toobadorz, I only buy from reputable sources like MTNelectronics, Illumn.com, imrbatteries, 18650batterystore.com. The biggest variation I’ve seen within the same batch is 3,375mah to 3,557mah from a sample size of 4 cells. Currently Illumn.com sells the BEST NCR18650GA batch I’ve ever seen and it ranged from 3,540 to 3,631. It is incredible and is definitely the highest capacity 18650 in existence. Your Vapcell 16340 tested at 660mah is pretty poor. The highest Acebeam 16340 550mah I measured was 657mah and it is a higher current cell. I see a much more noticeable difference in output when used in FET driver, so I stock up on both the Vapcell and Acebeam and use them depending on the the light.
Barkuti,
The Samsung 36g is rated as 3,600mah everywhere. Besides HKJ, no where online do I see it rated at 3,350mah
https://www.18650batterystore.com/18650-p/samsung-36g.htm
https://www.imrbatteries.com/samsung-36g-18650-3600mah-10a-battery/
https://www.walmart.com/ip/Samsung-INR-18650-36G-3600mAh-10A-Rechargeable-High-Drain-Flat-Top-Vape-Battery-2-Pack/607352346
Also, I’m not promoting the acceptance of manufacturers overrating their cells or accepting overly high variances. However, I tested between 100 to 200 cells and that is just what I see. I don’t expect perfect consistency because it is not realistic although it is not impossible as I’ve seen some pretty consistent cells. Here are the most consistent cells I’ve seen:
Shockli 5500mah and Vapcell 5500mah measured at 5991, 5971, 5948, 6001
Acebeam 21700 5100mah protected measured at 4992, 4922, 5008
Sony VTC6 3100mah (same batch from Illumn) measured at 3098, 3142, 3124, 3106, 3109, 3143, 3129, 3109
Keeppower VTC6 3100mah measured at 3056, 3080, 3073, 3043
Sony VTC6 3100mah (from Hakelite) measured at 3175, 3206, 3220, 3188
Molicel P26A 2600mah (first 2 from Vapcell, 2nd 2 from Illumn) measured at 2704, 2729, 2675, 2694