It's not much cheaper but you can get good deals on 18650 cells. It's not unheard of to find deals on genuine cells for as low as $1 a cell. https://www.youtub

It's not much cheaper but you can get good deals on 18650 cells. It's not unheard of to find deals on genuine cells for as low as $1 a cell. https://www.youtube.com/watch?v=Hpv4G6HY2Rs https://www.youtube.com/watch?v=Hpv4G6HY2Rs Then there's the option of buying lightly used battery packs like a single module from a Tesla. https://www.ebay.com/itm/Tesla-Smart-Lithium-Ion-Battery-18650-EV-Module-57-Volt-3kWh-SOLAR-POWERWALL-/252144461952 https://www.ebay.com/itm/Tesla-Smart-Lithium-Ion-Battery-186... That's $690 for 3kWh that is all assembled, tested, cooling is taken care of, BMS included, individually fused cells as well as a 100A fuse on the entire pack. That's not too shabby, slap an inverter and a charger on that pack and you've got yourself a somewhat decent diy powerwall for like $1100 bucks.