Charging time for Ultrafire 18650 6800 mAh battery

Rated Capacity Min 3200 mAh at 20C Capacity Min 3250 mAh at 25C Typ 3350 mAh at 25C

Scroll down to the various capacity tests. Plenty of cells that test well above 3000 ma-hr. However, none are even close to 6800 ma-hr. Also note that the Ultrafire BCR18650 "4000 ma-hr rated" cell is included in the testing showing the highest internal resistance of all the cells tested. Yech.

Better still, a good friend who thinks it's fun to build automated testers, and has tested several hundred cells. Given the amount of his life he spends doing epic day-night hikes (60-170km without stopping, and breaking speed records in his 60+yr age group) and his 40-year career designing, building and installing satellite ground station hardware, I tend to trust his measurements more than I'd trust a data sheet.

Clifford Heath.

All of these Chinese 18650 Ultrafire cells are fakes. The world record breaking capacity that Panasonic have managed to achieve in this size of Lithium cell, stands at 3600mAH. Genuine 18650s are more typically 1200 to 2200mAH.

The very first of these Ultrafire fakes started off several years ago with a capacity claim for 3600mAH, matching the industry leader and subsequent cons have simply kept inflating the capacity claims in the hope of enticing yet more technically clueless consumers into buying such fake goods.

There are plenty of youtube videos demonstrating the abysmal capacity, often fake cells with a much lower capacity and cheaper cell mounted inside with perhaps a bit of gravel to make up for the expected weight of a genuine article.

makes a good starting point for your youtube odyssey into the murky world of Chinese 18650 fakes. Enjoy!