Has anyone purchased batteries from www.greenbikekit.com? I see this battery
https://www.greenbikekit.com/e-bike-lithium-battery/li-ion-lifepo4/48v/48v-dorado-reention-ebike-battery.html
Which is 48V, 24AH (Samsung INR 21700 50E), for $428, which seems unbelievably low.