LAVAFOX 18650 3000mAh 40A 3.7V Rechargeable Lithium-ion Batteries with Smart Lithium Battery Charger , For Flashlight, Headlamps, search lamp ,High Drain Devices (2 Pack)

First off, they are slightly longer than a typical 18650 (at least that I've experienced) due to the positive end sticking out a little farther. I can deal with that, although they are a little too tight in my box, but that's not my real issue. I put them in after fully charging, and I received an error of "weak battery" and my screen started wigging out. I tried switching one out for another and turning them around, thinking maybe it's just one bad battery, but it was all of them. I am overall very disappointed in this product.

I’ve had MANY 18650 batteries over the years. This is slightly too long to fit into any vape. I’ve never actually ran into this issue before but the makers of this product did not get the sizing correct with the batteries. The charger works so if you have more batteries, you can use the charger.

The product description is wrong. These batteries are NOT 40A.

I love this....Its perfect and keeps my batteries charged....

Works great!

So far work great1

The cord/cord port is too large, it takes quite a bit of wiggling to get it to charge and can't touch it at all or I have to start all over. I wouldn't buy this again.

Good