LCLEBM3.7V 3800mAh USB Rechargeable Lithium Battery for Button Top with 2 in 1 Charge Cable for Flashlights, Camera, Headlamps, Doorbells, RC Cars (2 Pack)

I got two of these batteries. They look nice and good build. The capacity is perfect, and they should last a long time. One problem ..they do not want to work. They are fully charged and when put inside the flash lite nothing happens. The thing is ,i have two more of the same batteries and they work fine, when installed in the flash light. I can not figure out the reason why this two do not work. So they are going back.So i change the light and now they work good. I like this batteries because they hold the charge and have high capacity. Will see how long they will last. Change my rating to 5 stars.

LCLEBM 3.7V 3800mAh USB Rechargeable Lithium Battery for Button TopFirst and foremost, not all 18650 batteries are the same. If your device is designed for flat top as opposed to button top batteries, these may not work. In addition, these are a little longer than a standard 18650 battery, so once again, they may or may not work in your device.These are kind of a niche item. If they work for your application, you'll love them.

I used this in a Flashlight. It is longer than the rechargeable battery it is to replace. Due to the spring contractorsin the flashlight, it still fits. It is very tight but does fit and works. I don't carry the charger with me for the rechargeable battery. This product makes it much easier, as I do carry a phone (usb c) charger with me for travel. The battery charge seems to last quite a while. Just as long or possibly longer than what I use to have.

These batteries are significantly longer than the typical 18650! They likely will NOT fit into the battery compartment(s) of the device(s) you're buying them for.

I charged these up and put one in my streamlight... It's not dead yet. Granted, it's been a couple of months and I guess I don't really use the light that much.I chose these because I tried the ones that you have to pull off a cover and plug it into your usb-a charger. I bought a 2 pack of those, shabby, both failed. I then exchanged them. The new 2 failed also. All 4 of them had low quality control. Bah.From when I opened these new ones, I felt they were going to be great! Right out of the package!So, so far so good! I'd buy again if I had to.

These aren't bad at all. The manufacturer doesn't lie about the capacity and the integral USB charging port is slick and works well. There's even a cleverly-hidden charging/full indicator LED.Ignore any idiots yelling "They're a scam, I measured less capacity than that!" Stated battery capacity is ALWAYS measured under absolutely optimized, temperature-regulated, low-load laboratory conditions and NOT a real-world use situation. If you get even 2/3rd or 3/4ths of the stated capacity, you're doing fine.

Do they work ? Yes…IF they will fit in your device. Be warned that these are longer than the 18650 batteries that I already have. I bought these for a laser pointer and they will not fit inside in the device with the cap on because they are to long. Fortunately they will fit in my flashlight so it’s not a complete loss. If you need a specific length 18650 battery then I recommend that you measure what you have before buying this one or any other. Apparently there isn’t a standard length for this particular model of battery.

These two batteries come in a nice sturdy plastic case and have a "Y" USB charging cable included so you can charge them both at the same time. The batteries have a tiny LED on top by the mini-USB port -- glows red until charged, then green. Unfortunately, the battery is longer than a standard 18650 (without the charge port). The built-in charging feature extends the length of the battery (about 70mm). Therefore, it doesn't fit in all devices. So be aware of the length specs before you buy these. 4-Stars because this info should be clearly stated in the description.