for a 3-hour hike with it set to medium brightness. By the end, the battery still had about half charge left. The 2500mAh capacity is pretty solid and lasted about 20-30% longer than the 2000mAh batteries I used before. The button-top design fits perfectly in the flashlight, and there was no issue with contact or power interruptions.The other two batteries went into my solar garden lights. After charging them, they provided around 6-7 hours of low brightness each night. The discharge was steady, and when I used my standard 18650 charger (output 4.2V, 1A), each battery took about 3 hours to fully charge. During charging, the temperature stayed pretty stable, so I feel confident in their safety.

So far these batteries are performing well; I've been able to charge them on several different chargers without incident.