Seems like you're describing this product exactly: https://ebikes.ca/product-info/grin-products/ligo-batteries.html https://ebikes.ca/product-info/grin-product

Seems like you're describing this product exactly: https://ebikes.ca/product-info/grin-products/ligo-batteries.html https://ebikes.ca/product-info/grin-products/ligo-batteries.... By the way, the company that makes this, Grin Technologies, is really great. I've toured their facility and met the owner. (I don't have any sort of stake in them, though).