18650 Rechargeable Battery 3.7V 9900mah High Capacity Long-Lasting for Flashlight, Toys and Pathlight 241011-3S (Flat Top, 20 Pack)

I like these batteries. They don't hold the charge for very long when I vape. But they get the job done. However, I did spend a lot of money on these batteries and it turns out I had five cases full and the batteries weren't depressed for my 18650 mods. So I ended up having to give those batteries away. Other than that, I'm happy with the batteries. They just need to hold a longer charge

Here is a true to life side by side comparison. 1-1/2 year old 2500 mAh vs the new 9900(?) mAh battery. I purchased the 20 count battery pack thinking at least 5 or maybe 10 batteries would run close to 4000 mAh, but alas this proved to be wishful thinking. Included in my review is a side by side test result using identical test modules. I conducted several tests to arrive at an average. The average mAh across 10 of the 20 batteries purchased ended up at 1238 mAh. Full charge battery voltage readings, (and yes, I allowed a minimum of 6 hours for surface charge decay), ranged from 4.08v to 4.16v making the average of 20 batteries 4.106v. And then there was the ridiculous shipping delay, anyway. If you want to buy wise, don't buy these...

Batteries are really light weight, like dollar store batteries are. I think the 9900maAh claim is sketchy.