another entrant to the portable LiFePO4 market
512Wh:
https://us.anker.com/collections/por...products/a1751
778Wh (can't tell the battery chemistry with this one)
https://us.anker.com/products/a1750?ref=yotpo_94
256Wh
https://us.anker.com/products/a1720?ref=yotpo_94
US only at the moment, but they're a good brand.