Also,
AliBaba claim they have LG Chem E63 Cells:
https://www.alibaba.com/product-detail/new-rechargeable-battery-chem-e63-for_62426011491.html
60AH Packs. These would be great, but no idea on authenticity. I asked them, they said they're genuine, no surprise there. But I can't find any direct source for these high capacity packs. If anything I would rather order genuine Chinese cells from LiitoKala for example that work rather than buy fake cells from AliBaba that claim they're LG, Samsung.