Post #9 of 9 about battery fakes. Please read post #1 (link below) before asking any questions here. Thanks!
http://www.tasteyourjuice.com/wordpress/archives/19048
The fakes have a much larger top contact and do not have the bottom vent ring and QR code box that genuine Murata 21700 VTC6A’s have. The fakes have a couple of characters stamped on the bottom. This is typical for Samsung, not Murata. The fakes have a narrower ring around the cell near the top but this will be hard to notice without a genuine Murata 21700 VTC6A for comparison.
Photos of the fakes and test results: https://imgur.com/a/OYt2PWW
The fakes performed terribly compared to genuine Murata 21700 VTC6A’s. The physical differences and the crappy performance versus genuine VTC6A’s means they are fakes. DO NOT USE THESE FAKES FOR ANYTHING!