https://www.aliexpress.us/item/3256...2!ct!US!6512530647!!1!0!&gatewayAdapt=glo2usa 50Ah 48V ECO-WORTHY Metal Case LiFePO4 Lithium Battery w/ Built-in 50A BMS (Orange) on sale for $271.06 - $40 when you apply promo code USDEAL40 at checkout = $231.06. Shipping is free.