Could not find a datasheet for them..
Seems to live up to a ~5700mah capacity according to people testing them, but i cannot find a datasheet on these.
Some people noticed that there were spot welds broken off them etc; my best guess is that they're a newer generation of cell made for a certain manufacturer and haven't really hit public availability yet.
They may be pulls from some device or car.. IE lightly used.
Supposedly these are ~275whr/kg cells it's quite exciting that such things even exist out in the wild. C rate is probably garbage ( ~1C
) but it'd be just the ticket for building a >2kw-hr pack with to tour with.. or build a solar storage battery with
The fact is that M58T is quite new cell, but it is likely that more >5000 mAh cells in the 21700 format will appear very soon. Close to the mass market is BAK N21700CD 5300 mAh cell. http://www.bakpower.com/yybk_rlx_en.php
Not once you finish assembling a sack of lipsticks into a pack that can dependably bounce down the road at speed. The more cells you need, the more structure and packaging you need, the more you negate any Wh/kg advantage as you add points of failure.
Seems like a great cell for a dry herb vape or an EDC flashlight. It's about the right size for that job.
First of all for clarification, the cells supplied by Nkon are described on the body as M58 (without T) even though they are listed as M58T.
And secondly here is the cycle life data compared to the Vapcell F60. It can be seen that both models are suitable for practical use. Regarding the F60 results, it is fair to say that these are probably FEB cells, which have a prescribed discharge limit of 2.75 V, whereas I tortured them down to 2.5 V, hence the sudden death at 100% DoD.