Some photos of M58T samples from Nkon. It can be seen that cells were removed from modules, but the welds are nicely cleaned. An interesting feature is the use of a one-side busbar connection in that app, I guess laser was used for welding. The dark circle in the middle of the positive terminal is probably caused by the laser as some surface treatment.
Can you check the actual dimensions and post them here? Diameter, length, etc. Because according to the information from NKON and EVVA, it looks like this cell is a bit larger than the usual standard and I’m wondering if it will fit in some of my light where it was a tight fit.
The one possibility for why safety is an issue is that LG likely found a way to increase the thickness of the electrodes through an innovation internally, but without finding a way to offset the internal resistance loss of such a change.
That would mean the cell gets hotter, losing more cycles, and all of the usual stuff during charging, and they don’t want warranty claims because of that.
It looks like a very thin positive terminal that’s already bent/ pushed down near the lower left leg in the picture. Flat tops of many cells are not really designed to be abused and or dropped in flashlights even with springs in both ends.
Unfortunately, due to the declared larger dimensions D: 21.7 mm and H: 71 mm, the volumetric energy density is only 768 Wh/l and therefore the “magic” value of 800 Wh/l in cylindrical format still resists.