https://www.ebay.com/itm/3965872085...customid=c769029e53a211f0a73d3e160c4e98030INT ECO-WORTHY 48V (51.2V) 100Ah 3U Server Rack LiFePO4 Battery V2 (Certified - Refurbished) on sale for $799.99 - $120 with coupon code THINGSYOULOVE at checkout = $679.99. Shipping is free.