18650 Rechargeable Battery Flat top 3.7v Lithium Rechargeable Batteries for Headlamp, LED Flashlight, 2Pack

Excellent batteries, I'm using them for both my ecig-mods and a rechargable led flashlight and they work great, charge fast and hold their charge solid, mah seems accurate. Highly recommend

Good

Got these for a YLL Vape, the first 2 charges the batteries did not charge right and they did not hold charge for very long. the 3rd charge i left it on the charger well past then it said it was full and that seemed to work the batteries worked much better after the "over charging"

Good batteries

Work perfect and good battery life

I've had these for ~10 months and they have seen light usage over that time in a vaporizer. I can't recall the capacities I was measuring in the beginning but they did work great and I was happy with the performance after my original 8+ year old batteries were starting to show their age. Unfortunately in the past couple months the capacity has dropped off and today they are unusable as they won't take a charge. I expected much more life out of these.

It is a common habit of battery vendors to exaggerate their capacity, and this one is not exception. So I measured real capacity for those interested. The battery was charged to 4.19V, and then discharged to 2.8V with 1A constant current. The battery showed internal resistance of 28 mOhm (decent) and capacity of ~2000 (2040) mAh. It is reasonable for mainstream 18650 batteries. It is also convenient to compare the price per 1000mAh - this is not the best from available on Amazon, but not the worst either. Because the battery delivered 40% less power than advertised, it gets 3 stars only. Make your decision to buy yourself.

Excellent batteries perfect for my vape mod!!!