Fake Murata 21700 VTC6A alert, post #9 of 9 about battery fakes

[Mooch]

Please read post #1 (link below) before asking any questions here. Thanks!

Eight different fake battery types to report!

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.



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!

 

[Derek Cross]

Whoa thanks Mooch. Appreciate the heads up.

Interesting little vent ring on the bottom there. Do a lot of cells use this and we just don’t notice? Only asking because some of the mechs I’m using can push the neg end in a bit and this would cause concern for me. I typically notice it and toss the cells. Mechanical mod cells are basically only used for 30 days and tossed anyway since they are getting the most abuse but if there is a vent ring on the bottom I’d have to double up my vigilance and make sure to maybe not use these in mechs altogether.

Thanks for this

 

[Mooch]

Whoa thanks Mooch. Appreciate the heads up.

Interesting little vent ring on the bottom there. Do a lot of cells use this and we just don’t notice? Only asking because some of the mechs I’m using can push the neg end in a bit and this would cause concern for me. I typically notice it and toss the cells. Mechanical mod cells are basically only used for 30 days and tossed anyway since they are getting the most abuse but if there is a vent ring on the bottom I’d have to double up my vigilance and make sure to maybe not use these in mechs altogether.

Thanks for this

The VTC5D and VTC6A use a bottom vent. A couple others too but I forget which.
Any cell with a bottom vent has become more of a concern for me if the mod might prevent the ring from opening properly in case of an accidental short-circuit or anything else that might force the cell into thermal runaway. I am posting my VTC5D retests soon and will be mentioning this.

Any denting, anywhere, is a bad thing though on any cell.

 

[Robin Becker]

So maybe this battery is a fiction? maybe invented by the Chinese, in order to fake it...