Terrific news.
As for alternative sources, there are YouTube websites that have tested a great many 18650 cells and discovered that many Chinese-sourced cells are absolute junk, with actual ratings far below the claimed number. I seem to recall that LG, Sony, Panasonic are trusted brands, but they are expensive cells and have been counterfeited. Just now I see quality 3,500mAh protected cells going for $10, so just the cell cost for a Lectric battery pack could be $500+ (13 by 4 18650 cells). I would be very curious about a cheap "LG" battery...
EDIT: A small point, perhaps, but our two Lectric XP 2.0 st bikes bought last November came with the 10.4 Ah packs, so the larger packs are 35% larger, not 46%. Still, a substantial improvement and something I've been expecting--one of their main competitors (Rad) has been selling 14 Ah packs for some time. An inferior ebike at a substantially higher price, in my view.